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From: James Hilliard <james.hilliard1@gmail.com>
To: swupdate@googlegroups.com
Cc: James Hilliard <james.hilliard1@gmail.com>
Subject: [swupdate] [PATCH v8 1/3] mongoose: Update to version 7.6
Date: Thu, 17 Feb 2022 18:27:16 -0700
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This is the latest unmodified upstream mongoose 7.6 amalgamation.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
---
 mongoose/mongoose.c | 19627 +++++++++---------------------------------
 mongoose/mongoose.h |  6730 ++-------------
 2 files changed, 5016 insertions(+), 21341 deletions(-)

diff --git a/mongoose/mongoose.c b/mongoose/mongoose.c
index 03bfad3..d5b1dd9 100644
--- a/mongoose/mongoose.c
+++ b/mongoose/mongoose.c
@@ -1,16143 +1,4952 @@
-/*
- * Copyright (c) 2004-2013 Sergey Lyubka
- * Copyright (c) 2013-2020 Cesanta Software Limited
- * All rights reserved
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- * This software is dual-licensed: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation. For the terms of this
- * license, see <http://www.gnu.org/licenses/>.
- *
- * You are free to use this software under the terms of the GNU General
- * Public License, but WITHOUT ANY WARRANTY; without even the implied
- * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- *
- * Alternatively, you can license this software under a commercial
- * license, as set out in <https://www.cesanta.com/license>.
- */
+// Copyright (c) 2004-2013 Sergey Lyubka
+// Copyright (c) 2013-2021 Cesanta Software Limited
+// All rights reserved
+//
+// This software is dual-licensed: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation. For the terms of this
+// license, see http://www.gnu.org/licenses/
+//
+// You are free to use this software under the terms of the GNU General
+// Public License, but WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// Alternatively, you can license this software under a commercial
+// license, as set out in https://www.mongoose.ws/licensing/
 
 #include "mongoose.h"
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_internal.h"
-#endif
-
-#ifndef CS_MONGOOSE_SRC_INTERNAL_H_
-#define CS_MONGOOSE_SRC_INTERNAL_H_
 
-/* Amalgamated: #include "common/mg_mem.h" */
-
-#ifndef MBUF_REALLOC
-#define MBUF_REALLOC MG_REALLOC
+#ifdef MG_ENABLE_LINES
+#line 1 "src/base64.c"
 #endif
 
-#ifndef MBUF_FREE
-#define MBUF_FREE MG_FREE
-#endif
+#include <string.h>
 
-#define MG_SET_PTRPTR(_ptr, _v) \
-  do {                          \
-    if (_ptr) *(_ptr) = _v;     \
-  } while (0)
+static int mg_b64idx(int c) {
+  if (c < 26) {
+    return c + 'A';
+  } else if (c < 52) {
+    return c - 26 + 'a';
+  } else if (c < 62) {
+    return c - 52 + '0';
+  } else {
+    return c == 62 ? '+' : '/';
+  }
+}
+
+static int mg_b64rev(int c) {
+  if (c >= 'A' && c <= 'Z') {
+    return c - 'A';
+  } else if (c >= 'a' && c <= 'z') {
+    return c + 26 - 'a';
+  } else if (c >= '0' && c <= '9') {
+    return c + 52 - '0';
+  } else if (c == '+') {
+    return 62;
+  } else if (c == '/') {
+    return 63;
+  } else if (c == '=') {
+    return 64;
+  } else {
+    return -1;
+  }
+}
 
-#ifndef MG_INTERNAL
-#define MG_INTERNAL static
-#endif
+int mg_base64_update(unsigned char ch, char *to, int n) {
+  int rem = (n & 3) % 3;
+  if (rem == 0) {
+    to[n] = (char) mg_b64idx(ch >> 2);
+    to[++n] = (char) ((ch & 3) << 4);
+  } else if (rem == 1) {
+    to[n] = (char) mg_b64idx(to[n] | (ch >> 4));
+    to[++n] = (char) ((ch & 15) << 2);
+  } else {
+    to[n] = (char) mg_b64idx(to[n] | (ch >> 6));
+    to[++n] = (char) mg_b64idx(ch & 63);
+    n++;
+  }
+  return n;
+}
 
-#ifdef PICOTCP
-#define NO_LIBC
-#define MG_DISABLE_PFS
-#endif
+int mg_base64_final(char *to, int n) {
+  int saved = n;
+  // printf("---[%.*s]\n", n, to);
+  if (n & 3) n = mg_base64_update(0, to, n);
+  if ((saved & 3) == 2) n--;
+  // printf("    %d[%.*s]\n", n, n, to);
+  while (n & 3) to[n++] = '=';
+  to[n] = '\0';
+  return n;
+}
 
-/* Amalgamated: #include "common/cs_dbg.h" */
-/* Amalgamated: #include "mg_http.h" */
-/* Amalgamated: #include "mg_net.h" */
+int mg_base64_encode(const unsigned char *p, int n, char *to) {
+  int i, len = 0;
+  for (i = 0; i < n; i++) len = mg_base64_update(p[i], to, len);
+  len = mg_base64_final(to, len);
+  return len;
+}
 
-#ifndef MG_CTL_MSG_MESSAGE_SIZE
-#define MG_CTL_MSG_MESSAGE_SIZE 8192
-#endif
+int mg_base64_decode(const char *src, int n, char *dst) {
+  const char *end = src + n;
+  int len = 0;
+  while (src + 3 < end) {
+    int a = mg_b64rev(src[0]), b = mg_b64rev(src[1]), c = mg_b64rev(src[2]),
+        d = mg_b64rev(src[3]);
+    if (a == 64 || a < 0 || b == 64 || b < 0 || c < 0 || d < 0) return 0;
+    dst[len++] = (char) ((a << 2) | (b >> 4));
+    if (src[2] != '=') {
+      dst[len++] = (char) ((b << 4) | (c >> 2));
+      if (src[3] != '=') dst[len++] = (char) ((c << 6) | d);
+    }
+    src += 4;
+  }
+  dst[len] = '\0';
+  return len;
+}
 
-/* internals that need to be accessible in unit tests */
-MG_INTERNAL struct mg_connection *mg_do_connect(struct mg_connection *nc,
-                                                int proto,
-                                                union socket_address *sa);
-
-MG_INTERNAL int mg_parse_address(const char *str, union socket_address *sa,
-                                 int *proto, char *host, size_t host_len);
-MG_INTERNAL void mg_call(struct mg_connection *nc,
-                         mg_event_handler_t ev_handler, void *user_data, int ev,
-                         void *ev_data);
-void mg_forward(struct mg_connection *from, struct mg_connection *to);
-MG_INTERNAL void mg_add_conn(struct mg_mgr *mgr, struct mg_connection *c);
-MG_INTERNAL void mg_remove_conn(struct mg_connection *c);
-MG_INTERNAL struct mg_connection *mg_create_connection(
-    struct mg_mgr *mgr, mg_event_handler_t callback,
-    struct mg_add_sock_opts opts);
-#ifdef _WIN32
-/* Retur value is the same as for MultiByteToWideChar. */
-int to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len);
+#ifdef MG_ENABLE_LINES
+#line 1 "src/dns.c"
 #endif
 
-struct ctl_msg {
-  mg_event_handler_t callback;
-  char message[MG_CTL_MSG_MESSAGE_SIZE];
-};
-
-#if MG_ENABLE_MQTT
-struct mg_mqtt_message;
 
-#define MG_MQTT_ERROR_INCOMPLETE_MSG -1
-#define MG_MQTT_ERROR_MALFORMED_MSG -2
-
-MG_INTERNAL int parse_mqtt(struct mbuf *io, struct mg_mqtt_message *mm);
-#endif
 
-/* Forward declarations for testing. */
-extern void *(*test_malloc)(size_t size);
-extern void *(*test_calloc)(size_t count, size_t size);
 
-#ifndef MIN
-#define MIN(a, b) ((a) < (b) ? (a) : (b))
-#endif
 
-#if MG_ENABLE_HTTP
-struct mg_serve_http_opts;
 
-MG_INTERNAL struct mg_http_proto_data *mg_http_create_proto_data(
-    struct mg_connection *c);
 
-/*
- * Reassemble the content of the buffer (buf, blen) which should be
- * in the HTTP chunked encoding, by collapsing data chunks to the
- * beginning of the buffer.
- *
- * If chunks get reassembled, modify hm->body to point to the reassembled
- * body and fire MG_EV_HTTP_CHUNK event. If handler sets MG_F_DELETE_CHUNK
- * in nc->flags, delete reassembled body from the mbuf.
- *
- * Return reassembled body size.
- */
-MG_INTERNAL size_t mg_handle_chunked(struct mg_connection *nc,
-                                     struct http_message *hm, char *buf,
-                                     size_t blen);
-
-#if MG_ENABLE_FILESYSTEM
-MG_INTERNAL int mg_uri_to_local_path(struct http_message *hm,
-                                     const struct mg_serve_http_opts *opts,
-                                     char **local_path,
-                                     struct mg_str *remainder);
-MG_INTERNAL time_t mg_parse_date_string(const char *datetime);
-MG_INTERNAL int mg_is_not_modified(struct http_message *hm, cs_stat_t *st);
-#endif
-#if MG_ENABLE_HTTP_CGI
-MG_INTERNAL void mg_handle_cgi(struct mg_connection *nc, const char *prog,
-                               const struct mg_str *path_info,
-                               const struct http_message *hm,
-                               const struct mg_serve_http_opts *opts);
-struct mg_http_proto_data_cgi;
-MG_INTERNAL void mg_http_free_proto_data_cgi(struct mg_http_proto_data_cgi *d);
-#endif
-#if MG_ENABLE_HTTP_SSI
-MG_INTERNAL void mg_handle_ssi_request(struct mg_connection *nc,
-                                       struct http_message *hm,
-                                       const char *path,
-                                       const struct mg_serve_http_opts *opts);
-#endif
-#if MG_ENABLE_HTTP_WEBDAV
-MG_INTERNAL int mg_is_dav_request(const struct mg_str *s);
-MG_INTERNAL void mg_handle_propfind(struct mg_connection *nc, const char *path,
-                                    cs_stat_t *stp, struct http_message *hm,
-                                    struct mg_serve_http_opts *opts);
-MG_INTERNAL void mg_handle_lock(struct mg_connection *nc, const char *path);
-MG_INTERNAL void mg_handle_mkcol(struct mg_connection *nc, const char *path,
-                                 struct http_message *hm);
-MG_INTERNAL void mg_handle_move(struct mg_connection *c,
-                                const struct mg_serve_http_opts *opts,
-                                const char *path, struct http_message *hm);
-MG_INTERNAL void mg_handle_delete(struct mg_connection *nc,
-                                  const struct mg_serve_http_opts *opts,
-                                  const char *path);
-MG_INTERNAL void mg_handle_put(struct mg_connection *nc, const char *path,
-                               struct http_message *hm);
-#endif
-#if MG_ENABLE_HTTP_WEBSOCKET
-MG_INTERNAL void mg_ws_handler(struct mg_connection *nc, int ev,
-                               void *ev_data MG_UD_ARG(void *user_data));
-MG_INTERNAL void mg_ws_handshake(struct mg_connection *nc,
-                                 const struct mg_str *key,
-                                 struct http_message *);
-#endif
-#endif /* MG_ENABLE_HTTP */
+struct dns_data {
+  struct dns_data *next;
+  struct mg_connection *c;
+  int64_t expire;
+  uint16_t txnid;
+};
 
-MG_INTERNAL int mg_get_errno(void);
+static struct dns_data *s_reqs;  // Active DNS requests
 
-MG_INTERNAL void mg_close_conn(struct mg_connection *conn);
+static void mg_sendnsreq(struct mg_connection *, struct mg_str *, int,
+                         struct mg_dns *, bool);
 
-#if MG_ENABLE_SNTP
-MG_INTERNAL int mg_sntp_parse_reply(const char *buf, int len,
-                                    struct mg_sntp_message *msg);
-#endif
+static void mg_dns_free(struct dns_data *d) {
+  LIST_DELETE(struct dns_data, &s_reqs, d);
+  free(d);
+}
 
-#endif /* CS_MONGOOSE_SRC_INTERNAL_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/mg_mem.h"
-#endif
+void mg_resolve_cancel(struct mg_connection *c) {
+  struct dns_data *tmp, *d;
+  for (d = s_reqs; d != NULL; d = tmp) {
+    tmp = d->next;
+    if (d->c == c) mg_dns_free(d);
+  }
+}
 
-#ifndef CS_COMMON_MG_MEM_H_
-#define CS_COMMON_MG_MEM_H_
+static size_t mg_dns_parse_name_depth(const uint8_t *s, size_t len, size_t ofs,
+                                      char *to, size_t tolen, int depth) {
+  size_t i = 0, j = 0;
+  if (tolen > 0) to[0] = '\0';
+  if (depth > 5) return 0;
+  while (ofs + i + 1 < len) {
+    size_t n = s[ofs + i];
+    if (n == 0) {
+      i++;
+      break;
+    }
+    if (n & 0xc0) {
+      size_t ptr = (((n & 0x3f) << 8) | s[ofs + i + 1]);  // 12 is hdr len
+      if (ptr + 1 < len && (s[ptr] & 0xc0) == 0 &&
+          mg_dns_parse_name_depth(s, len, ptr, to, tolen, depth + 1) == 0)
+        return 0;
+      i += 2;
+      break;
+    }
+    if (ofs + i + n + 1 >= len) return 0;
+    if (j > 0) {
+      if (j < tolen) to[j] = '.';
+      j++;
+    }
+    if (j + n < tolen) memcpy(&to[j], &s[ofs + i + 1], n);
+    j += n;
+    i += n + 1;
+    if (j < tolen) to[j] = '\0';  // Zero-terminate this chunk
+  }
+  if (tolen > 0) to[tolen - 1] = '\0';  // Make sure make sure it is nul-term
+  return i;
+}
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+static size_t mg_dns_parse_name(const uint8_t *s, size_t n, size_t ofs,
+                                char *dst, size_t dstlen) {
+  return mg_dns_parse_name_depth(s, n, ofs, dst, dstlen, 0);
+}
 
-#ifndef MG_MALLOC
-#define MG_MALLOC malloc
-#endif
+size_t mg_dns_parse_rr(const uint8_t *buf, size_t len, size_t ofs,
+                       bool is_question, struct mg_dns_rr *rr) {
+  const uint8_t *s = buf + ofs, *e = &buf[len];
 
-#ifndef MG_CALLOC
-#define MG_CALLOC calloc
-#endif
+  memset(rr, 0, sizeof(*rr));
+  if (len < sizeof(struct mg_dns_header)) return 0;  // Too small
+  if (len > 512) return 0;  //  Too large, we don't expect that
+  if (s >= e) return 0;     //  Overflow
 
-#ifndef MG_REALLOC
-#define MG_REALLOC realloc
-#endif
+  if ((rr->nlen = (uint16_t) mg_dns_parse_name(buf, len, ofs, NULL, 0)) == 0)
+    return 0;
+  s += rr->nlen + 4;
+  if (s > e) return 0;
+  rr->atype = (uint16_t) (((uint16_t) s[-4] << 8) | s[-3]);
+  rr->aclass = (uint16_t) (((uint16_t) s[-2] << 8) | s[-1]);
+  if (is_question) return (size_t) (rr->nlen + 4);
+
+  s += 6;
+  if (s > e) return 0;
+  rr->alen = (uint16_t) (((uint16_t) s[-2] << 8) | s[-1]);
+  if (s + rr->alen > e) return 0;
+  return (size_t) (rr->nlen + rr->alen + 10);
+}
+
+bool mg_dns_parse(const uint8_t *buf, size_t len, struct mg_dns_message *dm) {
+  const struct mg_dns_header *h = (struct mg_dns_header *) buf;
+  struct mg_dns_rr rr;
+  size_t i, n, ofs = sizeof(*h);
+  memset(dm, 0, sizeof(*dm));
+
+  if (len < sizeof(*h)) return 0;                // Too small, headers dont fit
+  if (mg_ntohs(h->num_questions) > 1) return 0;  // Sanity
+  if (mg_ntohs(h->num_answers) > 10) return 0;   // Sanity
+  dm->txnid = mg_ntohs(h->txnid);
+
+  for (i = 0; i < mg_ntohs(h->num_questions); i++) {
+    if ((n = mg_dns_parse_rr(buf, len, ofs, true, &rr)) == 0) return false;
+    // LOG(LL_INFO, ("Q %zu %zu", ofs, n));
+    ofs += n;
+  }
+  for (i = 0; i < mg_ntohs(h->num_answers); i++) {
+    // LOG(LL_INFO, ("A -- %zu %zu %s", ofs, n, dm->name));
+    if ((n = mg_dns_parse_rr(buf, len, ofs, false, &rr)) == 0) return false;
+    mg_dns_parse_name(buf, len, ofs, dm->name, sizeof(dm->name));
+    ofs += n;
+
+    if (rr.alen == 4 && rr.atype == 1 && rr.aclass == 1) {
+      dm->addr.is_ip6 = false;
+      memcpy(&dm->addr.ip, &buf[ofs - 4], 4);
+      dm->resolved = true;
+      break;  // Return success
+    } else if (rr.alen == 16 && rr.atype == 28 && rr.aclass == 1) {
+      dm->addr.is_ip6 = true;
+      memcpy(&dm->addr.ip6, &buf[ofs - 16], 16);
+      dm->resolved = true;
+      break;  // Return success
+    }
+  }
+  return true;
+}
 
-#ifndef MG_FREE
-#define MG_FREE free
+static void dns_cb(struct mg_connection *c, int ev, void *ev_data,
+                   void *fn_data) {
+  struct dns_data *d, *tmp;
+  if (ev == MG_EV_POLL) {
+    int64_t now = *(int64_t *) ev_data;
+    for (d = s_reqs; d != NULL; d = tmp) {
+      tmp = d->next;
+      // LOG(LL_DEBUG, ("%lu %lu dns poll", d->expire, now));
+      if (now > d->expire) mg_error(d->c, "DNS timeout");
+    }
+  } else if (ev == MG_EV_READ) {
+    struct mg_dns_message dm;
+    int resolved = 0;
+    if (mg_dns_parse(c->recv.buf, c->recv.len, &dm) == false) {
+      char *s = mg_hexdump(c->recv.buf, c->recv.len);
+      LOG(LL_ERROR, ("Unexpected DNS response:\n%s\n", s));
+      free(s);
+    } else {
+      LOG(LL_VERBOSE_DEBUG, ("%s %d", dm.name, dm.resolved));
+      for (d = s_reqs; d != NULL; d = tmp) {
+        tmp = d->next;
+        // LOG(LL_INFO, ("d %p %hu %hu", d, d->txnid, dm.txnid));
+        if (dm.txnid != d->txnid) continue;
+        if (d->c->is_resolving) {
+          d->c->is_resolving = 0;
+          if (dm.resolved) {
+#if MG_ENABLE_LOG
+            char buf[100];
+#endif
+            dm.addr.port = d->c->peer.port;  // Save port
+            d->c->peer = dm.addr;            // Copy resolved address
+            LOG(LL_DEBUG, ("%lu %s resolved to %s", d->c->id, dm.name,
+                           mg_ntoa(&d->c->peer, buf, sizeof(buf))));
+            mg_connect_resolved(d->c);
+#if MG_ENABLE_IPV6
+          } else if (dm.addr.is_ip6 == false && dm.name[0] != '\0') {
+            struct mg_str x = mg_str(dm.name);
+            mg_sendnsreq(d->c, &x, c->mgr->dnstimeout, &c->mgr->dns6, true);
 #endif
-
-#ifdef __cplusplus
+          } else {
+            mg_error(d->c, "%s DNS lookup failed", dm.name);
+          }
+        } else {
+          LOG(LL_ERROR, ("%lu already resolved", d->c->id));
+        }
+        mg_dns_free(d);
+        resolved = 1;
+      }
+    }
+    if (!resolved) LOG(LL_ERROR, ("stray DNS reply"));
+    c->recv.len = 0;
+  } else if (ev == MG_EV_CLOSE) {
+    for (d = s_reqs; d != NULL; d = tmp) {
+      tmp = d->next;
+      mg_error(d->c, "DNS error");
+      mg_dns_free(d);
+    }
+  }
+  (void) fn_data;
+}
+
+static void mg_dns_send(struct mg_connection *c, const struct mg_str *name,
+                        uint16_t txnid, bool ipv6) {
+  struct {
+    struct mg_dns_header header;
+    uint8_t data[256];
+  } pkt;
+  size_t i, n;
+  memset(&pkt, 0, sizeof(pkt));
+  pkt.header.txnid = mg_htons(txnid);
+  pkt.header.flags = mg_htons(0x100);
+  pkt.header.num_questions = mg_htons(1);
+  for (i = n = 0; i < sizeof(pkt.data) - 5; i++) {
+    if (name->ptr[i] == '.' || i >= name->len) {
+      pkt.data[n] = (uint8_t) (i - n);
+      memcpy(&pkt.data[n + 1], name->ptr + n, i - n);
+      n = i + 1;
+    }
+    if (i >= name->len) break;
+  }
+  memcpy(&pkt.data[n], "\x00\x00\x01\x00\x01", 5);  // A query
+  n += 5;
+  if (ipv6) pkt.data[n - 3] = 0x1c;  // AAAA query
+  // memcpy(&pkt.data[n], "\xc0\x0c\x00\x1c\x00\x01", 6);  // AAAA query
+  // n += 6;
+  mg_send(c, &pkt, sizeof(pkt.header) + n);
+#if 0
+  // Immediately after A query, send AAAA query. Whatever reply comes first,
+  // we'll use it. Note: we cannot send two queries in a single packet.
+  // https://stackoverflow.com/questions/4082081/requesting-a-and-aaaa-records-in-single-dns-query
+  pkt.data[n - 3] = 0x1c;  // AAAA query
+  mg_send(c, &pkt, sizeof(pkt.header) + n);
+#endif
+}
+
+static void mg_sendnsreq(struct mg_connection *c, struct mg_str *name, int ms,
+                         struct mg_dns *dnsc, bool ipv6) {
+  struct dns_data *d = NULL;
+  if (dnsc->url == NULL) {
+    mg_error(c, "DNS server URL is NULL. Call mg_mgr_init()");
+  } else if (dnsc->c == NULL) {
+    dnsc->c = mg_connect(c->mgr, dnsc->url, NULL, NULL);
+    if (dnsc->c != NULL) {
+      dnsc->c->pfn = dns_cb;
+      // snprintf(dnsc->c->label, sizeof(dnsc->c->label), "%s", "DNS");
+      // dnsc->c->is_hexdumping = 1;
+    }
+  }
+  if (dnsc->c == NULL) {
+    mg_error(c, "resolver");
+  } else if ((d = (struct dns_data *) calloc(1, sizeof(*d))) == NULL) {
+    mg_error(c, "resolve OOM");
+  } else {
+#if MG_ENABLE_LOG
+    char buf[100];
+#endif
+    d->txnid = s_reqs ? (uint16_t) (s_reqs->txnid + 1) : 1;
+    d->next = s_reqs;
+    s_reqs = d;
+    d->expire = mg_millis() + (int64_t) ms;
+    d->c = c;
+    c->is_resolving = 1;
+    LOG(LL_VERBOSE_DEBUG,
+        ("%lu resolving %.*s @ %s, txnid %hu", c->id, (int) name->len,
+         name->ptr, mg_ntoa(&dnsc->c->peer, buf, sizeof(buf)), d->txnid));
+    mg_dns_send(dnsc->c, name, d->txnid, ipv6);
+  }
+}
+
+void mg_resolve(struct mg_connection *c, const char *url) {
+  struct mg_str host = mg_url_host(url);
+  c->peer.port = mg_htons(mg_url_port(url));
+  if (mg_aton(host, &c->peer)) {
+    // host is an IP address, do not fire name resolution
+    mg_connect_resolved(c);
+  } else {
+    // host is not an IP, send DNS resolution request
+    mg_sendnsreq(c, &host, c->mgr->dnstimeout, &c->mgr->dns4, false);
+  }
 }
-#endif
 
-#endif /* CS_COMMON_MG_MEM_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_base64.c"
+#ifdef MG_ENABLE_LINES
+#line 1 "src/event.c"
 #endif
 
-#ifndef EXCLUDE_COMMON
 
-/* Amalgamated: #include "common/cs_base64.h" */
-
-#include <string.h>
 
-/* Amalgamated: #include "common/cs_dbg.h" */
 
-/* ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/ */
 
-#define NUM_UPPERCASES ('Z' - 'A' + 1)
-#define NUM_LETTERS (NUM_UPPERCASES * 2)
-#define NUM_DIGITS ('9' - '0' + 1)
+void mg_call(struct mg_connection *c, int ev, void *ev_data) {
+  // Run user-defined handler first, in order to give it an ability
+  // to intercept processing (e.g. clean input buffer) before the
+  // protocol handler kicks in
+  if (c->fn != NULL) c->fn(c, ev, ev_data, c->fn_data);
+  if (c->pfn != NULL) c->pfn(c, ev, ev_data, c->pfn_data);
+}
 
-/*
- * Emit a base64 code char.
- *
- * Doesn't use memory, thus it's safe to use to safely dump memory in crashdumps
- */
-static void cs_base64_emit_code(struct cs_base64_ctx *ctx, int v) {
-  if (v < NUM_UPPERCASES) {
-    ctx->b64_putc(v + 'A', ctx->user_data);
-  } else if (v < (NUM_LETTERS)) {
-    ctx->b64_putc(v - NUM_UPPERCASES + 'a', ctx->user_data);
-  } else if (v < (NUM_LETTERS + NUM_DIGITS)) {
-    ctx->b64_putc(v - NUM_LETTERS + '0', ctx->user_data);
-  } else {
-    ctx->b64_putc(v - NUM_LETTERS - NUM_DIGITS == 0 ? '+' : '/',
-                  ctx->user_data);
-  }
+void mg_error(struct mg_connection *c, const char *fmt, ...) {
+  char mem[256], *buf = mem;
+  va_list ap;
+  va_start(ap, fmt);
+  mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+  LOG(LL_ERROR, ("%lu %s", c->id, buf));
+  c->is_closing = 1;             // Set is_closing before sending MG_EV_CALL
+  mg_call(c, MG_EV_ERROR, buf);  // Let user handler to override it
+  if (buf != mem) free(buf);
 }
 
-static void cs_base64_emit_chunk(struct cs_base64_ctx *ctx) {
-  int a, b, c;
+#ifdef MG_ENABLE_LINES
+#line 1 "src/fs.c"
+#endif
 
-  a = ctx->chunk[0];
-  b = ctx->chunk[1];
-  c = ctx->chunk[2];
 
-  cs_base64_emit_code(ctx, a >> 2);
-  cs_base64_emit_code(ctx, ((a & 3) << 4) | (b >> 4));
-  if (ctx->chunk_size > 1) {
-    cs_base64_emit_code(ctx, (b & 15) << 2 | (c >> 6));
-  }
-  if (ctx->chunk_size > 2) {
-    cs_base64_emit_code(ctx, c & 63);
+
+struct mg_fd *mg_fs_open(struct mg_fs *fs, const char *path, int flags) {
+  struct mg_fd *fd = (struct mg_fd *) calloc(1, sizeof(*fd));
+  if (fd != NULL) {
+    fd->fd = fs->open(path, flags);
+    fd->fs = fs;
+    if (fd->fd == NULL) {
+      free(fd);
+      fd = NULL;
+    }
   }
+  return fd;
 }
 
-void cs_base64_init(struct cs_base64_ctx *ctx, cs_base64_putc_t b64_putc,
-                    void *user_data) {
-  ctx->chunk_size = 0;
-  ctx->b64_putc = b64_putc;
-  ctx->user_data = user_data;
+void mg_fs_close(struct mg_fd *fd) {
+  if (fd != NULL) {
+    fd->fs->close(fd->fd);
+    free(fd);
+  }
 }
 
-void cs_base64_update(struct cs_base64_ctx *ctx, const char *str, size_t len) {
-  const unsigned char *src = (const unsigned char *) str;
-  size_t i;
-  for (i = 0; i < len; i++) {
-    ctx->chunk[ctx->chunk_size++] = src[i];
-    if (ctx->chunk_size == 3) {
-      cs_base64_emit_chunk(ctx);
-      ctx->chunk_size = 0;
+char *mg_file_read(struct mg_fs *fs, const char *path, size_t *sizep) {
+  struct mg_fd *fd;
+  char *data = NULL;
+  size_t size = 0;
+  fs->stat(path, &size, NULL);
+  if ((fd = mg_fs_open(fs, path, MG_FS_READ)) != NULL) {
+    data = (char *) calloc(1, size + 1);
+    if (data != NULL) {
+      if (fs->read(fd->fd, data, size) != size) {
+        free(data);
+        data = NULL;
+      } else {
+        data[size] = '\0';
+        if (sizep != NULL) *sizep = size;
+      }
     }
+    mg_fs_close(fd);
   }
+  return data;
 }
 
-void cs_base64_finish(struct cs_base64_ctx *ctx) {
-  if (ctx->chunk_size > 0) {
-    int i;
-    memset(&ctx->chunk[ctx->chunk_size], 0, 3 - ctx->chunk_size);
-    cs_base64_emit_chunk(ctx);
-    for (i = 0; i < (3 - ctx->chunk_size); i++) {
-      ctx->b64_putc('=', ctx->user_data);
+bool mg_file_write(struct mg_fs *fs, const char *path, const void *buf,
+                   size_t len) {
+  bool result = false;
+  struct mg_fd *fd;
+  char tmp[MG_PATH_MAX];
+  snprintf(tmp, sizeof(tmp), "%s..%d", path, rand());
+  if ((fd = mg_fs_open(fs, tmp, MG_FS_WRITE)) != NULL) {
+    result = fs->write(fd->fd, buf, len) == len;
+    mg_fs_close(fd);
+    if (result) {
+      fs->remove(path);
+      fs->rename(tmp, path);
+    } else {
+      fs->remove(tmp);
     }
   }
+  return result;
 }
 
-#define BASE64_ENCODE_BODY                                                \
-  static const char *b64 =                                                \
-      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; \
-  int i, j, a, b, c;                                                      \
-                                                                          \
-  for (i = j = 0; i < src_len; i += 3) {                                  \
-    a = src[i];                                                           \
-    b = i + 1 >= src_len ? 0 : src[i + 1];                                \
-    c = i + 2 >= src_len ? 0 : src[i + 2];                                \
-                                                                          \
-    BASE64_OUT(b64[a >> 2]);                                              \
-    BASE64_OUT(b64[((a & 3) << 4) | (b >> 4)]);                           \
-    if (i + 1 < src_len) {                                                \
-      BASE64_OUT(b64[(b & 15) << 2 | (c >> 6)]);                          \
-    }                                                                     \
-    if (i + 2 < src_len) {                                                \
-      BASE64_OUT(b64[c & 63]);                                            \
-    }                                                                     \
-  }                                                                       \
-                                                                          \
-  while (j % 4 != 0) {                                                    \
-    BASE64_OUT('=');                                                      \
-  }                                                                       \
-  BASE64_FLUSH()
-
-#define BASE64_OUT(ch) \
-  do {                 \
-    dst[j++] = (ch);   \
-  } while (0)
-
-#define BASE64_FLUSH() \
-  do {                 \
-    dst[j++] = '\0';   \
-  } while (0)
-
-void cs_base64_encode(const unsigned char *src, int src_len, char *dst) {
-  BASE64_ENCODE_BODY;
-}
-
-#undef BASE64_OUT
-#undef BASE64_FLUSH
-
-#if CS_ENABLE_STDIO
-#define BASE64_OUT(ch)      \
-  do {                      \
-    fprintf(f, "%c", (ch)); \
-    j++;                    \
-  } while (0)
-
-#define BASE64_FLUSH()
-
-void cs_fprint_base64(FILE *f, const unsigned char *src, int src_len) {
-  BASE64_ENCODE_BODY;
-}
-
-#undef BASE64_OUT
-#undef BASE64_FLUSH
-#endif /* CS_ENABLE_STDIO */
-
-/* Convert one byte of encoded base64 input stream to 6-bit chunk */
-static unsigned char from_b64(unsigned char ch) {
-  /* Inverse lookup map */
-  static const unsigned char tab[128] = {
-      255, 255, 255, 255,
-      255, 255, 255, 255, /*  0 */
-      255, 255, 255, 255,
-      255, 255, 255, 255, /*  8 */
-      255, 255, 255, 255,
-      255, 255, 255, 255, /*  16 */
-      255, 255, 255, 255,
-      255, 255, 255, 255, /*  24 */
-      255, 255, 255, 255,
-      255, 255, 255, 255, /*  32 */
-      255, 255, 255, 62,
-      255, 255, 255, 63, /*  40 */
-      52,  53,  54,  55,
-      56,  57,  58,  59, /*  48 */
-      60,  61,  255, 255,
-      255, 200, 255, 255, /*  56   '=' is 200, on index 61 */
-      255, 0,   1,   2,
-      3,   4,   5,   6, /*  64 */
-      7,   8,   9,   10,
-      11,  12,  13,  14, /*  72 */
-      15,  16,  17,  18,
-      19,  20,  21,  22, /*  80 */
-      23,  24,  25,  255,
-      255, 255, 255, 255, /*  88 */
-      255, 26,  27,  28,
-      29,  30,  31,  32, /*  96 */
-      33,  34,  35,  36,
-      37,  38,  39,  40, /*  104 */
-      41,  42,  43,  44,
-      45,  46,  47,  48, /*  112 */
-      49,  50,  51,  255,
-      255, 255, 255, 255, /*  120 */
-  };
-  return tab[ch & 127];
-}
-
-int cs_base64_decode(const unsigned char *s, int len, char *dst, int *dec_len) {
-  unsigned char a, b, c, d;
-  int orig_len = len;
-  char *orig_dst = dst;
-  while (len >= 4 && (a = from_b64(s[0])) != 255 &&
-         (b = from_b64(s[1])) != 255 && (c = from_b64(s[2])) != 255 &&
-         (d = from_b64(s[3])) != 255) {
-    s += 4;
-    len -= 4;
-    if (a == 200 || b == 200) break; /* '=' can't be there */
-    *dst++ = a << 2 | b >> 4;
-    if (c == 200) break;
-    *dst++ = b << 4 | c >> 2;
-    if (d == 200) break;
-    *dst++ = c << 6 | d;
-  }
-  *dst = 0;
-  if (dec_len != NULL) *dec_len = (dst - orig_dst);
-  return orig_len - len;
-}
-
-#endif /* EXCLUDE_COMMON */
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_dbg.h"
-#endif
-
-#ifndef CS_COMMON_CS_DBG_H_
-#define CS_COMMON_CS_DBG_H_
-
-/* Amalgamated: #include "common/platform.h" */
-
-#if CS_ENABLE_STDIO
-#include <stdio.h>
-#endif
-
-#ifndef CS_ENABLE_DEBUG
-#define CS_ENABLE_DEBUG 0
-#endif
-
-#ifndef CS_LOG_PREFIX_LEN
-#define CS_LOG_PREFIX_LEN 24
-#endif
+bool mg_file_printf(struct mg_fs *fs, const char *path, const char *fmt, ...) {
+  char tmp[256], *buf = tmp;
+  bool result;
+  int len;
+  va_list ap;
+  va_start(ap, fmt);
+  len = mg_vasprintf(&buf, sizeof(tmp), fmt, ap);
+  va_end(ap);
+  result = mg_file_write(fs, path, buf, len > 0 ? (size_t) len : 0);
+  if (buf != tmp) free(buf);
+  return result;
+}
 
-#ifndef CS_LOG_ENABLE_TS_DIFF
-#define CS_LOG_ENABLE_TS_DIFF 0
+#ifdef MG_ENABLE_LINES
+#line 1 "src/fs_fat.c"
 #endif
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/*
- * Log level; `LL_INFO` is the default. Use `cs_log_set_level()` to change it.
- */
-enum cs_log_level {
-  LL_NONE = -1,
-  LL_ERROR = 0,
-  LL_WARN = 1,
-  LL_INFO = 2,
-  LL_DEBUG = 3,
-  LL_VERBOSE_DEBUG = 4,
-
-  _LL_MIN = -2,
-  _LL_MAX = 5,
-};
-
-/*
- * Set max log level to print; messages with the level above the given one will
- * not be printed.
- */
-void cs_log_set_level(enum cs_log_level level);
-
-/*
- * A comma-separated set of prefix=level.
- * prefix is matched against the log prefix exactly as printed, including line
- * number, but partial match is ok. Check stops on first matching entry.
- * If nothing matches, default level is used.
- *
- * Examples:
- *   main.c:=4 - everything from main C at verbose debug level.
- *   mongoose.c=1,mjs.c=1,=4 - everything at verbose debug except mg_* and mjs_*
- *
- */
-void cs_log_set_file_level(const char *file_level);
-
-/*
- * Helper function which prints message prefix with the given `level`.
- * If message should be printed (according to the current log level
- * and filter), prints the prefix and returns 1, otherwise returns 0.
- *
- * Clients should typically just use `LOG()` macro.
- */
-int cs_log_print_prefix(enum cs_log_level level, const char *fname, int line);
-
-extern enum cs_log_level cs_log_level;
-
-#if CS_ENABLE_STDIO
-
-/*
- * Set file to write logs into. If `NULL`, logs go to `stderr`.
- */
-void cs_log_set_file(FILE *file);
-
-/*
- * Prints log to the current log file, appends "\n" in the end and flushes the
- * stream.
- */
-void cs_log_printf(const char *fmt, ...) PRINTF_LIKE(1, 2);
-
-#if CS_ENABLE_STDIO
 
-/*
- * Format and print message `x` with the given level `l`. Example:
- *
- * ```c
- * LOG(LL_INFO, ("my info message: %d", 123));
- * LOG(LL_DEBUG, ("my debug message: %d", 123));
- * ```
- */
-#define LOG(l, x)                                     \
-  do {                                                \
-    if (cs_log_print_prefix(l, __FILE__, __LINE__)) { \
-      cs_log_printf x;                                \
-    }                                                 \
-  } while (0)
-
-#else
+#if MG_ENABLE_FATFS
+#include <ff.h>
 
-#define LOG(l, x) ((void) l)
-
-#endif
+static int ff_stat(const char *path, size_t *size, time_t *mtime) {
+  FILINFO fi;
+  if (path[0] == '\0' || strcmp(path, MG_FATFS_ROOT) == 0) {
+    if (size) *size = 0;
+    if (mtime) *mtime = 0;
+    return MG_FS_DIR;
+  } else if (f_stat(path, &fi) == 0) {
+    if (size) *size = (size_t) fi.fsize;
+    if (mtime) *mtime = (fi.fdate << 16) | fi.ftime;
+    return MG_FS_READ | MG_FS_WRITE | ((fi.fattrib & AM_DIR) ? MG_FS_DIR : 0);
+  } else {
+    return 0;
+  }
+}
 
-#ifndef CS_NDEBUG
+static void ff_list(const char *dir, void (*fn)(const char *, void *),
+                    void *userdata) {
+  DIR d;
+  FILINFO fi;
+  if (f_opendir(&d, dir) == FR_OK) {
+    while (f_readdir(&d, &fi) == FR_OK && fi.fname[0] != '\0') {
+      if (!strcmp(fi.fname, ".") || !strcmp(fi.fname, "..")) continue;
+      fn(fi.fname, userdata);
+    }
+    f_closedir(&d);
+  }
+}
 
-/*
- * Shortcut for `LOG(LL_VERBOSE_DEBUG, (...))`
- */
-#define DBG(x) LOG(LL_VERBOSE_DEBUG, x)
+static void *ff_open(const char *path, int flags) {
+  FIL f;
+  unsigned char mode =
+      flags == MG_FS_READ ? FA_READ : FA_READ | FA_WRITE | FA_OPEN_APPEND;
+  if (f_open(&f, path, mode) == 0) {
+    FIL *fp = calloc(1, sizeof(*fp));
+    *fp = f;
+    return fp;
+  } else {
+    return NULL;
+  }
+}
 
-#else /* NDEBUG */
+static void ff_close(void *fp) {
+  if (fp != NULL) {
+    f_close((FIL *) fp);
+    free(fp);
+  }
+}
 
-#define DBG(x)
+static size_t ff_read(void *fp, void *buf, size_t len) {
+  unsigned n = 0;
+  f_read((FIL *) fp, buf, len, &n);
+  return n;
+}
 
-#endif
+static size_t ff_write(void *fp, const void *buf, size_t len) {
+  unsigned n, sum = 0, bs = MG_FATFS_BSIZE;
+  while ((size_t) sum < len &&
+         f_write((FIL *) fp, (char *) buf + sum,
+                 sum + bs > len ? len - sum : bs, &n) == FR_OK &&
+         n > 0) {
+    sum += n;
+  }
+  return sum;
+}
 
-#else /* CS_ENABLE_STDIO */
+static size_t ff_seek(void *fp, size_t offset) {
+  f_lseek((FIL *) fp, offset);
+  return offset;
+}
 
-#define LOG(l, x)
-#define DBG(x)
+static bool ff_rename(const char *from, const char *to) {
+  return f_rename(from, to) == FR_OK;
+}
 
-#endif
+static bool ff_remove(const char *path) {
+  return f_unlink(path) == FR_OK;
+}
 
-#ifdef __cplusplus
+static bool ff_mkdir(const char *path) {
+  return f_mkdir(path) == FR_OK;
 }
-#endif /* __cplusplus */
 
-#endif /* CS_COMMON_CS_DBG_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_dbg.c"
+struct mg_fs mg_fs_fat = {ff_stat,  ff_list, ff_open,   ff_close,  ff_read,
+                          ff_write, ff_seek, ff_rename, ff_remove, ff_mkdir};
 #endif
 
-/* Amalgamated: #include "common/cs_dbg.h" */
-
-#include <stdarg.h>
-#include <stdio.h>
-#include <string.h>
-
-/* Amalgamated: #include "common/cs_time.h" */
-/* Amalgamated: #include "common/str_util.h" */
-
-enum cs_log_level cs_log_level WEAK =
-#if CS_ENABLE_DEBUG
-    LL_VERBOSE_DEBUG;
-#else
-    LL_ERROR;
+#ifdef MG_ENABLE_LINES
+#line 1 "src/fs_packed.c"
 #endif
 
-#if CS_ENABLE_STDIO
-static char *s_file_level = NULL;
 
-void cs_log_set_file_level(const char *file_level) WEAK;
-
-FILE *cs_log_file WEAK = NULL;
+struct packed_file {
+  const char *data;
+  size_t size;
+  size_t pos;
+};
 
-#if CS_LOG_ENABLE_TS_DIFF
-double cs_log_ts WEAK;
+const char *mg_unpack(const char *path, size_t *size, time_t *mtime);
+const char *mg_unlist(size_t no);
+#if MG_ENABLE_PACKED_FS
+#else
+const char *mg_unpack(const char *path, size_t *size, time_t *mtime) {
+  (void) path, (void) size, (void) mtime;
+  return NULL;
+}
+const char *mg_unlist(size_t no) {
+  (void) no;
+  return NULL;
+}
 #endif
 
-enum cs_log_level cs_log_cur_msg_level WEAK = LL_NONE;
-
-void cs_log_set_file_level(const char *file_level) {
-  char *fl = s_file_level;
-  if (file_level != NULL) {
-    s_file_level = strdup(file_level);
-  } else {
-    s_file_level = NULL;
-  }
-  free(fl);
+static int is_dir_prefix(const char *prefix, size_t n, const char *path) {
+  return n < strlen(path) && memcmp(prefix, path, n) == 0 && path[n] == '/';
+  //(n == 0 || path[n] == MG_DIRSEP);
 }
 
-int cs_log_print_prefix(enum cs_log_level level, const char *file, int ln) WEAK;
-int cs_log_print_prefix(enum cs_log_level level, const char *file, int ln) {
-  char prefix[CS_LOG_PREFIX_LEN], *q;
+static int packed_stat(const char *path, size_t *size, time_t *mtime) {
   const char *p;
-  size_t fl = 0, ll = 0, pl = 0;
-
-  if (level > cs_log_level && s_file_level == NULL) return 0;
-
-  p = file + strlen(file);
-
-  while (p != file) {
-    const char c = *(p - 1);
-    if (c == '/' || c == '\\') break;
-    p--;
-    fl++;
-  }
-
-  ll = (ln < 10000 ? (ln < 1000 ? (ln < 100 ? (ln < 10 ? 1 : 2) : 3) : 4) : 5);
-  if (fl > (sizeof(prefix) - ll - 2)) fl = (sizeof(prefix) - ll - 2);
-
-  pl = fl + 1 + ll;
-  memcpy(prefix, p, fl);
-  q = prefix + pl;
-  memset(q, ' ', sizeof(prefix) - pl);
-  do {
-    *(--q) = '0' + (ln % 10);
-    ln /= 10;
-  } while (ln > 0);
-  *(--q) = ':';
-
-  if (s_file_level != NULL) {
-    enum cs_log_level pll = cs_log_level;
-    struct mg_str mgfl = mg_mk_str(s_file_level), ps = MG_MK_STR_N(prefix, pl);
-    struct mg_str k, v;
-    while ((mgfl = mg_next_comma_list_entry_n(mgfl, &k, &v)).p != NULL) {
-      bool yes = !(!mg_str_starts_with(ps, k) || v.len == 0);
-      if (!yes) continue;
-      pll = (enum cs_log_level)(*v.p - '0');
-      break;
-    }
-    if (level > pll) return 0;
+  size_t i, n = strlen(path);
+  if (mg_unpack(path, size, mtime)) return MG_FS_READ;  // Regular file
+  // Scan all files. If `path` is a dir prefix for any of them, it's a dir
+  for (i = 0; (p = mg_unlist(i)) != NULL; i++) {
+    if (is_dir_prefix(path, n, p)) return MG_FS_DIR;
   }
+  return 0;
+}
 
-  if (cs_log_file == NULL) cs_log_file = stderr;
-  cs_log_cur_msg_level = level;
-  fwrite(prefix, 1, sizeof(prefix), cs_log_file);
-#if CS_LOG_ENABLE_TS_DIFF
-  {
-    double now = cs_time();
-    fprintf(cs_log_file, "%7u ", (unsigned int) ((now - cs_log_ts) * 1000000));
-    cs_log_ts = now;
+static void packed_list(const char *dir, void (*fn)(const char *, void *),
+                        void *userdata) {
+  char buf[256], tmp[sizeof(buf)];
+  const char *path, *begin, *end;
+  size_t i, n = strlen(dir);
+  tmp[0] = '\0';  // Previously listed entry
+  for (i = 0; (path = mg_unlist(i)) != NULL; i++) {
+    if (!is_dir_prefix(dir, n, path)) continue;
+    begin = &path[n + 1];
+    end = strchr(begin, '/');
+    if (end == NULL) end = begin + strlen(begin);
+    snprintf(buf, sizeof(buf), "%.*s", (int) (end - begin), begin);
+    buf[sizeof(buf) - 1] = '\0';
+    // If this entry has been already listed, skip
+    // NOTE: we're assuming that file list is sorted alphabetically
+    if (strcmp(buf, tmp) == 0) continue;
+    fn(buf, userdata);  // Not yet listed, call user function
+    strcpy(tmp, buf);   // And save this entry as listed
   }
-#endif
-  return 1;
 }
 
-void cs_log_printf(const char *fmt, ...) WEAK;
-void cs_log_printf(const char *fmt, ...) {
-  va_list ap;
-  va_start(ap, fmt);
-  vfprintf(cs_log_file, fmt, ap);
-  va_end(ap);
-  fputc('\n', cs_log_file);
-  fflush(cs_log_file);
-  cs_log_cur_msg_level = LL_NONE;
+static void *packed_open(const char *path, int flags) {
+  size_t size = 0;
+  const char *data = mg_unpack(path, &size, NULL);
+  struct packed_file *fp = NULL;
+  if (data == NULL) return NULL;
+  if (flags & MG_FS_WRITE) return NULL;
+  fp = (struct packed_file *) calloc(1, sizeof(*fp));
+  fp->size = size;
+  fp->data = data;
+  return (void *) fp;
 }
 
-void cs_log_set_file(FILE *file) WEAK;
-void cs_log_set_file(FILE *file) {
-  cs_log_file = file;
+static void packed_close(void *fp) {
+  if (fp != NULL) free(fp);
 }
 
-#else
-
-void cs_log_set_file_level(const char *file_level) {
-  (void) file_level;
+static size_t packed_read(void *fd, void *buf, size_t len) {
+  struct packed_file *fp = (struct packed_file *) fd;
+  if (fp->pos + len > fp->size) len = fp->size - fp->pos;
+  memcpy(buf, &fp->data[fp->pos], len);
+  fp->pos += len;
+  return len;
 }
 
-#endif /* CS_ENABLE_STDIO */
-
-void cs_log_set_level(enum cs_log_level level) WEAK;
-void cs_log_set_level(enum cs_log_level level) {
-  cs_log_level = level;
-#if CS_LOG_ENABLE_TS_DIFF && CS_ENABLE_STDIO
-  cs_log_ts = cs_time();
-#endif
+static size_t packed_write(void *fd, const void *buf, size_t len) {
+  (void) fd, (void) buf, (void) len;
+  return 0;
 }
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_dirent.h"
-#endif
 
-#ifndef CS_COMMON_CS_DIRENT_H_
-#define CS_COMMON_CS_DIRENT_H_
+static size_t packed_seek(void *fd, size_t offset) {
+  struct packed_file *fp = (struct packed_file *) fd;
+  fp->pos = offset;
+  if (fp->pos > fp->size) fp->pos = fp->size;
+  return fp->pos;
+}
 
-#include <limits.h>
+static bool packed_rename(const char *from, const char *to) {
+  (void) from, (void) to;
+  return false;
+}
 
-/* Amalgamated: #include "common/platform.h" */
+static bool packed_remove(const char *path) {
+  (void) path;
+  return false;
+}
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
+static bool packed_mkdir(const char *path) {
+  (void) path;
+  return false;
+}
 
-#ifdef CS_DEFINE_DIRENT
-typedef struct { int dummy; } DIR;
+struct mg_fs mg_fs_packed = {
+    packed_stat,  packed_list, packed_open,   packed_close,  packed_read,
+    packed_write, packed_seek, packed_rename, packed_remove, packed_mkdir};
 
-struct dirent {
-  int d_ino;
-#ifdef _WIN32
-  char d_name[MAX_PATH];
-#else
-  /* TODO(rojer): Use PATH_MAX but make sure it's sane on every platform */
-  char d_name[256];
+#ifdef MG_ENABLE_LINES
+#line 1 "src/fs_posix.c"
 #endif
-};
 
-DIR *opendir(const char *dir_name);
-int closedir(DIR *dir);
-struct dirent *readdir(DIR *dir);
-#endif /* CS_DEFINE_DIRENT */
 
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
+#if MG_ENABLE_FILE
 
-#endif /* CS_COMMON_CS_DIRENT_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_dirent.c"
+#ifndef MG_STAT_STRUCT
+#define MG_STAT_STRUCT stat
 #endif
 
-#ifndef EXCLUDE_COMMON
-
-/* Amalgamated: #include "common/mg_mem.h" */
-/* Amalgamated: #include "common/cs_dirent.h" */
+#ifndef MG_STAT_FUNC
+#define MG_STAT_FUNC stat
+#endif
 
-/*
- * This file contains POSIX opendir/closedir/readdir API implementation
- * for systems which do not natively support it (e.g. Windows).
- */
+static int p_stat(const char *path, size_t *size, time_t *mtime) {
+#if !defined(S_ISDIR)
+  LOG(LL_ERROR, ("stat() API is not supported. %p %p %p", path, size, mtime));
+  return 0;
+#else
+#if defined(_WIN32)
+  struct _stati64 st;
+  wchar_t tmp[PATH_MAX];
+  MultiByteToWideChar(CP_UTF8, 0, path, -1, tmp, sizeof(tmp) / sizeof(tmp[0]));
+  if (_wstati64(tmp, &st) != 0) return 0;
+#else
+  struct MG_STAT_STRUCT st;
+  if (MG_STAT_FUNC(path, &st) != 0) return 0;
+#endif
+  if (size) *size = (size_t) st.st_size;
+  if (mtime) *mtime = st.st_mtime;
+  return MG_FS_READ | MG_FS_WRITE | (S_ISDIR(st.st_mode) ? MG_FS_DIR : 0);
+#endif
+}
 
 #ifdef _WIN32
-struct win32_dir {
-  DIR d;
+struct dirent {
+  char d_name[MAX_PATH];
+};
+
+typedef struct win32_dir {
   HANDLE handle;
   WIN32_FIND_DATAW info;
   struct dirent result;
-};
+} DIR;
 
-DIR *opendir(const char *name) {
-  struct win32_dir *dir = NULL;
-  wchar_t wpath[MAX_PATH];
-  DWORD attrs;
+int gettimeofday(struct timeval *tv, void *tz) {
+  FILETIME ft;
+  unsigned __int64 tmpres = 0;
+
+  if (tv != NULL) {
+    GetSystemTimeAsFileTime(&ft);
+    tmpres |= ft.dwHighDateTime;
+    tmpres <<= 32;
+    tmpres |= ft.dwLowDateTime;
+    tmpres /= 10;  // convert into microseconds
+    tmpres -= (int64_t) 11644473600000000;
+    tv->tv_sec = (long) (tmpres / 1000000UL);
+    tv->tv_usec = (long) (tmpres % 1000000UL);
+  }
+  (void) tz;
+  return 0;
+}
 
-  if (name == NULL) {
-    SetLastError(ERROR_BAD_ARGUMENTS);
-  } else if ((dir = (struct win32_dir *) MG_MALLOC(sizeof(*dir))) == NULL) {
-    SetLastError(ERROR_NOT_ENOUGH_MEMORY);
-  } else {
-    to_wchar(name, wpath, ARRAY_SIZE(wpath));
-    attrs = GetFileAttributesW(wpath);
-    if (attrs != 0xFFFFFFFF && (attrs & FILE_ATTRIBUTE_DIRECTORY)) {
-      (void) wcscat(wpath, L"\\*");
-      dir->handle = FindFirstFileW(wpath, &dir->info);
-      dir->result.d_name[0] = '\0';
-    } else {
-      MG_FREE(dir);
-      dir = NULL;
-    }
+static int to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len) {
+  int ret;
+  char buf[MAX_PATH * 2], buf2[MAX_PATH * 2], *p;
+  strncpy(buf, path, sizeof(buf));
+  buf[sizeof(buf) - 1] = '\0';
+  // Trim trailing slashes. Leave backslash for paths like "X:\"
+  p = buf + strlen(buf) - 1;
+  while (p > buf && p[-1] != ':' && (p[0] == '\\' || p[0] == '/')) *p-- = '\0';
+  memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
+  ret = MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
+  // Convert back to Unicode. If doubly-converted string does not match the
+  // original, something is fishy, reject.
+  WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
+                      NULL, NULL);
+  if (strcmp(buf, buf2) != 0) {
+    wbuf[0] = L'\0';
+    ret = 0;
   }
+  return ret;
+}
 
-  return (DIR *) dir;
+DIR *opendir(const char *name) {
+  DIR *d = NULL;
+  wchar_t wpath[MAX_PATH];
+  DWORD attrs;
+
+  if (name == NULL) {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  } else if ((d = (DIR *) calloc(1, sizeof(*d))) == NULL) {
+    SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+  } else {
+    to_wchar(name, wpath, sizeof(wpath) / sizeof(wpath[0]));
+    attrs = GetFileAttributesW(wpath);
+    if (attrs != 0Xffffffff && (attrs & FILE_ATTRIBUTE_DIRECTORY)) {
+      (void) wcscat(wpath, L"\\*");
+      d->handle = FindFirstFileW(wpath, &d->info);
+      d->result.d_name[0] = '\0';
+    } else {
+      free(d);
+      d = NULL;
+    }
+  }
+  return d;
 }
 
 int closedir(DIR *d) {
-  struct win32_dir *dir = (struct win32_dir *) d;
   int result = 0;
-
-  if (dir != NULL) {
-    if (dir->handle != INVALID_HANDLE_VALUE)
-      result = FindClose(dir->handle) ? 0 : -1;
-    MG_FREE(dir);
+  if (d != NULL) {
+    if (d->handle != INVALID_HANDLE_VALUE)
+      result = FindClose(d->handle) ? 0 : -1;
+    free(d);
   } else {
     result = -1;
     SetLastError(ERROR_BAD_ARGUMENTS);
   }
-
   return result;
 }
 
 struct dirent *readdir(DIR *d) {
-  struct win32_dir *dir = (struct win32_dir *) d;
   struct dirent *result = NULL;
-
-  if (dir) {
-    memset(&dir->result, 0, sizeof(dir->result));
-    if (dir->handle != INVALID_HANDLE_VALUE) {
-      result = &dir->result;
-      (void) WideCharToMultiByte(CP_UTF8, 0, dir->info.cFileName, -1,
-                                 result->d_name, sizeof(result->d_name), NULL,
-                                 NULL);
-
-      if (!FindNextFileW(dir->handle, &dir->info)) {
-        (void) FindClose(dir->handle);
-        dir->handle = INVALID_HANDLE_VALUE;
+  if (d != NULL) {
+    memset(&d->result, 0, sizeof(d->result));
+    if (d->handle != INVALID_HANDLE_VALUE) {
+      result = &d->result;
+      WideCharToMultiByte(CP_UTF8, 0, d->info.cFileName, -1, result->d_name,
+                          sizeof(result->d_name), NULL, NULL);
+      if (!FindNextFileW(d->handle, &d->info)) {
+        FindClose(d->handle);
+        d->handle = INVALID_HANDLE_VALUE;
       }
-
     } else {
       SetLastError(ERROR_FILE_NOT_FOUND);
     }
   } else {
     SetLastError(ERROR_BAD_ARGUMENTS);
   }
-
   return result;
 }
 #endif
 
-#endif /* EXCLUDE_COMMON */
-
-/* ISO C requires a translation unit to contain at least one declaration */
-typedef int cs_dirent_dummy;
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_time.c"
-#endif
-
-/* Amalgamated: #include "common/cs_time.h" */
-
-#ifndef _WIN32
-#include <stddef.h>
-/*
- * There is no sys/time.h on ARMCC.
- */
-#if !(defined(__ARMCC_VERSION) || defined(__ICCARM__)) && \
-    !defined(__TI_COMPILER_VERSION__) &&                  \
-    (!defined(CS_PLATFORM) || CS_PLATFORM != CS_P_NXP_LPC)
-#include <sys/time.h>
-#endif
+static void p_list(const char *dir, void (*fn)(const char *, void *),
+                   void *userdata) {
+#if MG_ENABLE_DIRLIST
+  struct dirent *dp;
+  DIR *dirp;
+  if ((dirp = (opendir(dir))) == NULL) return;
+  while ((dp = readdir(dirp)) != NULL) {
+    if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) continue;
+    fn(dp->d_name, userdata);
+  }
+  closedir(dirp);
 #else
-#include <windows.h>
+  (void) dir, (void) fn, (void) userdata;
 #endif
+}
 
-double cs_time(void) WEAK;
-double cs_time(void) {
-  double now;
-#ifndef _WIN32
-  struct timeval tv;
-  if (gettimeofday(&tv, NULL /* tz */) != 0) return 0;
-  now = (double) tv.tv_sec + (((double) tv.tv_usec) / 1000000.0);
+static void *p_open(const char *path, int flags) {
+  const char *mode = flags == MG_FS_READ ? "rb" : "a+b";
+#ifdef _WIN32
+  wchar_t b1[PATH_MAX], b2[10];
+  MultiByteToWideChar(CP_UTF8, 0, path, -1, b1, sizeof(b1) / sizeof(b1[0]));
+  MultiByteToWideChar(CP_UTF8, 0, mode, -1, b2, sizeof(b2) / sizeof(b2[0]));
+  return (void *) _wfopen(b1, b2);
 #else
-  SYSTEMTIME sysnow;
-  FILETIME ftime;
-  GetLocalTime(&sysnow);
-  SystemTimeToFileTime(&sysnow, &ftime);
-  /*
-   * 1. VC 6.0 doesn't support conversion uint64 -> double, so, using int64
-   * This should not cause a problems in this (21th) century
-   * 2. Windows FILETIME is a number of 100-nanosecond intervals since January
-   * 1, 1601 while time_t is a number of _seconds_ since January 1, 1970 UTC,
-   * thus, we need to convert to seconds and adjust amount (subtract 11644473600
-   * seconds)
-   */
-  now = (double) (((int64_t) ftime.dwLowDateTime +
-                   ((int64_t) ftime.dwHighDateTime << 32)) /
-                  10000000.0) -
-        11644473600;
-#endif /* _WIN32 */
-  return now;
-}
-
-double cs_timegm(const struct tm *tm) {
-  /* Month-to-day offset for non-leap-years. */
-  static const int month_day[12] = {0,   31,  59,  90,  120, 151,
-                                    181, 212, 243, 273, 304, 334};
-
-  /* Most of the calculation is easy; leap years are the main difficulty. */
-  int month = tm->tm_mon % 12;
-  int year = tm->tm_year + tm->tm_mon / 12;
-  int year_for_leap;
-  int64_t rt;
-
-  if (month < 0) { /* Negative values % 12 are still negative. */
-    month += 12;
-    --year;
-  }
-
-  /* This is the number of Februaries since 1900. */
-  year_for_leap = (month > 1) ? year + 1 : year;
-
-  rt =
-      tm->tm_sec /* Seconds */
-      +
-      60 *
-          (tm->tm_min /* Minute = 60 seconds */
-           +
-           60 * (tm->tm_hour /* Hour = 60 minutes */
-                 +
-                 24 * (month_day[month] + tm->tm_mday - 1 /* Day = 24 hours */
-                       + 365 * (year - 70)                /* Year = 365 days */
-                       + (year_for_leap - 69) / 4 /* Every 4 years is leap... */
-                       - (year_for_leap - 1) / 100 /* Except centuries... */
-                       + (year_for_leap + 299) / 400))); /* Except 400s. */
-  return rt < 0 ? -1 : (double) rt;
-}
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_endian.h"
+  return (void *) fopen(path, mode);
 #endif
+}
 
-#ifndef CS_COMMON_CS_ENDIAN_H_
-#define CS_COMMON_CS_ENDIAN_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
+static void p_close(void *fp) {
+  fclose((FILE *) fp);
+}
 
-/*
- * clang with std=-c99 uses __LITTLE_ENDIAN, by default
- * while for ex, RTOS gcc - LITTLE_ENDIAN, by default
- * it depends on __USE_BSD, but let's have everything
- */
-#if !defined(BYTE_ORDER) && defined(__BYTE_ORDER)
-#define BYTE_ORDER __BYTE_ORDER
-#ifndef LITTLE_ENDIAN
-#define LITTLE_ENDIAN __LITTLE_ENDIAN
-#endif /* LITTLE_ENDIAN */
-#ifndef BIG_ENDIAN
-#define BIG_ENDIAN __LITTLE_ENDIAN
-#endif /* BIG_ENDIAN */
-#endif /* BYTE_ORDER */
+static size_t p_read(void *fp, void *buf, size_t len) {
+  return fread(buf, 1, len, (FILE *) fp);
+}
 
-#ifdef __cplusplus
+static size_t p_write(void *fp, const void *buf, size_t len) {
+  return fwrite(buf, 1, len, (FILE *) fp);
 }
-#endif
 
-#endif /* CS_COMMON_CS_ENDIAN_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_md5.c"
+static size_t p_seek(void *fp, size_t offset) {
+#if (defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64) ||  \
+    (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \
+    (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
+  fseeko((FILE *) fp, (off_t) offset, SEEK_SET);
+#else
+  fseek((FILE *) fp, (long) offset, SEEK_SET);
 #endif
-/*
- * This code implements the MD5 message-digest algorithm.
- * The algorithm is due to Ron Rivest.  This code was
- * written by Colin Plumb in 1993, no copyright is claimed.
- * This code is in the public domain; do with it what you wish.
- *
- * Equivalent code is available from RSA Data Security, Inc.
- * This code has been tested against that, and is equivalent,
- * except that you don't need to include two pages of legalese
- * with every copy.
- *
- * To compute the message digest of a chunk of bytes, declare an
- * MD5Context structure, pass it to MD5Init, call MD5Update as
- * needed on buffers full of bytes, and then call MD5Final, which
- * will fill a supplied 16-byte array with the digest.
- */
+  return (size_t) ftell((FILE *) fp);
+}
 
-/* Amalgamated: #include "common/cs_md5.h" */
-/* Amalgamated: #include "common/str_util.h" */
+static bool p_rename(const char *from, const char *to) {
+  return rename(from, to) == 0;
+}
 
-#if !defined(EXCLUDE_COMMON)
-#if !CS_DISABLE_MD5
+static bool p_remove(const char *path) {
+  return remove(path) == 0;
+}
 
-/* Amalgamated: #include "common/cs_endian.h" */
+static bool p_mkdir(const char *path) {
+  return mkdir(path, 0775) == 0;
+}
 
-static void byteReverse(unsigned char *buf, unsigned longs) {
-/* Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN */
-#if BYTE_ORDER == BIG_ENDIAN
-  do {
-    uint32_t t = (uint32_t)((unsigned) buf[3] << 8 | buf[2]) << 16 |
-                 ((unsigned) buf[1] << 8 | buf[0]);
-    *(uint32_t *) buf = t;
-    buf += 4;
-  } while (--longs);
 #else
-  (void) buf;
-  (void) longs;
-#endif
-}
 
-#define F1(x, y, z) (z ^ (x & (y ^ z)))
-#define F2(x, y, z) F1(z, x, y)
-#define F3(x, y, z) (x ^ y ^ z)
-#define F4(x, y, z) (y ^ (x | ~z))
+static int p_stat(const char *path, size_t *size, time_t *mtime) {
+  (void) path, (void) size, (void) mtime;
+  return 0;
+}
+static void p_list(const char *path, void (*fn)(const char *, void *),
+                   void *userdata) {
+  (void) path, (void) fn, (void) userdata;
+}
+static void *p_open(const char *path, int flags) {
+  (void) path, (void) flags;
+  return NULL;
+}
+static void p_close(void *fp) {
+  (void) fp;
+}
+static size_t p_read(void *fd, void *buf, size_t len) {
+  (void) fd, (void) buf, (void) len;
+  return 0;
+}
+static size_t p_write(void *fd, const void *buf, size_t len) {
+  (void) fd, (void) buf, (void) len;
+  return 0;
+}
+static size_t p_seek(void *fd, size_t offset) {
+  (void) fd, (void) offset;
+  return (size_t) ~0;
+}
+static bool p_rename(const char *from, const char *to) {
+  (void) from, (void) to;
+  return false;
+}
+static bool p_remove(const char *path) {
+  (void) path;
+  return false;
+}
+static bool p_mkdir(const char *path) {
+  (void) path;
+  return false;
+}
+#endif
 
-#define MD5STEP(f, w, x, y, z, data, s) \
-  (w += f(x, y, z) + data, w = w << s | w >> (32 - s), w += x)
+struct mg_fs mg_fs_posix = {p_stat,  p_list, p_open,   p_close,  p_read,
+                            p_write, p_seek, p_rename, p_remove, p_mkdir};
 
-/*
- * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
- * initialization constants.
- */
-void cs_md5_init(cs_md5_ctx *ctx) {
-  ctx->buf[0] = 0x67452301;
-  ctx->buf[1] = 0xefcdab89;
-  ctx->buf[2] = 0x98badcfe;
-  ctx->buf[3] = 0x10325476;
+#ifdef MG_ENABLE_LINES
+#line 1 "src/http.c"
+#endif
 
-  ctx->bits[0] = 0;
-  ctx->bits[1] = 0;
-}
 
-static void cs_md5_transform(uint32_t buf[4], uint32_t const in[16]) {
-  register uint32_t a, b, c, d;
 
-  a = buf[0];
-  b = buf[1];
-  c = buf[2];
-  d = buf[3];
 
-  MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
-  MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
-  MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
-  MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
-  MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
-  MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
-  MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
-  MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
-  MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
-  MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
-  MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
-  MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
-  MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
-  MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
-  MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
-  MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
 
-  MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
-  MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
-  MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
-  MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
-  MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
-  MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
-  MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
-  MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
-  MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
-  MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
-  MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
-  MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
-  MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
-  MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
-  MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
-  MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
 
-  MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
-  MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
-  MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
-  MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
-  MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
-  MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
-  MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
-  MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
-  MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
-  MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
-  MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
-  MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
-  MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
-  MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
-  MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
-  MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
 
-  MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
-  MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
-  MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
-  MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
-  MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
-  MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
-  MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
-  MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
-  MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
-  MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
-  MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
-  MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
-  MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
-  MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
-  MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
-  MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
 
-  buf[0] += a;
-  buf[1] += b;
-  buf[2] += c;
-  buf[3] += d;
-}
 
-void cs_md5_update(cs_md5_ctx *ctx, const unsigned char *buf, size_t len) {
-  uint32_t t;
 
-  t = ctx->bits[0];
-  if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t) ctx->bits[1]++;
-  ctx->bits[1] += (uint32_t) len >> 29;
+// Multipart POST example:
+// --xyz
+// Content-Disposition: form-data; name="val"
+//
+// abcdef
+// --xyz
+// Content-Disposition: form-data; name="foo"; filename="a.txt"
+// Content-Type: text/plain
+//
+// hello world
+//
+// --xyz--
+size_t mg_http_next_multipart(struct mg_str body, size_t ofs,
+                              struct mg_http_part *part) {
+  struct mg_str cd = mg_str_n("Content-Disposition", 19);
+  const char *s = body.ptr;
+  size_t b = ofs, h1, h2, b1, b2, max = body.len;
 
-  t = (t >> 3) & 0x3f;
+  // Init part params
+  if (part != NULL) part->name = part->filename = part->body = mg_str_n(0, 0);
 
-  if (t) {
-    unsigned char *p = (unsigned char *) ctx->in + t;
+  // Skip boundary
+  while (b + 2 < max && s[b] != '\r' && s[b + 1] != '\n') b++;
+  if (b <= ofs || b + 2 >= max) return 0;
+  // LOG(LL_INFO, ("B: %zu %zu [%.*s]", ofs, b - ofs, (int) (b - ofs), s));
 
-    t = 64 - t;
-    if (len < t) {
-      memcpy(p, buf, len);
-      return;
+  // Skip headers
+  h1 = h2 = b + 2;
+  for (;;) {
+    while (h2 + 2 < max && s[h2] != '\r' && s[h2 + 1] != '\n') h2++;
+    if (h2 == h1) break;
+    if (h2 + 2 >= max) return 0;
+    // LOG(LL_INFO, ("Header: [%.*s]", (int) (h2 - h1), &s[h1]));
+    if (part != NULL && h1 + cd.len + 2 < h2 && s[h1 + cd.len] == ':' &&
+        mg_ncasecmp(&s[h1], cd.ptr, cd.len) == 0) {
+      struct mg_str v = mg_str_n(&s[h1 + cd.len + 2], h2 - (h1 + cd.len + 2));
+      part->name = mg_http_get_header_var(v, mg_str_n("name", 4));
+      part->filename = mg_http_get_header_var(v, mg_str_n("filename", 8));
     }
-    memcpy(p, buf, t);
-    byteReverse(ctx->in, 16);
-    cs_md5_transform(ctx->buf, (uint32_t *) ctx->in);
-    buf += t;
-    len -= t;
-  }
-
-  while (len >= 64) {
-    memcpy(ctx->in, buf, 64);
-    byteReverse(ctx->in, 16);
-    cs_md5_transform(ctx->buf, (uint32_t *) ctx->in);
-    buf += 64;
-    len -= 64;
+    h1 = h2 = h2 + 2;
   }
+  b1 = b2 = h2 + 2;
+  while (b2 + 2 + (b - ofs) + 2 < max && !(s[b2] == '\r' && s[b2 + 1] == '\n' &&
+                                           memcmp(&s[b2 + 2], s, b - ofs) == 0))
+    b2++;
 
-  memcpy(ctx->in, buf, len);
+  if (b2 + 2 >= max) return 0;
+  if (part != NULL) part->body = mg_str_n(&s[b1], b2 - b1);
+  // LOG(LL_INFO, ("Body: [%.*s]", (int) (b2 - b1), &s[b1]));
+  return b2 + 2;
 }
 
-void cs_md5_final(unsigned char digest[16], cs_md5_ctx *ctx) {
-  unsigned count;
-  unsigned char *p;
-  uint32_t *a;
-
-  count = (ctx->bits[0] >> 3) & 0x3F;
-
-  p = ctx->in + count;
-  *p++ = 0x80;
-  count = 64 - 1 - count;
-  if (count < 8) {
-    memset(p, 0, count);
-    byteReverse(ctx->in, 16);
-    cs_md5_transform(ctx->buf, (uint32_t *) ctx->in);
-    memset(ctx->in, 0, 56);
+void mg_http_bauth(struct mg_connection *c, const char *user,
+                   const char *pass) {
+  struct mg_str u = mg_str(user), p = mg_str(pass);
+  size_t need = c->send.len + 36 + (u.len + p.len) * 2;
+  if (c->send.size < need) mg_iobuf_resize(&c->send, need);
+  if (c->send.size >= need) {
+    int i, n = 0;
+    char *buf = (char *) &c->send.buf[c->send.len + 21];
+    memcpy(&buf[-21], "Authorization: Basic ", 21);  // DON'T use mg_send!
+    for (i = 0; i < (int) u.len; i++) {
+      n = mg_base64_update(((unsigned char *) u.ptr)[i], buf, n);
+    }
+    if (p.len > 0) {
+      n = mg_base64_update(':', buf, n);
+      for (i = 0; i < (int) p.len; i++) {
+        n = mg_base64_update(((unsigned char *) p.ptr)[i], buf, n);
+      }
+    }
+    n = mg_base64_final(buf, n);
+    c->send.len += 21 + (size_t) n + 2;
+    memcpy(&c->send.buf[c->send.len - 2], "\r\n", 2);
   } else {
-    memset(p, 0, count - 8);
+    LOG(LL_ERROR, ("%lu %s cannot resize iobuf %d->%d ", c->id, c->label,
+                   (int) c->send.size, (int) need));
   }
-  byteReverse(ctx->in, 14);
+}
 
-  a = (uint32_t *) ctx->in;
-  a[14] = ctx->bits[0];
-  a[15] = ctx->bits[1];
+int mg_http_get_var(const struct mg_str *buf, const char *name, char *dst,
+                    size_t dst_len) {
+  const char *p, *e, *s;
+  size_t name_len;
+  int len;
 
-  cs_md5_transform(ctx->buf, (uint32_t *) ctx->in);
-  byteReverse((unsigned char *) ctx->buf, 4);
-  memcpy(digest, ctx->buf, 16);
-  memset((char *) ctx, 0, sizeof(*ctx));
+  if (dst == NULL || dst_len == 0) {
+    len = -2;  // Bad destination
+  } else if (buf->ptr == NULL || name == NULL || buf->len == 0) {
+    len = -1;  // Bad source
+    dst[0] = '\0';
+  } else {
+    name_len = strlen(name);
+    e = buf->ptr + buf->len;
+    len = -4;  // Name does not exist
+    dst[0] = '\0';
+    for (p = buf->ptr; p + name_len < e; p++) {
+      if ((p == buf->ptr || p[-1] == '&') && p[name_len] == '=' &&
+          !mg_ncasecmp(name, p, name_len)) {
+        p += name_len + 1;
+        s = (const char *) memchr(p, '&', (size_t) (e - p));
+        if (s == NULL) s = e;
+        len = mg_url_decode(p, (size_t) (s - p), dst, dst_len, 1);
+        if (len < 0) len = -3;  // Failed to decode
+        break;
+      }
+    }
+  }
+  return len;
 }
 
-#endif /* CS_DISABLE_MD5 */
-#endif /* EXCLUDE_COMMON */
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_sha1.c"
-#endif
-/* Copyright(c) By Steve Reid <steve@edmweb.com> */
-/* 100% Public Domain */
-
-/* Amalgamated: #include "common/cs_sha1.h" */
-
-#if !CS_DISABLE_SHA1 && !defined(EXCLUDE_COMMON)
-
-/* Amalgamated: #include "common/cs_endian.h" */
-
-#define SHA1HANDSOFF
-#if defined(__sun)
-/* Amalgamated: #include "common/solarisfixes.h" */
-#endif
-
-union char64long16 {
-  unsigned char c[64];
-  uint32_t l[16];
-};
-
-#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
-
-static uint32_t blk0(union char64long16 *block, int i) {
-/* Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN */
-#if BYTE_ORDER == LITTLE_ENDIAN
-  block->l[i] =
-      (rol(block->l[i], 24) & 0xFF00FF00) | (rol(block->l[i], 8) & 0x00FF00FF);
-#endif
-  return block->l[i];
-}
-
-/* Avoid redefine warning (ARM /usr/include/sys/ucontext.h define R0~R4) */
-#undef blk
-#undef R0
-#undef R1
-#undef R2
-#undef R3
-#undef R4
-
-#define blk(i)                                                               \
-  (block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ block->l[(i + 8) & 15] ^ \
-                              block->l[(i + 2) & 15] ^ block->l[i & 15],     \
-                          1))
-#define R0(v, w, x, y, z, i)                                          \
-  z += ((w & (x ^ y)) ^ y) + blk0(block, i) + 0x5A827999 + rol(v, 5); \
-  w = rol(w, 30);
-#define R1(v, w, x, y, z, i)                                  \
-  z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
-  w = rol(w, 30);
-#define R2(v, w, x, y, z, i)                          \
-  z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
-  w = rol(w, 30);
-#define R3(v, w, x, y, z, i)                                        \
-  z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
-  w = rol(w, 30);
-#define R4(v, w, x, y, z, i)                          \
-  z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
-  w = rol(w, 30);
-
-static void cs_sha1_transform(uint32_t state[5], const unsigned char buffer[64]) {
-  uint32_t a, b, c, d, e;
-  union char64long16 block[1];
-
-  memcpy(block, buffer, 64);
-  a = state[0];
-  b = state[1];
-  c = state[2];
-  d = state[3];
-  e = state[4];
-  R0(a, b, c, d, e, 0);
-  R0(e, a, b, c, d, 1);
-  R0(d, e, a, b, c, 2);
-  R0(c, d, e, a, b, 3);
-  R0(b, c, d, e, a, 4);
-  R0(a, b, c, d, e, 5);
-  R0(e, a, b, c, d, 6);
-  R0(d, e, a, b, c, 7);
-  R0(c, d, e, a, b, 8);
-  R0(b, c, d, e, a, 9);
-  R0(a, b, c, d, e, 10);
-  R0(e, a, b, c, d, 11);
-  R0(d, e, a, b, c, 12);
-  R0(c, d, e, a, b, 13);
-  R0(b, c, d, e, a, 14);
-  R0(a, b, c, d, e, 15);
-  R1(e, a, b, c, d, 16);
-  R1(d, e, a, b, c, 17);
-  R1(c, d, e, a, b, 18);
-  R1(b, c, d, e, a, 19);
-  R2(a, b, c, d, e, 20);
-  R2(e, a, b, c, d, 21);
-  R2(d, e, a, b, c, 22);
-  R2(c, d, e, a, b, 23);
-  R2(b, c, d, e, a, 24);
-  R2(a, b, c, d, e, 25);
-  R2(e, a, b, c, d, 26);
-  R2(d, e, a, b, c, 27);
-  R2(c, d, e, a, b, 28);
-  R2(b, c, d, e, a, 29);
-  R2(a, b, c, d, e, 30);
-  R2(e, a, b, c, d, 31);
-  R2(d, e, a, b, c, 32);
-  R2(c, d, e, a, b, 33);
-  R2(b, c, d, e, a, 34);
-  R2(a, b, c, d, e, 35);
-  R2(e, a, b, c, d, 36);
-  R2(d, e, a, b, c, 37);
-  R2(c, d, e, a, b, 38);
-  R2(b, c, d, e, a, 39);
-  R3(a, b, c, d, e, 40);
-  R3(e, a, b, c, d, 41);
-  R3(d, e, a, b, c, 42);
-  R3(c, d, e, a, b, 43);
-  R3(b, c, d, e, a, 44);
-  R3(a, b, c, d, e, 45);
-  R3(e, a, b, c, d, 46);
-  R3(d, e, a, b, c, 47);
-  R3(c, d, e, a, b, 48);
-  R3(b, c, d, e, a, 49);
-  R3(a, b, c, d, e, 50);
-  R3(e, a, b, c, d, 51);
-  R3(d, e, a, b, c, 52);
-  R3(c, d, e, a, b, 53);
-  R3(b, c, d, e, a, 54);
-  R3(a, b, c, d, e, 55);
-  R3(e, a, b, c, d, 56);
-  R3(d, e, a, b, c, 57);
-  R3(c, d, e, a, b, 58);
-  R3(b, c, d, e, a, 59);
-  R4(a, b, c, d, e, 60);
-  R4(e, a, b, c, d, 61);
-  R4(d, e, a, b, c, 62);
-  R4(c, d, e, a, b, 63);
-  R4(b, c, d, e, a, 64);
-  R4(a, b, c, d, e, 65);
-  R4(e, a, b, c, d, 66);
-  R4(d, e, a, b, c, 67);
-  R4(c, d, e, a, b, 68);
-  R4(b, c, d, e, a, 69);
-  R4(a, b, c, d, e, 70);
-  R4(e, a, b, c, d, 71);
-  R4(d, e, a, b, c, 72);
-  R4(c, d, e, a, b, 73);
-  R4(b, c, d, e, a, 74);
-  R4(a, b, c, d, e, 75);
-  R4(e, a, b, c, d, 76);
-  R4(d, e, a, b, c, 77);
-  R4(c, d, e, a, b, 78);
-  R4(b, c, d, e, a, 79);
-  state[0] += a;
-  state[1] += b;
-  state[2] += c;
-  state[3] += d;
-  state[4] += e;
-  /* Erase working structures. The order of operations is important,
-   * used to ensure that compiler doesn't optimize those out. */
-  memset(block, 0, sizeof(block));
-  a = b = c = d = e = 0;
-  (void) a;
-  (void) b;
-  (void) c;
-  (void) d;
-  (void) e;
-}
-
-void cs_sha1_init(cs_sha1_ctx *context) {
-  context->state[0] = 0x67452301;
-  context->state[1] = 0xEFCDAB89;
-  context->state[2] = 0x98BADCFE;
-  context->state[3] = 0x10325476;
-  context->state[4] = 0xC3D2E1F0;
-  context->count[0] = context->count[1] = 0;
-}
-
-void cs_sha1_update(cs_sha1_ctx *context, const unsigned char *data,
-                    uint32_t len) {
-  uint32_t i, j;
-
-  j = context->count[0];
-  if ((context->count[0] += len << 3) < j) context->count[1]++;
-  context->count[1] += (len >> 29);
-  j = (j >> 3) & 63;
-  if ((j + len) > 63) {
-    memcpy(&context->buffer[j], data, (i = 64 - j));
-    cs_sha1_transform(context->state, context->buffer);
-    for (; i + 63 < len; i += 64) {
-      cs_sha1_transform(context->state, &data[i]);
-    }
-    j = 0;
-  } else
-    i = 0;
-  memcpy(&context->buffer[j], &data[i], len - i);
-}
-
-void cs_sha1_final(unsigned char digest[20], cs_sha1_ctx *context) {
-  unsigned i;
-  unsigned char finalcount[8], c;
-
-  for (i = 0; i < 8; i++) {
-    finalcount[i] = (unsigned char) ((context->count[(i >= 4 ? 0 : 1)] >>
-                                      ((3 - (i & 3)) * 8)) &
-                                     255);
-  }
-  c = 0200;
-  cs_sha1_update(context, &c, 1);
-  while ((context->count[0] & 504) != 448) {
-    c = 0000;
-    cs_sha1_update(context, &c, 1);
-  }
-  cs_sha1_update(context, finalcount, 8);
-  for (i = 0; i < 20; i++) {
-    digest[i] =
-        (unsigned char) ((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
-  }
-  memset(context, '\0', sizeof(*context));
-  memset(&finalcount, '\0', sizeof(finalcount));
-}
-
-void cs_hmac_sha1(const unsigned char *key, size_t keylen,
-                  const unsigned char *data, size_t datalen,
-                  unsigned char out[20]) {
-  cs_sha1_ctx ctx;
-  unsigned char buf1[64], buf2[64], tmp_key[20], i;
-
-  if (keylen > sizeof(buf1)) {
-    cs_sha1_init(&ctx);
-    cs_sha1_update(&ctx, key, keylen);
-    cs_sha1_final(tmp_key, &ctx);
-    key = tmp_key;
-    keylen = sizeof(tmp_key);
-  }
-
-  memset(buf1, 0, sizeof(buf1));
-  memset(buf2, 0, sizeof(buf2));
-  memcpy(buf1, key, keylen);
-  memcpy(buf2, key, keylen);
-
-  for (i = 0; i < sizeof(buf1); i++) {
-    buf1[i] ^= 0x36;
-    buf2[i] ^= 0x5c;
-  }
-
-  cs_sha1_init(&ctx);
-  cs_sha1_update(&ctx, buf1, sizeof(buf1));
-  cs_sha1_update(&ctx, data, datalen);
-  cs_sha1_final(out, &ctx);
-
-  cs_sha1_init(&ctx);
-  cs_sha1_update(&ctx, buf2, sizeof(buf2));
-  cs_sha1_update(&ctx, out, 20);
-  cs_sha1_final(out, &ctx);
-}
-
-#endif /* EXCLUDE_COMMON */
-#ifdef MG_MODULE_LINES
-#line 1 "common/mbuf.c"
-#endif
-
-#ifndef EXCLUDE_COMMON
-
-#include <assert.h>
-#include <string.h>
-/* Amalgamated: #include "common/mbuf.h" */
-
-#ifndef MBUF_REALLOC
-#define MBUF_REALLOC realloc
-#endif
-
-#ifndef MBUF_FREE
-#define MBUF_FREE free
-#endif
-
-void mbuf_init(struct mbuf *mbuf, size_t initial_size) WEAK;
-void mbuf_init(struct mbuf *mbuf, size_t initial_size) {
-  mbuf->len = mbuf->size = 0;
-  mbuf->buf = NULL;
-  mbuf_resize(mbuf, initial_size);
-}
-
-void mbuf_free(struct mbuf *mbuf) WEAK;
-void mbuf_free(struct mbuf *mbuf) {
-  if (mbuf->buf != NULL) {
-    MBUF_FREE(mbuf->buf);
-    mbuf_init(mbuf, 0);
-  }
-}
-
-void mbuf_resize(struct mbuf *a, size_t new_size) WEAK;
-void mbuf_resize(struct mbuf *a, size_t new_size) {
-  if (new_size > a->size || (new_size < a->size && new_size >= a->len)) {
-    char *buf = (char *) MBUF_REALLOC(a->buf, new_size);
-    /*
-     * In case realloc fails, there's not much we can do, except keep things as
-     * they are. Note that NULL is a valid return value from realloc when
-     * size == 0, but that is covered too.
-     */
-    if (buf == NULL && new_size != 0) return;
-    a->buf = buf;
-    a->size = new_size;
-  }
-}
-
-void mbuf_trim(struct mbuf *mbuf) WEAK;
-void mbuf_trim(struct mbuf *mbuf) {
-  mbuf_resize(mbuf, mbuf->len);
-}
-
-size_t mbuf_insert(struct mbuf *a, size_t off, const void *buf, size_t) WEAK;
-size_t mbuf_insert(struct mbuf *a, size_t off, const void *buf, size_t len) {
-  char *p = NULL;
-
-  assert(a != NULL);
-  assert(a->len <= a->size);
-  assert(off <= a->len);
-
-  /* check overflow */
-  if (~(size_t) 0 - (size_t) a->buf < len) return 0;
-
-  if (a->len + len <= a->size) {
-    memmove(a->buf + off + len, a->buf + off, a->len - off);
-    if (buf != NULL) {
-      memcpy(a->buf + off, buf, len);
-    }
-    a->len += len;
-  } else {
-    size_t min_size = (a->len + len);
-    size_t new_size = (size_t)(min_size * MBUF_SIZE_MULTIPLIER);
-    if (new_size - min_size > MBUF_SIZE_MAX_HEADROOM) {
-      new_size = min_size + MBUF_SIZE_MAX_HEADROOM;
-    }
-    p = (char *) MBUF_REALLOC(a->buf, new_size);
-    if (p == NULL && new_size != min_size) {
-      new_size = min_size;
-      p = (char *) MBUF_REALLOC(a->buf, new_size);
-    }
-    if (p != NULL) {
-      a->buf = p;
-      if (off != a->len) {
-        memmove(a->buf + off + len, a->buf + off, a->len - off);
-      }
-      if (buf != NULL) memcpy(a->buf + off, buf, len);
-      a->len += len;
-      a->size = new_size;
-    } else {
-      len = 0;
-    }
-  }
-
-  return len;
-}
-
-size_t mbuf_append(struct mbuf *a, const void *buf, size_t len) WEAK;
-size_t mbuf_append(struct mbuf *a, const void *buf, size_t len) {
-  return mbuf_insert(a, a->len, buf, len);
-}
-
-size_t mbuf_append_and_free(struct mbuf *a, void *buf, size_t len) WEAK;
-size_t mbuf_append_and_free(struct mbuf *a, void *data, size_t len) {
-  size_t ret;
-  /* Optimization: if the buffer is currently empty,
-   * take over the user-provided buffer. */
-  if (a->len == 0) {
-    if (a->buf != NULL) free(a->buf);
-    a->buf = (char *) data;
-    a->len = a->size = len;
-    return len;
-  }
-  ret = mbuf_insert(a, a->len, data, len);
-  free(data);
-  return ret;
-}
-
-void mbuf_remove(struct mbuf *mb, size_t n) WEAK;
-void mbuf_remove(struct mbuf *mb, size_t n) {
-  if (n > 0 && n <= mb->len) {
-    memmove(mb->buf, mb->buf + n, mb->len - n);
-    mb->len -= n;
-  }
-}
-
-void mbuf_clear(struct mbuf *mb) WEAK;
-void mbuf_clear(struct mbuf *mb) {
-  mb->len = 0;
-}
-
-void mbuf_move(struct mbuf *from, struct mbuf *to) WEAK;
-void mbuf_move(struct mbuf *from, struct mbuf *to) {
-  memcpy(to, from, sizeof(*to));
-  memset(from, 0, sizeof(*from));
-}
-
-#endif /* EXCLUDE_COMMON */
-#ifdef MG_MODULE_LINES
-#line 1 "common/mg_str.c"
-#endif
-
-/* Amalgamated: #include "common/mg_mem.h" */
-/* Amalgamated: #include "common/mg_str.h" */
-/* Amalgamated: #include "common/platform.h" */
-
-#include <ctype.h>
-#include <stdlib.h>
-#include <string.h>
-
-int mg_ncasecmp(const char *s1, const char *s2, size_t len) WEAK;
-
-struct mg_str mg_mk_str(const char *s) WEAK;
-struct mg_str mg_mk_str(const char *s) {
-  struct mg_str ret = {s, 0};
-  if (s != NULL) ret.len = strlen(s);
-  return ret;
-}
-
-struct mg_str mg_mk_str_n(const char *s, size_t len) WEAK;
-struct mg_str mg_mk_str_n(const char *s, size_t len) {
-  struct mg_str ret = {s, len};
-  return ret;
-}
-
-int mg_vcmp(const struct mg_str *str1, const char *str2) WEAK;
-int mg_vcmp(const struct mg_str *str1, const char *str2) {
-  size_t n2 = strlen(str2), n1 = str1->len;
-  int r = strncmp(str1->p, str2, (n1 < n2) ? n1 : n2);
-  if (r == 0) {
-    return n1 - n2;
-  }
-  return r;
-}
-
-int mg_vcasecmp(const struct mg_str *str1, const char *str2) WEAK;
-int mg_vcasecmp(const struct mg_str *str1, const char *str2) {
-  size_t n2 = strlen(str2), n1 = str1->len;
-  int r = mg_ncasecmp(str1->p, str2, (n1 < n2) ? n1 : n2);
-  if (r == 0) {
-    return n1 - n2;
-  }
-  return r;
-}
-
-static struct mg_str mg_strdup_common(const struct mg_str s,
-                                      int nul_terminate) {
-  struct mg_str r = {NULL, 0};
-  if (s.len > 0 && s.p != NULL) {
-    char *sc = (char *) MG_MALLOC(s.len + (nul_terminate ? 1 : 0));
-    if (sc != NULL) {
-      memcpy(sc, s.p, s.len);
-      if (nul_terminate) sc[s.len] = '\0';
-      r.p = sc;
-      r.len = s.len;
-    }
-  }
-  return r;
-}
-
-struct mg_str mg_strdup(const struct mg_str s) WEAK;
-struct mg_str mg_strdup(const struct mg_str s) {
-  return mg_strdup_common(s, 0 /* NUL-terminate */);
-}
-
-struct mg_str mg_strdup_nul(const struct mg_str s) WEAK;
-struct mg_str mg_strdup_nul(const struct mg_str s) {
-  return mg_strdup_common(s, 1 /* NUL-terminate */);
-}
-
-const char *mg_strchr(const struct mg_str s, int c) WEAK;
-const char *mg_strchr(const struct mg_str s, int c) {
-  size_t i;
-  for (i = 0; i < s.len; i++) {
-    if (s.p[i] == c) return &s.p[i];
-  }
-  return NULL;
-}
-
-int mg_strcmp(const struct mg_str str1, const struct mg_str str2) WEAK;
-int mg_strcmp(const struct mg_str str1, const struct mg_str str2) {
-  size_t i = 0;
-  while (i < str1.len && i < str2.len) {
-    int c1 = str1.p[i];
-    int c2 = str2.p[i];
-    if (c1 < c2) return -1;
-    if (c1 > c2) return 1;
-    i++;
-  }
-  if (i < str1.len) return 1;
-  if (i < str2.len) return -1;
-  return 0;
-}
-
-int mg_strncmp(const struct mg_str, const struct mg_str, size_t n) WEAK;
-int mg_strncmp(const struct mg_str str1, const struct mg_str str2, size_t n) {
-  struct mg_str s1 = str1;
-  struct mg_str s2 = str2;
-
-  if (s1.len > n) {
-    s1.len = n;
-  }
-  if (s2.len > n) {
-    s2.len = n;
-  }
-  return mg_strcmp(s1, s2);
-}
-
-int mg_strcasecmp(const struct mg_str str1, const struct mg_str str2) WEAK;
-int mg_strcasecmp(const struct mg_str str1, const struct mg_str str2) {
-  size_t i = 0;
-  while (i < str1.len && i < str2.len) {
-    int c1 = tolower((int) str1.p[i]);
-    int c2 = tolower((int) str2.p[i]);
-    if (c1 < c2) return -1;
-    if (c1 > c2) return 1;
-    i++;
-  }
-  if (i < str1.len) return 1;
-  if (i < str2.len) return -1;
-  return 0;
-}
-
-void mg_strfree(struct mg_str *s) WEAK;
-void mg_strfree(struct mg_str *s) {
-  char *sp = (char *) s->p;
-  s->p = NULL;
-  s->len = 0;
-  if (sp != NULL) free(sp);
-}
-
-const char *mg_strstr(const struct mg_str haystack,
-                      const struct mg_str needle) WEAK;
-const char *mg_strstr(const struct mg_str haystack,
-                      const struct mg_str needle) {
-  size_t i;
-  if (needle.len > haystack.len) return NULL;
-  for (i = 0; i <= haystack.len - needle.len; i++) {
-    if (memcmp(haystack.p + i, needle.p, needle.len) == 0) {
-      return haystack.p + i;
-    }
-  }
-  return NULL;
-}
-
-struct mg_str mg_strstrip(struct mg_str s) WEAK;
-struct mg_str mg_strstrip(struct mg_str s) {
-  while (s.len > 0 && isspace((int) *s.p)) {
-    s.p++;
-    s.len--;
-  }
-  while (s.len > 0 && isspace((int) *(s.p + s.len - 1))) {
-    s.len--;
-  }
-  return s;
-}
-
-int mg_str_starts_with(struct mg_str s, struct mg_str prefix) WEAK;
-int mg_str_starts_with(struct mg_str s, struct mg_str prefix) {
-  const struct mg_str sp = MG_MK_STR_N(s.p, prefix.len);
-  if (s.len < prefix.len) return 0;
-  return (mg_strcmp(sp, prefix) == 0);
-}
-#ifdef MG_MODULE_LINES
-#line 1 "common/str_util.c"
-#endif
-
-#ifndef EXCLUDE_COMMON
-
-/* Amalgamated: #include "common/str_util.h" */
-/* Amalgamated: #include "common/mg_mem.h" */
-/* Amalgamated: #include "common/platform.h" */
-
-#ifndef C_DISABLE_BUILTIN_SNPRINTF
-#define C_DISABLE_BUILTIN_SNPRINTF 0
-#endif
-
-/* Amalgamated: #include "common/mg_mem.h" */
-
-size_t c_strnlen(const char *s, size_t maxlen) WEAK;
-size_t c_strnlen(const char *s, size_t maxlen) {
-  size_t l = 0;
-  for (; l < maxlen && s[l] != '\0'; l++) {
-  }
-  return l;
-}
-
-#define C_SNPRINTF_APPEND_CHAR(ch)       \
-  do {                                   \
-    if (i < (int) buf_size) buf[i] = ch; \
-    i++;                                 \
-  } while (0)
-
-#define C_SNPRINTF_FLAG_ZERO 1
-
-#if C_DISABLE_BUILTIN_SNPRINTF
-int c_vsnprintf(char *buf, size_t buf_size, const char *fmt, va_list ap) WEAK;
-int c_vsnprintf(char *buf, size_t buf_size, const char *fmt, va_list ap) {
-  return vsnprintf(buf, buf_size, fmt, ap);
-}
-#else
-static int c_itoa(char *buf, size_t buf_size, int64_t num, int base, int flags,
-                  int field_width) {
-  char tmp[40];
-  int i = 0, k = 0, neg = 0;
-
-  if (num < 0) {
-    neg++;
-    num = -num;
-  }
-
-  /* Print into temporary buffer - in reverse order */
-  do {
-    int rem = num % base;
-    if (rem < 10) {
-      tmp[k++] = '0' + rem;
-    } else {
-      tmp[k++] = 'a' + (rem - 10);
-    }
-    num /= base;
-  } while (num > 0);
-
-  /* Zero padding */
-  if (flags && C_SNPRINTF_FLAG_ZERO) {
-    while (k < field_width && k < (int) sizeof(tmp) - 1) {
-      tmp[k++] = '0';
-    }
-  }
-
-  /* And sign */
-  if (neg) {
-    tmp[k++] = '-';
-  }
-
-  /* Now output */
-  while (--k >= 0) {
-    C_SNPRINTF_APPEND_CHAR(tmp[k]);
-  }
-
-  return i;
-}
-
-int c_vsnprintf(char *buf, size_t buf_size, const char *fmt, va_list ap) WEAK;
-int c_vsnprintf(char *buf, size_t buf_size, const char *fmt, va_list ap) {
-  int ch, i = 0, len_mod, flags, precision, field_width;
-
-  while ((ch = *fmt++) != '\0') {
-    if (ch != '%') {
-      C_SNPRINTF_APPEND_CHAR(ch);
-    } else {
-      /*
-       * Conversion specification:
-       *   zero or more flags (one of: # 0 - <space> + ')
-       *   an optional minimum  field  width (digits)
-       *   an  optional precision (. followed by digits, or *)
-       *   an optional length modifier (one of: hh h l ll L q j z t)
-       *   conversion specifier (one of: d i o u x X e E f F g G a A c s p n)
-       */
-      flags = field_width = precision = len_mod = 0;
-
-      /* Flags. only zero-pad flag is supported. */
-      if (*fmt == '0') {
-        flags |= C_SNPRINTF_FLAG_ZERO;
-      }
-
-      /* Field width */
-      while (*fmt >= '0' && *fmt <= '9') {
-        field_width *= 10;
-        field_width += *fmt++ - '0';
-      }
-      /* Dynamic field width */
-      if (*fmt == '*') {
-        field_width = va_arg(ap, int);
-        fmt++;
-      }
-
-      /* Precision */
-      if (*fmt == '.') {
-        fmt++;
-        if (*fmt == '*') {
-          precision = va_arg(ap, int);
-          fmt++;
-        } else {
-          while (*fmt >= '0' && *fmt <= '9') {
-            precision *= 10;
-            precision += *fmt++ - '0';
-          }
-        }
-      }
-
-      /* Length modifier */
-      switch (*fmt) {
-        case 'h':
-        case 'l':
-        case 'L':
-        case 'I':
-        case 'q':
-        case 'j':
-        case 'z':
-        case 't':
-          len_mod = *fmt++;
-          if (*fmt == 'h') {
-            len_mod = 'H';
-            fmt++;
-          }
-          if (*fmt == 'l') {
-            len_mod = 'q';
-            fmt++;
-          }
-          break;
-      }
-
-      ch = *fmt++;
-      if (ch == 's') {
-        const char *s = va_arg(ap, const char *); /* Always fetch parameter */
-        int j;
-        int pad = field_width - (precision >= 0 ? c_strnlen(s, precision) : 0);
-        for (j = 0; j < pad; j++) {
-          C_SNPRINTF_APPEND_CHAR(' ');
-        }
-
-        /* `s` may be NULL in case of %.*s */
-        if (s != NULL) {
-          /* Ignore negative and 0 precisions */
-          for (j = 0; (precision <= 0 || j < precision) && s[j] != '\0'; j++) {
-            C_SNPRINTF_APPEND_CHAR(s[j]);
-          }
-        }
-      } else if (ch == 'c') {
-        ch = va_arg(ap, int); /* Always fetch parameter */
-        C_SNPRINTF_APPEND_CHAR(ch);
-      } else if (ch == 'd' && len_mod == 0) {
-        i += c_itoa(buf + i, buf_size - i, va_arg(ap, int), 10, flags,
-                    field_width);
-      } else if (ch == 'd' && len_mod == 'l') {
-        i += c_itoa(buf + i, buf_size - i, va_arg(ap, long), 10, flags,
-                    field_width);
-#ifdef SSIZE_MAX
-      } else if (ch == 'd' && len_mod == 'z') {
-        i += c_itoa(buf + i, buf_size - i, va_arg(ap, ssize_t), 10, flags,
-                    field_width);
-#endif
-      } else if (ch == 'd' && len_mod == 'q') {
-        i += c_itoa(buf + i, buf_size - i, va_arg(ap, int64_t), 10, flags,
-                    field_width);
-      } else if ((ch == 'x' || ch == 'u') && len_mod == 0) {
-        i += c_itoa(buf + i, buf_size - i, va_arg(ap, unsigned),
-                    ch == 'x' ? 16 : 10, flags, field_width);
-      } else if ((ch == 'x' || ch == 'u') && len_mod == 'l') {
-        i += c_itoa(buf + i, buf_size - i, va_arg(ap, unsigned long),
-                    ch == 'x' ? 16 : 10, flags, field_width);
-      } else if ((ch == 'x' || ch == 'u') && len_mod == 'z') {
-        i += c_itoa(buf + i, buf_size - i, va_arg(ap, size_t),
-                    ch == 'x' ? 16 : 10, flags, field_width);
-      } else if (ch == 'p') {
-        unsigned long num = (unsigned long) (uintptr_t) va_arg(ap, void *);
-        C_SNPRINTF_APPEND_CHAR('0');
-        C_SNPRINTF_APPEND_CHAR('x');
-        i += c_itoa(buf + i, buf_size - i, num, 16, flags, 0);
-      } else {
-#ifndef NO_LIBC
-        /*
-         * TODO(lsm): abort is not nice in a library, remove it
-         * Also, ESP8266 SDK doesn't have it
-         */
-        abort();
-#endif
-      }
-    }
-  }
-
-  /* Zero-terminate the result */
-  if (buf_size > 0) {
-    buf[i < (int) buf_size ? i : (int) buf_size - 1] = '\0';
-  }
-
-  return i;
-}
-#endif
-
-int c_snprintf(char *buf, size_t buf_size, const char *fmt, ...) WEAK;
-int c_snprintf(char *buf, size_t buf_size, const char *fmt, ...) {
-  int result;
-  va_list ap;
-  va_start(ap, fmt);
-  result = c_vsnprintf(buf, buf_size, fmt, ap);
-  va_end(ap);
-  return result;
-}
-
-#ifdef _WIN32
-int to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len) {
-  int ret;
-  char buf[MAX_PATH * 2], buf2[MAX_PATH * 2], *p;
-
-  strncpy(buf, path, sizeof(buf));
-  buf[sizeof(buf) - 1] = '\0';
-
-  /* Trim trailing slashes. Leave backslash for paths like "X:\" */
-  p = buf + strlen(buf) - 1;
-  while (p > buf && p[-1] != ':' && (p[0] == '\\' || p[0] == '/')) *p-- = '\0';
-
-  memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
-  ret = MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
-
-  /*
-   * Convert back to Unicode. If doubly-converted string does not match the
-   * original, something is fishy, reject.
-   */
-  WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
-                      NULL, NULL);
-  if (strcmp(buf, buf2) != 0) {
-    wbuf[0] = L'\0';
-    ret = 0;
-  }
-
-  return ret;
-}
-#endif /* _WIN32 */
-
-/* The simplest O(mn) algorithm. Better implementation are GPLed */
-const char *c_strnstr(const char *s, const char *find, size_t slen) WEAK;
-const char *c_strnstr(const char *s, const char *find, size_t slen) {
-  size_t find_length = strlen(find);
-  size_t i;
-
-  for (i = 0; i < slen; i++) {
-    if (i + find_length > slen) {
-      return NULL;
-    }
-
-    if (strncmp(&s[i], find, find_length) == 0) {
-      return &s[i];
-    }
-  }
-
-  return NULL;
-}
-
-#if CS_ENABLE_STRDUP
-char *strdup(const char *src) WEAK;
-char *strdup(const char *src) {
-  size_t len = strlen(src) + 1;
-  char *ret = MG_MALLOC(len);
-  if (ret != NULL) {
-    strcpy(ret, src);
-  }
-  return ret;
-}
-#endif
-
-void cs_to_hex(char *to, const unsigned char *p, size_t len) WEAK;
-void cs_to_hex(char *to, const unsigned char *p, size_t len) {
-  static const char *hex = "0123456789abcdef";
-
-  for (; len--; p++) {
-    *to++ = hex[p[0] >> 4];
-    *to++ = hex[p[0] & 0x0f];
-  }
-  *to = '\0';
-}
-
-static int fourbit(int ch) {
-  if (ch >= '0' && ch <= '9') {
-    return ch - '0';
-  } else if (ch >= 'a' && ch <= 'f') {
-    return ch - 'a' + 10;
-  } else if (ch >= 'A' && ch <= 'F') {
-    return ch - 'A' + 10;
-  }
-  return 0;
-}
-
-void cs_from_hex(char *to, const char *p, size_t len) WEAK;
-void cs_from_hex(char *to, const char *p, size_t len) {
-  size_t i;
-
-  for (i = 0; i < len; i += 2) {
-    *to++ = (fourbit(p[i]) << 4) + fourbit(p[i + 1]);
-  }
-  *to = '\0';
-}
-
-#if CS_ENABLE_TO64
-int64_t cs_to64(const char *s) WEAK;
-int64_t cs_to64(const char *s) {
-  int64_t result = 0;
-  int64_t neg = 1;
-  while (*s && isspace((unsigned char) *s)) s++;
-  if (*s == '-') {
-    neg = -1;
-    s++;
-  }
-  while (isdigit((unsigned char) *s)) {
-    result *= 10;
-    result += (*s - '0');
-    s++;
-  }
-  return result * neg;
-}
-#endif
-
-static int str_util_lowercase(const char *s) {
-  return tolower(*(const unsigned char *) s);
-}
-
-int mg_ncasecmp(const char *s1, const char *s2, size_t len) WEAK;
-int mg_ncasecmp(const char *s1, const char *s2, size_t len) {
-  int diff = 0;
-
-  if (len > 0) do {
-      diff = str_util_lowercase(s1++) - str_util_lowercase(s2++);
-    } while (diff == 0 && s1[-1] != '\0' && --len > 0);
-
-  return diff;
-}
-
-int mg_casecmp(const char *s1, const char *s2) WEAK;
-int mg_casecmp(const char *s1, const char *s2) {
-  return mg_ncasecmp(s1, s2, (size_t) ~0);
-}
-
-int mg_asprintf(char **buf, size_t size, const char *fmt, ...) WEAK;
-int mg_asprintf(char **buf, size_t size, const char *fmt, ...) {
-  int ret;
-  va_list ap;
-  va_start(ap, fmt);
-  ret = mg_avprintf(buf, size, fmt, ap);
-  va_end(ap);
-  return ret;
-}
-
-int mg_avprintf(char **buf, size_t size, const char *fmt, va_list ap) WEAK;
-int mg_avprintf(char **buf, size_t size, const char *fmt, va_list ap) {
-  va_list ap_copy;
-  int len;
-
-  va_copy(ap_copy, ap);
-  len = vsnprintf(*buf, size, fmt, ap_copy);
-  va_end(ap_copy);
-
-  if (len < 0) {
-    /* eCos and Windows are not standard-compliant and return -1 when
-     * the buffer is too small. Keep allocating larger buffers until we
-     * succeed or out of memory. */
-    *buf = NULL; /* LCOV_EXCL_START */
-    while (len < 0) {
-      MG_FREE(*buf);
-      if (size == 0) {
-        size = 5;
-      }
-      size *= 2;
-      if ((*buf = (char *) MG_MALLOC(size)) == NULL) {
-        len = -1;
-        break;
-      }
-      va_copy(ap_copy, ap);
-      len = vsnprintf(*buf, size - 1, fmt, ap_copy);
-      va_end(ap_copy);
-    }
-
-    /*
-     * Microsoft version of vsnprintf() is not always null-terminated, so put
-     * the terminator manually
-     */
-    (*buf)[len] = 0;
-    /* LCOV_EXCL_STOP */
-  } else if (len >= (int) size) {
-    /* Standard-compliant code path. Allocate a buffer that is large enough. */
-    if ((*buf = (char *) MG_MALLOC(len + 1)) == NULL) {
-      len = -1; /* LCOV_EXCL_LINE */
-    } else {    /* LCOV_EXCL_LINE */
-      va_copy(ap_copy, ap);
-      len = vsnprintf(*buf, len + 1, fmt, ap_copy);
-      va_end(ap_copy);
-    }
-  }
-
-  return len;
-}
-
-const char *mg_next_comma_list_entry(const char *, struct mg_str *,
-                                     struct mg_str *) WEAK;
-const char *mg_next_comma_list_entry(const char *list, struct mg_str *val,
-                                     struct mg_str *eq_val) {
-  struct mg_str ret = mg_next_comma_list_entry_n(mg_mk_str(list), val, eq_val);
-  return ret.p;
-}
-
-struct mg_str mg_next_comma_list_entry_n(struct mg_str list, struct mg_str *val,
-                                         struct mg_str *eq_val) WEAK;
-struct mg_str mg_next_comma_list_entry_n(struct mg_str list, struct mg_str *val,
-                                         struct mg_str *eq_val) {
-  if (list.len == 0) {
-    /* End of the list */
-    list = mg_mk_str(NULL);
-  } else {
-    const char *chr = NULL;
-    *val = list;
-
-    if ((chr = mg_strchr(*val, ',')) != NULL) {
-      /* Comma found. Store length and shift the list ptr */
-      val->len = chr - val->p;
-      chr++;
-      list.len -= (chr - list.p);
-      list.p = chr;
-    } else {
-      /* This value is the last one */
-      list = mg_mk_str_n(list.p + list.len, 0);
-    }
-
-    if (eq_val != NULL) {
-      /* Value has form "x=y", adjust pointers and lengths */
-      /* so that val points to "x", and eq_val points to "y". */
-      eq_val->len = 0;
-      eq_val->p = (const char *) memchr(val->p, '=', val->len);
-      if (eq_val->p != NULL) {
-        eq_val->p++; /* Skip over '=' character */
-        eq_val->len = val->p + val->len - eq_val->p;
-        val->len = (eq_val->p - val->p) - 1;
-      }
-    }
-  }
-
-  return list;
-}
-
-size_t mg_match_prefix_n(const struct mg_str, const struct mg_str) WEAK;
-size_t mg_match_prefix_n(const struct mg_str pattern, const struct mg_str str) {
-  const char *or_str;
-  size_t res = 0, len = 0, i = 0, j = 0;
-
-  if ((or_str = (const char *) memchr(pattern.p, '|', pattern.len)) != NULL ||
-      (or_str = (const char *) memchr(pattern.p, ',', pattern.len)) != NULL) {
-    struct mg_str pstr = {pattern.p, (size_t)(or_str - pattern.p)};
-    res = mg_match_prefix_n(pstr, str);
-    if (res > 0) return res;
-    pstr.p = or_str + 1;
-    pstr.len = (pattern.p + pattern.len) - (or_str + 1);
-    return mg_match_prefix_n(pstr, str);
-  }
-
-  for (; i < pattern.len && j < str.len; i++, j++) {
-    if (pattern.p[i] == '?') {
-      continue;
-    } else if (pattern.p[i] == '*') {
-      i++;
-      if (i < pattern.len && pattern.p[i] == '*') {
-        i++;
-        len = str.len - j;
-      } else {
-        len = 0;
-        while (j + len < str.len && str.p[j + len] != '/') len++;
-      }
-      if (i == pattern.len || (pattern.p[i] == '$' && i == pattern.len - 1))
-        return j + len;
-      do {
-        const struct mg_str pstr = {pattern.p + i, pattern.len - i};
-        const struct mg_str sstr = {str.p + j + len, str.len - j - len};
-        res = mg_match_prefix_n(pstr, sstr);
-      } while (res == 0 && len != 0 && len-- > 0);
-      return res == 0 ? 0 : j + res + len;
-    } else if (str_util_lowercase(&pattern.p[i]) !=
-               str_util_lowercase(&str.p[j])) {
-      break;
-    }
-  }
-  if (i < pattern.len && pattern.p[i] == '$') {
-    return j == str.len ? str.len : 0;
-  }
-  return i == pattern.len ? j : 0;
-}
-
-size_t mg_match_prefix(const char *, int, const char *) WEAK;
-size_t mg_match_prefix(const char *pattern, int pattern_len, const char *str) {
-  const struct mg_str pstr = {pattern, (size_t) pattern_len};
-  struct mg_str s = {str, 0};
-  if (str != NULL) s.len = strlen(str);
-  return mg_match_prefix_n(pstr, s);
-}
-
-#endif /* EXCLUDE_COMMON */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_net.c"
-#endif
-
-/* Amalgamated: #include "common/cs_time.h" */
-/* Amalgamated: #include "mg_dns.h" */
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_resolv.h" */
-/* Amalgamated: #include "mg_util.h" */
-
-#define MG_MAX_HOST_LEN 200
-
-#ifndef MG_TCP_IO_SIZE
-#define MG_TCP_IO_SIZE 1460
-#endif
-#ifndef MG_UDP_IO_SIZE
-#define MG_UDP_IO_SIZE 1460
-#endif
-
-#define MG_COPY_COMMON_CONNECTION_OPTIONS(dst, src) \
-  memcpy(dst, src, sizeof(*dst));
-
-/* Which flags can be pre-set by the user at connection creation time. */
-#define _MG_ALLOWED_CONNECT_FLAGS_MASK                                   \
-  (MG_F_USER_1 | MG_F_USER_2 | MG_F_USER_3 | MG_F_USER_4 | MG_F_USER_5 | \
-   MG_F_USER_6 | MG_F_WEBSOCKET_NO_DEFRAG | MG_F_ENABLE_BROADCAST)
-/* Which flags should be modifiable by user's callbacks. */
-#define _MG_CALLBACK_MODIFIABLE_FLAGS_MASK                               \
-  (MG_F_USER_1 | MG_F_USER_2 | MG_F_USER_3 | MG_F_USER_4 | MG_F_USER_5 | \
-   MG_F_USER_6 | MG_F_WEBSOCKET_NO_DEFRAG | MG_F_SEND_AND_CLOSE |        \
-   MG_F_CLOSE_IMMEDIATELY | MG_F_IS_WEBSOCKET | MG_F_DELETE_CHUNK)
-
-#ifndef intptr_t
-#define intptr_t long
-#endif
-
-MG_INTERNAL void mg_add_conn(struct mg_mgr *mgr, struct mg_connection *c) {
-  DBG(("%p %p", mgr, c));
-  c->mgr = mgr;
-  c->next = mgr->active_connections;
-  mgr->active_connections = c;
-  c->prev = NULL;
-  if (c->next != NULL) c->next->prev = c;
-  if (c->sock != INVALID_SOCKET) {
-    c->iface->vtable->add_conn(c);
-  }
-}
-
-MG_INTERNAL void mg_remove_conn(struct mg_connection *conn) {
-  if (conn->prev == NULL) conn->mgr->active_connections = conn->next;
-  if (conn->prev) conn->prev->next = conn->next;
-  if (conn->next) conn->next->prev = conn->prev;
-  conn->prev = conn->next = NULL;
-  conn->iface->vtable->remove_conn(conn);
-}
-
-MG_INTERNAL void mg_call(struct mg_connection *nc,
-                         mg_event_handler_t ev_handler, void *user_data, int ev,
-                         void *ev_data) {
-  if (ev_handler == NULL) {
-    /*
-     * If protocol handler is specified, call it. Otherwise, call user-specified
-     * event handler.
-     */
-    ev_handler = nc->proto_handler ? nc->proto_handler : nc->handler;
-  }
-  if (ev != MG_EV_POLL) {
-    DBG(("%p %s ev=%d ev_data=%p flags=0x%lx rmbl=%d smbl=%d", nc,
-         ev_handler == nc->handler ? "user" : "proto", ev, ev_data, nc->flags,
-         (int) nc->recv_mbuf.len, (int) nc->send_mbuf.len));
-  }
-
-#if !defined(NO_LIBC) && MG_ENABLE_HEXDUMP
-  if (nc->mgr->hexdump_file != NULL && ev != MG_EV_POLL && ev != MG_EV_RECV &&
-      ev != MG_EV_SEND /* handled separately */) {
-    mg_hexdump_connection(nc, nc->mgr->hexdump_file, NULL, 0, ev);
-  }
-#endif
-  if (ev_handler != NULL) {
-    unsigned long flags_before = nc->flags;
-    ev_handler(nc, ev, ev_data MG_UD_ARG(user_data));
-    /* Prevent user handler from fiddling with system flags. */
-    if (ev_handler == nc->handler && nc->flags != flags_before) {
-      nc->flags = (flags_before & ~_MG_CALLBACK_MODIFIABLE_FLAGS_MASK) |
-                  (nc->flags & _MG_CALLBACK_MODIFIABLE_FLAGS_MASK);
-    }
-  }
-  if (ev != MG_EV_POLL) nc->mgr->num_calls++;
-  if (ev != MG_EV_POLL) {
-    DBG(("%p after %s flags=0x%lx rmbl=%d smbl=%d", nc,
-         ev_handler == nc->handler ? "user" : "proto", nc->flags,
-         (int) nc->recv_mbuf.len, (int) nc->send_mbuf.len));
-  }
-#if !MG_ENABLE_CALLBACK_USERDATA
-  (void) user_data;
-#endif
-}
-
-MG_INTERNAL void mg_timer(struct mg_connection *c, double now) {
-  if (c->ev_timer_time > 0 && now >= c->ev_timer_time) {
-    double old_value = c->ev_timer_time;
-    c->ev_timer_time = 0;
-    mg_call(c, NULL, c->user_data, MG_EV_TIMER, &old_value);
-  }
-}
-
-MG_INTERNAL size_t recv_avail_size(struct mg_connection *conn, size_t max) {
-  size_t avail;
-  if (conn->recv_mbuf_limit < conn->recv_mbuf.len) return 0;
-  avail = conn->recv_mbuf_limit - conn->recv_mbuf.len;
-  return avail > max ? max : avail;
-}
-
-static int mg_do_recv(struct mg_connection *nc);
-
-int mg_if_poll(struct mg_connection *nc, double now) {
-  if (nc->flags & MG_F_CLOSE_IMMEDIATELY) {
-    mg_close_conn(nc);
-    return 0;
-  } else if (nc->flags & MG_F_SEND_AND_CLOSE) {
-    if (nc->send_mbuf.len == 0) {
-      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      mg_close_conn(nc);
-      return 0;
-    }
-  } else if (nc->flags & MG_F_RECV_AND_CLOSE) {
-    mg_close_conn(nc);
-    return 0;
-  }
-#if MG_ENABLE_SSL
-  if ((nc->flags & (MG_F_SSL | MG_F_LISTENING | MG_F_CONNECTING)) == MG_F_SSL) {
-    /* SSL library may have data to be delivered to the app in its buffers,
-     * drain them. */
-    int recved = 0;
-    do {
-      if (nc->flags & (MG_F_WANT_READ | MG_F_WANT_WRITE)) break;
-      if (recv_avail_size(nc, MG_TCP_IO_SIZE) <= 0) break;
-      recved = mg_do_recv(nc);
-    } while (recved > 0);
-  }
-#endif /* MG_ENABLE_SSL */
-  mg_timer(nc, now);
-  {
-    time_t now_t = (time_t) now;
-    mg_call(nc, NULL, nc->user_data, MG_EV_POLL, &now_t);
-  }
-  return 1;
-}
-
-static void mg_destroy_conn(struct mg_connection *conn, int destroy_if) {
-  if (conn->sock != INVALID_SOCKET) { /* Don't print timer-only conns */
-    LOG(LL_DEBUG, ("%p 0x%lx %d", conn, conn->flags, destroy_if));
-  }
-  if (destroy_if) conn->iface->vtable->destroy_conn(conn);
-  if (conn->proto_data != NULL && conn->proto_data_destructor != NULL) {
-    conn->proto_data_destructor(conn->proto_data);
-  }
-#if MG_ENABLE_SSL
-  mg_ssl_if_conn_free(conn);
-#endif
-  mbuf_free(&conn->recv_mbuf);
-  mbuf_free(&conn->send_mbuf);
-
-  memset(conn, 0, sizeof(*conn));
-  MG_FREE(conn);
-}
-
-void mg_close_conn(struct mg_connection *conn) {
-  /* See if there's any remaining data to deliver. Skip if user completely
-   * throttled the connection there will be no progress anyway. */
-  if (conn->sock != INVALID_SOCKET && mg_do_recv(conn) == -2) {
-    /* Receive is throttled, wait. */
-    conn->flags |= MG_F_RECV_AND_CLOSE;
-    return;
-  }
-#if MG_ENABLE_SSL
-  if (conn->flags & MG_F_SSL_HANDSHAKE_DONE) {
-    mg_ssl_if_conn_close_notify(conn);
-  }
-#endif
-  /*
-   * Clearly mark the connection as going away (if not already).
-   * Some net_if impls (LwIP) need this for cleanly handling half-dead conns.
-   */
-  conn->flags |= MG_F_CLOSE_IMMEDIATELY;
-  mg_remove_conn(conn);
-  conn->iface->vtable->destroy_conn(conn);
-  mg_call(conn, NULL, conn->user_data, MG_EV_CLOSE, NULL);
-  mg_destroy_conn(conn, 0 /* destroy_if */);
-}
-
-void mg_mgr_init(struct mg_mgr *m, void *user_data) {
-  struct mg_mgr_init_opts opts;
-  memset(&opts, 0, sizeof(opts));
-  mg_mgr_init_opt(m, user_data, opts);
-}
-
-void mg_mgr_init_opt(struct mg_mgr *m, void *user_data,
-                     struct mg_mgr_init_opts opts) {
-  memset(m, 0, sizeof(*m));
-#if MG_ENABLE_BROADCAST
-  m->ctl[0] = m->ctl[1] = INVALID_SOCKET;
-#endif
-  m->user_data = user_data;
-
-#ifdef _WIN32
-  {
-    WSADATA data;
-    WSAStartup(MAKEWORD(2, 2), &data);
-  }
-#elif defined(__unix__)
-  /* Ignore SIGPIPE signal, so if client cancels the request, it
-   * won't kill the whole process. */
-  signal(SIGPIPE, SIG_IGN);
-#endif
-
-  {
-    int i;
-    if (opts.num_ifaces == 0) {
-      opts.num_ifaces = mg_num_ifaces;
-      opts.ifaces = mg_ifaces;
-    }
-    if (opts.main_iface != NULL) {
-      opts.ifaces[MG_MAIN_IFACE] = opts.main_iface;
-    }
-    m->num_ifaces = opts.num_ifaces;
-    m->ifaces =
-        (struct mg_iface **) MG_MALLOC(sizeof(*m->ifaces) * opts.num_ifaces);
-    for (i = 0; i < opts.num_ifaces; i++) {
-      m->ifaces[i] = mg_if_create_iface(opts.ifaces[i], m);
-      m->ifaces[i]->vtable->init(m->ifaces[i]);
-    }
-  }
-  if (opts.nameserver != NULL) {
-    m->nameserver = strdup(opts.nameserver);
-  }
-  DBG(("=================================="));
-  DBG(("init mgr=%p", m));
-#if MG_ENABLE_SSL
-  {
-    static int init_done;
-    if (!init_done) {
-      mg_ssl_if_init();
-      init_done++;
-    }
-  }
-#endif
-}
-
-void mg_mgr_free(struct mg_mgr *m) {
-  struct mg_connection *conn, *tmp_conn;
-
-  DBG(("%p", m));
-  if (m == NULL) return;
-  /* Do one last poll, see https://github.com/cesanta/mongoose/issues/286 */
-  mg_mgr_poll(m, 0);
-
-#if MG_ENABLE_BROADCAST
-  if (m->ctl[0] != INVALID_SOCKET) closesocket(m->ctl[0]);
-  if (m->ctl[1] != INVALID_SOCKET) closesocket(m->ctl[1]);
-  m->ctl[0] = m->ctl[1] = INVALID_SOCKET;
-#endif
-
-  for (conn = m->active_connections; conn != NULL; conn = tmp_conn) {
-    tmp_conn = conn->next;
-    conn->flags |= MG_F_CLOSE_IMMEDIATELY;
-    mg_close_conn(conn);
-  }
-
-  {
-    int i;
-    for (i = 0; i < m->num_ifaces; i++) {
-      m->ifaces[i]->vtable->free(m->ifaces[i]);
-      MG_FREE(m->ifaces[i]);
-    }
-    MG_FREE(m->ifaces);
-  }
-
-  MG_FREE((char *) m->nameserver);
-}
-
-int mg_mgr_poll(struct mg_mgr *m, int timeout_ms) {
-  int i, num_calls_before = m->num_calls;
-
-  for (i = 0; i < m->num_ifaces; i++) {
-    m->ifaces[i]->vtable->poll(m->ifaces[i], timeout_ms);
-  }
-
-  return (m->num_calls - num_calls_before);
-}
-
-int mg_vprintf(struct mg_connection *nc, const char *fmt, va_list ap) {
-  char mem[MG_VPRINTF_BUFFER_SIZE], *buf = mem;
-  int len;
-
-  if ((len = mg_avprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
-    mg_send(nc, buf, len);
-  }
-  if (buf != mem && buf != NULL) {
-    MG_FREE(buf); /* LCOV_EXCL_LINE */
-  }               /* LCOV_EXCL_LINE */
-
-  return len;
-}
-
-int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
-  int len;
-  va_list ap;
-  va_start(ap, fmt);
-  len = mg_vprintf(conn, fmt, ap);
-  va_end(ap);
-  return len;
-}
-
-#if MG_ENABLE_SYNC_RESOLVER
-/* TODO(lsm): use non-blocking resolver */
-static int mg_resolve2(const char *host, struct in_addr *ina) {
-#if MG_ENABLE_GETADDRINFO
-  int rv = 0;
-  struct addrinfo hints, *servinfo, *p;
-  struct sockaddr_in *h = NULL;
-  memset(&hints, 0, sizeof hints);
-  hints.ai_family = AF_INET;
-  hints.ai_socktype = SOCK_STREAM;
-  if ((rv = getaddrinfo(host, NULL, NULL, &servinfo)) != 0) {
-    DBG(("getaddrinfo(%s) failed: %s", host, strerror(mg_get_errno())));
-    return 0;
-  }
-  for (p = servinfo; p != NULL; p = p->ai_next) {
-    memcpy(&h, &p->ai_addr, sizeof(h));
-    memcpy(ina, &h->sin_addr, sizeof(*ina));
-  }
-  freeaddrinfo(servinfo);
-  return 1;
-#else
-  struct hostent *he;
-  if ((he = gethostbyname(host)) == NULL) {
-    DBG(("gethostbyname(%s) failed: %s", host, strerror(mg_get_errno())));
-  } else {
-    memcpy(ina, he->h_addr_list[0], sizeof(*ina));
-    return 1;
-  }
-  return 0;
-#endif /* MG_ENABLE_GETADDRINFO */
-}
-
-int mg_resolve(const char *host, char *buf, size_t n) {
-  struct in_addr ad;
-  return mg_resolve2(host, &ad) ? snprintf(buf, n, "%s", inet_ntoa(ad)) : 0;
-}
-#endif /* MG_ENABLE_SYNC_RESOLVER */
-
-MG_INTERNAL struct mg_connection *mg_create_connection_base(
-    struct mg_mgr *mgr, mg_event_handler_t callback,
-    struct mg_add_sock_opts opts) {
-  struct mg_connection *conn;
-
-  if ((conn = (struct mg_connection *) MG_CALLOC(1, sizeof(*conn))) != NULL) {
-    conn->sock = INVALID_SOCKET;
-    conn->handler = callback;
-    conn->mgr = mgr;
-    conn->last_io_time = (time_t) mg_time();
-    conn->iface =
-        (opts.iface != NULL ? opts.iface : mgr->ifaces[MG_MAIN_IFACE]);
-    conn->flags = opts.flags & _MG_ALLOWED_CONNECT_FLAGS_MASK;
-    conn->user_data = opts.user_data;
-    /*
-     * SIZE_MAX is defined as a long long constant in
-     * system headers on some platforms and so it
-     * doesn't compile with pedantic ansi flags.
-     */
-    conn->recv_mbuf_limit = ~0;
-  } else {
-    MG_SET_PTRPTR(opts.error_string, "failed to create connection");
-  }
-
-  return conn;
-}
-
-MG_INTERNAL struct mg_connection *mg_create_connection(
-    struct mg_mgr *mgr, mg_event_handler_t callback,
-    struct mg_add_sock_opts opts) {
-  struct mg_connection *conn = mg_create_connection_base(mgr, callback, opts);
-
-  if (conn != NULL && !conn->iface->vtable->create_conn(conn)) {
-    MG_FREE(conn);
-    conn = NULL;
-  }
-  if (conn == NULL) {
-    MG_SET_PTRPTR(opts.error_string, "failed to init connection");
-  }
-
-  return conn;
-}
-
-/*
- * Address format: [PROTO://][HOST]:PORT
- *
- * HOST could be IPv4/IPv6 address or a host name.
- * `host` is a destination buffer to hold parsed HOST part. Should be at least
- * MG_MAX_HOST_LEN bytes long.
- * `proto` is a returned socket type, either SOCK_STREAM or SOCK_DGRAM
- *
- * Return:
- *   -1   on parse error
- *    0   if HOST needs DNS lookup
- *   >0   length of the address string
- */
-MG_INTERNAL int mg_parse_address(const char *str, union socket_address *sa,
-                                 int *proto, char *host, size_t host_len) {
-  unsigned int a, b, c, d, port = 0;
-  int ch, len = 0;
-#if MG_ENABLE_IPV6
-  char buf[100];
-#endif
-
-  /*
-   * MacOS needs that. If we do not zero it, subsequent bind() will fail.
-   * Also, all-zeroes in the socket address means binding to all addresses
-   * for both IPv4 and IPv6 (INADDR_ANY and IN6ADDR_ANY_INIT).
-   */
-  memset(sa, 0, sizeof(*sa));
-  sa->sin.sin_family = AF_INET;
-
-  *proto = SOCK_STREAM;
-
-  if (strncmp(str, "udp://", 6) == 0) {
-    str += 6;
-    *proto = SOCK_DGRAM;
-  } else if (strncmp(str, "tcp://", 6) == 0) {
-    str += 6;
-  }
-
-  if (sscanf(str, "%u.%u.%u.%u:%u%n", &a, &b, &c, &d, &port, &len) == 5) {
-    /* Bind to a specific IPv4 address, e.g. 192.168.1.5:8080 */
-    sa->sin.sin_addr.s_addr =
-        htonl(((uint32_t) a << 24) | ((uint32_t) b << 16) | c << 8 | d);
-    sa->sin.sin_port = htons((uint16_t) port);
-#if MG_ENABLE_IPV6
-  } else if (sscanf(str, "[%99[^]]]:%u%n", buf, &port, &len) == 2 &&
-             inet_pton(AF_INET6, buf, &sa->sin6.sin6_addr)) {
-    /* IPv6 address, e.g. [3ffe:2a00:100:7031::1]:8080 */
-    sa->sin6.sin6_family = AF_INET6;
-    sa->sin.sin_port = htons((uint16_t) port);
-#endif
-#if MG_ENABLE_ASYNC_RESOLVER
-  } else if (strlen(str) < host_len &&
-             sscanf(str, "%[^ :]:%u%n", host, &port, &len) == 2) {
-    sa->sin.sin_port = htons((uint16_t) port);
-    if (mg_resolve_from_hosts_file(host, sa) != 0) {
-      /*
-       * if resolving from hosts file failed and the host
-       * we are trying to resolve is `localhost` - we should
-       * try to resolve it using `gethostbyname` and do not try
-       * to resolve it via DNS server if gethostbyname has failed too
-       */
-      if (mg_ncasecmp(host, "localhost", 9) != 0) {
-        return 0;
-      }
-
-#if MG_ENABLE_SYNC_RESOLVER
-      if (!mg_resolve2(host, &sa->sin.sin_addr)) {
-        return -1;
-      }
-#else
-      return -1;
-#endif
-    }
-#endif
-  } else if (sscanf(str, ":%u%n", &port, &len) == 1 ||
-             sscanf(str, "%u%n", &port, &len) == 1) {
-    /* If only port is specified, bind to IPv4, INADDR_ANY */
-    sa->sin.sin_port = htons((uint16_t) port);
-  } else {
-    return -1;
-  }
-
-  /* Required for MG_ENABLE_ASYNC_RESOLVER=0 */
-  (void) host;
-  (void) host_len;
-
-  ch = str[len]; /* Character that follows the address */
-  return port < 0xffffUL && (ch == '\0' || ch == ',' || isspace(ch)) ? len : -1;
-}
-
-#if MG_ENABLE_SSL
-MG_INTERNAL void mg_ssl_handshake(struct mg_connection *nc) {
-  int err = 0;
-  int server_side = (nc->listener != NULL);
-  enum mg_ssl_if_result res;
-  if (nc->flags & MG_F_SSL_HANDSHAKE_DONE) return;
-  res = mg_ssl_if_handshake(nc);
-
-  if (res == MG_SSL_OK) {
-    nc->flags |= MG_F_SSL_HANDSHAKE_DONE;
-    nc->flags &= ~(MG_F_WANT_READ | MG_F_WANT_WRITE);
-    if (server_side) {
-      mg_call(nc, NULL, nc->user_data, MG_EV_ACCEPT, &nc->sa);
-    } else {
-      mg_call(nc, NULL, nc->user_data, MG_EV_CONNECT, &err);
-    }
-  } else if (res == MG_SSL_WANT_READ) {
-    nc->flags |= MG_F_WANT_READ;
-  } else if (res == MG_SSL_WANT_WRITE) {
-    nc->flags |= MG_F_WANT_WRITE;
-  } else {
-    if (!server_side) {
-      err = res;
-      mg_call(nc, NULL, nc->user_data, MG_EV_CONNECT, &err);
-    }
-    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-  }
-}
-#endif /* MG_ENABLE_SSL */
-
-struct mg_connection *mg_if_accept_new_conn(struct mg_connection *lc) {
-  struct mg_add_sock_opts opts;
-  struct mg_connection *nc;
-  memset(&opts, 0, sizeof(opts));
-  nc = mg_create_connection(lc->mgr, lc->handler, opts);
-  if (nc == NULL) return NULL;
-  nc->listener = lc;
-  nc->proto_handler = lc->proto_handler;
-  nc->user_data = lc->user_data;
-  nc->recv_mbuf_limit = lc->recv_mbuf_limit;
-  nc->iface = lc->iface;
-  if (lc->flags & MG_F_SSL) nc->flags |= MG_F_SSL;
-  mg_add_conn(nc->mgr, nc);
-  LOG(LL_DEBUG, ("%p %p %d %#x", lc, nc, (int) nc->sock, (int) nc->flags));
-  return nc;
-}
-
-void mg_if_accept_tcp_cb(struct mg_connection *nc, union socket_address *sa,
-                         size_t sa_len) {
-  LOG(LL_DEBUG, ("%p %s://%s:%hu", nc, (nc->flags & MG_F_UDP ? "udp" : "tcp"),
-                 inet_ntoa(sa->sin.sin_addr), ntohs(sa->sin.sin_port)));
-  nc->sa = *sa;
-#if MG_ENABLE_SSL
-  if (nc->listener->flags & MG_F_SSL) {
-    nc->flags |= MG_F_SSL;
-    if (mg_ssl_if_conn_accept(nc, nc->listener) == MG_SSL_OK) {
-      mg_ssl_handshake(nc);
-    } else {
-      mg_close_conn(nc);
-    }
-  } else
-#endif
-  {
-    mg_call(nc, NULL, nc->user_data, MG_EV_ACCEPT, &nc->sa);
-  }
-  (void) sa_len;
-}
-
-void mg_send(struct mg_connection *nc, const void *buf, int len) {
-  nc->last_io_time = (time_t) mg_time();
-  mbuf_append(&nc->send_mbuf, buf, len);
-}
-
-static int mg_recv_tcp(struct mg_connection *nc, char *buf, size_t len);
-static int mg_recv_udp(struct mg_connection *nc, char *buf, size_t len);
-
-static int mg_do_recv(struct mg_connection *nc) {
-  int res = 0;
-  char *buf = NULL;
-  size_t len = (nc->flags & MG_F_UDP ? MG_UDP_IO_SIZE : MG_TCP_IO_SIZE);
-  if ((nc->flags & (MG_F_CLOSE_IMMEDIATELY | MG_F_CONNECTING)) ||
-      ((nc->flags & MG_F_LISTENING) && !(nc->flags & MG_F_UDP))) {
-    return -1;
-  }
-  do {
-    len = recv_avail_size(nc, len);
-    if (len == 0) {
-      res = -2;
-      break;
-    }
-    if (nc->recv_mbuf.size < nc->recv_mbuf.len + len) {
-      mbuf_resize(&nc->recv_mbuf, nc->recv_mbuf.len + len);
-    }
-    buf = nc->recv_mbuf.buf + nc->recv_mbuf.len;
-    len = nc->recv_mbuf.size - nc->recv_mbuf.len;
-    if (nc->flags & MG_F_UDP) {
-      res = mg_recv_udp(nc, buf, len);
-    } else {
-      res = mg_recv_tcp(nc, buf, len);
-    }
-  } while (res > 0 && !(nc->flags & (MG_F_CLOSE_IMMEDIATELY | MG_F_UDP)));
-  return res;
-}
-
-void mg_if_can_recv_cb(struct mg_connection *nc) {
-  mg_do_recv(nc);
-}
-
-static int mg_recv_tcp(struct mg_connection *nc, char *buf, size_t len) {
-  int n = 0;
-#if MG_ENABLE_SSL
-  if (nc->flags & MG_F_SSL) {
-    if (nc->flags & MG_F_SSL_HANDSHAKE_DONE) {
-      n = mg_ssl_if_read(nc, buf, len);
-      DBG(("%p <- %d bytes (SSL)", nc, n));
-      if (n < 0) {
-        if (n == MG_SSL_WANT_READ) {
-          nc->flags |= MG_F_WANT_READ;
-          n = 0;
-        } else {
-          nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-        }
-      } else if (n > 0) {
-        nc->flags &= ~MG_F_WANT_READ;
-      }
-    } else {
-      mg_ssl_handshake(nc);
-    }
-  } else
-#endif
-  {
-    n = nc->iface->vtable->tcp_recv(nc, buf, len);
-    DBG(("%p <- %d bytes", nc, n));
-  }
-  if (n > 0) {
-    nc->recv_mbuf.len += n;
-    nc->last_io_time = (time_t) mg_time();
-#if !defined(NO_LIBC) && MG_ENABLE_HEXDUMP
-    if (nc->mgr && nc->mgr->hexdump_file != NULL) {
-      mg_hexdump_connection(nc, nc->mgr->hexdump_file, buf, n, MG_EV_RECV);
-    }
-#endif
-    mbuf_trim(&nc->recv_mbuf);
-    mg_call(nc, NULL, nc->user_data, MG_EV_RECV, &n);
-  } else if (n < 0) {
-    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-  }
-  mbuf_trim(&nc->recv_mbuf);
-  return n;
-}
-
-static int mg_recv_udp(struct mg_connection *nc, char *buf, size_t len) {
-  int n = 0;
-  struct mg_connection *lc = nc;
-  union socket_address sa;
-  size_t sa_len = sizeof(sa);
-  n = nc->iface->vtable->udp_recv(lc, buf, len, &sa, &sa_len);
-  if (n < 0) {
-    lc->flags |= MG_F_CLOSE_IMMEDIATELY;
-    goto out;
-  }
-  if (nc->flags & MG_F_LISTENING) {
-    /*
-     * Do we have an existing connection for this source?
-     * This is very inefficient for long connection lists.
-     */
-    lc = nc;
-    for (nc = mg_next(lc->mgr, NULL); nc != NULL; nc = mg_next(lc->mgr, nc)) {
-      if (memcmp(&nc->sa.sa, &sa.sa, sa_len) == 0 && nc->listener == lc) {
-        break;
-      }
-    }
-    if (nc == NULL) {
-      struct mg_add_sock_opts opts;
-      memset(&opts, 0, sizeof(opts));
-      /* Create fake connection w/out sock initialization */
-      nc = mg_create_connection_base(lc->mgr, lc->handler, opts);
-      if (nc != NULL) {
-        nc->sock = lc->sock;
-        nc->listener = lc;
-        nc->sa = sa;
-        nc->proto_handler = lc->proto_handler;
-        nc->user_data = lc->user_data;
-        nc->recv_mbuf_limit = lc->recv_mbuf_limit;
-        nc->flags = MG_F_UDP;
-        /*
-         * Long-lived UDP "connections" i.e. interactions that involve more
-         * than one request and response are rare, most are transactional:
-         * response is sent and the "connection" is closed. Or - should be.
-         * But users (including ourselves) tend to forget about that part,
-         * because UDP is connectionless and one does not think about
-         * processing a UDP request as handling a connection that needs to be
-         * closed. Thus, we begin with SEND_AND_CLOSE flag set, which should
-         * be a reasonable default for most use cases, but it is possible to
-         * turn it off the connection should be kept alive after processing.
-         */
-        nc->flags |= MG_F_SEND_AND_CLOSE;
-        mg_add_conn(lc->mgr, nc);
-        mg_call(nc, NULL, nc->user_data, MG_EV_ACCEPT, &nc->sa);
-      }
-    }
-  }
-  if (nc != NULL) {
-    DBG(("%p <- %d bytes from %s:%d", nc, n, inet_ntoa(nc->sa.sin.sin_addr),
-         ntohs(nc->sa.sin.sin_port)));
-    if (nc == lc) {
-      nc->recv_mbuf.len += n;
-    } else {
-      mbuf_append(&nc->recv_mbuf, buf, n);
-    }
-    mbuf_trim(&lc->recv_mbuf);
-    lc->last_io_time = nc->last_io_time = (time_t) mg_time();
-#if !defined(NO_LIBC) && MG_ENABLE_HEXDUMP
-    if (nc->mgr && nc->mgr->hexdump_file != NULL) {
-      mg_hexdump_connection(nc, nc->mgr->hexdump_file, buf, n, MG_EV_RECV);
-    }
-#endif
-    if (n != 0) {
-      mg_call(nc, NULL, nc->user_data, MG_EV_RECV, &n);
-    }
-  }
-
-out:
-  mbuf_free(&lc->recv_mbuf);
-  return n;
-}
-
-void mg_if_can_send_cb(struct mg_connection *nc) {
-  int n = 0;
-  const char *buf = nc->send_mbuf.buf;
-  size_t len = nc->send_mbuf.len;
-
-  if (nc->flags & (MG_F_CLOSE_IMMEDIATELY | MG_F_CONNECTING)) {
-    return;
-  }
-  if (!(nc->flags & MG_F_UDP)) {
-    if (nc->flags & MG_F_LISTENING) return;
-    if (len > MG_TCP_IO_SIZE) len = MG_TCP_IO_SIZE;
-  }
-#if MG_ENABLE_SSL
-  if (nc->flags & MG_F_SSL) {
-    if (nc->flags & MG_F_SSL_HANDSHAKE_DONE) {
-      if (len > 0) {
-        n = mg_ssl_if_write(nc, buf, len);
-        DBG(("%p -> %d bytes (SSL)", nc, n));
-      }
-      if (n < 0) {
-        if (n == MG_SSL_WANT_WRITE) {
-          nc->flags |= MG_F_WANT_WRITE;
-          n = 0;
-        } else {
-          nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-        }
-      } else {
-        nc->flags &= ~MG_F_WANT_WRITE;
-      }
-    } else {
-      mg_ssl_handshake(nc);
-    }
-  } else
-#endif
-      if (len > 0) {
-    if (nc->flags & MG_F_UDP) {
-      n = nc->iface->vtable->udp_send(nc, buf, len);
-    } else {
-      n = nc->iface->vtable->tcp_send(nc, buf, len);
-    }
-    DBG(("%p -> %d bytes", nc, n));
-  }
-
-#if !defined(NO_LIBC) && MG_ENABLE_HEXDUMP
-  if (n > 0 && nc->mgr && nc->mgr->hexdump_file != NULL) {
-    mg_hexdump_connection(nc, nc->mgr->hexdump_file, buf, n, MG_EV_SEND);
-  }
-#endif
-  if (n < 0) {
-    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-  } else if (n > 0) {
-    nc->last_io_time = (time_t) mg_time();
-    mbuf_remove(&nc->send_mbuf, n);
-    mbuf_trim(&nc->send_mbuf);
-  }
-  if (n != 0) mg_call(nc, NULL, nc->user_data, MG_EV_SEND, &n);
-}
-
-/*
- * Schedules an async connect for a resolved address and proto.
- * Called from two places: `mg_connect_opt()` and from async resolver.
- * When called from the async resolver, it must trigger `MG_EV_CONNECT` event
- * with a failure flag to indicate connection failure.
- */
-MG_INTERNAL struct mg_connection *mg_do_connect(struct mg_connection *nc,
-                                                int proto,
-                                                union socket_address *sa) {
-  LOG(LL_DEBUG, ("%p %s://%s:%hu", nc, proto == SOCK_DGRAM ? "udp" : "tcp",
-                 inet_ntoa(sa->sin.sin_addr), ntohs(sa->sin.sin_port)));
-
-  nc->flags |= MG_F_CONNECTING;
-  if (proto == SOCK_DGRAM) {
-    nc->iface->vtable->connect_udp(nc);
-  } else {
-    nc->iface->vtable->connect_tcp(nc, sa);
-  }
-  mg_add_conn(nc->mgr, nc);
-  return nc;
-}
-
-void mg_if_connect_cb(struct mg_connection *nc, int err) {
-  LOG(LL_DEBUG,
-      ("%p %s://%s:%hu -> %d", nc, (nc->flags & MG_F_UDP ? "udp" : "tcp"),
-       inet_ntoa(nc->sa.sin.sin_addr), ntohs(nc->sa.sin.sin_port), err));
-  nc->flags &= ~MG_F_CONNECTING;
-  if (err != 0) {
-    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-  }
-#if MG_ENABLE_SSL
-  if (err == 0 && (nc->flags & MG_F_SSL)) {
-    mg_ssl_handshake(nc);
-  } else
-#endif
-  {
-    mg_call(nc, NULL, nc->user_data, MG_EV_CONNECT, &err);
-  }
-}
-
-#if MG_ENABLE_ASYNC_RESOLVER
-/*
- * Callback for the async resolver on mg_connect_opt() call.
- * Main task of this function is to trigger MG_EV_CONNECT event with
- *    either failure (and dealloc the connection)
- *    or success (and proceed with connect()
- */
-static void resolve_cb(struct mg_dns_message *msg, void *data,
-                       enum mg_resolve_err e) {
-  struct mg_connection *nc = (struct mg_connection *) data;
-  int i;
-  int failure = -1;
-
-  nc->flags &= ~MG_F_RESOLVING;
-  if (msg != NULL) {
-    /*
-     * Take the first DNS A answer and run...
-     */
-    for (i = 0; i < msg->num_answers; i++) {
-      if (msg->answers[i].rtype == MG_DNS_A_RECORD) {
-        /*
-         * Async resolver guarantees that there is at least one answer.
-         * TODO(lsm): handle IPv6 answers too
-         */
-        mg_dns_parse_record_data(msg, &msg->answers[i], &nc->sa.sin.sin_addr,
-                                 4);
-        mg_do_connect(nc, nc->flags & MG_F_UDP ? SOCK_DGRAM : SOCK_STREAM,
-                      &nc->sa);
-        return;
-      }
-    }
-  }
-
-  if (e == MG_RESOLVE_TIMEOUT) {
-    double now = mg_time();
-    mg_call(nc, NULL, nc->user_data, MG_EV_TIMER, &now);
-  }
-
-  /*
-   * If we get there was no MG_DNS_A_RECORD in the answer
-   */
-  mg_call(nc, NULL, nc->user_data, MG_EV_CONNECT, &failure);
-  mg_call(nc, NULL, nc->user_data, MG_EV_CLOSE, NULL);
-  mg_destroy_conn(nc, 1 /* destroy_if */);
-}
-#endif
-
-struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *address,
-                                 MG_CB(mg_event_handler_t callback,
-                                       void *user_data)) {
-  struct mg_connect_opts opts;
-  memset(&opts, 0, sizeof(opts));
-  return mg_connect_opt(mgr, address, MG_CB(callback, user_data), opts);
-}
-
-static void mg_ev_handler_empty(struct mg_connection *c, int ev,
-                         void *ev_data MG_UD_ARG(void *user_data)) {
-  (void) c;
-  (void) ev;
-  (void) ev_data;
-#if MG_ENABLE_CALLBACK_USERDATA
-  (void) user_data;
-#endif
-}
-
-struct mg_connection *mg_connect_opt(struct mg_mgr *mgr, const char *address,
-                                     MG_CB(mg_event_handler_t callback,
-                                           void *user_data),
-                                     struct mg_connect_opts opts) {
-  struct mg_connection *nc = NULL;
-  int proto, rc;
-  struct mg_add_sock_opts add_sock_opts;
-  char host[MG_MAX_HOST_LEN];
-
-  MG_COPY_COMMON_CONNECTION_OPTIONS(&add_sock_opts, &opts);
-
-  if (callback == NULL) callback = mg_ev_handler_empty;
-
-  if ((nc = mg_create_connection(mgr, callback, add_sock_opts)) == NULL) {
-    return NULL;
-  }
-
-  if ((rc = mg_parse_address(address, &nc->sa, &proto, host, sizeof(host))) <
-      0) {
-    /* Address is malformed */
-    MG_SET_PTRPTR(opts.error_string, "cannot parse address");
-    mg_destroy_conn(nc, 1 /* destroy_if */);
-    return NULL;
-  }
-
-  nc->flags |= opts.flags & _MG_ALLOWED_CONNECT_FLAGS_MASK;
-  nc->flags |= (proto == SOCK_DGRAM) ? MG_F_UDP : 0;
-#if MG_ENABLE_CALLBACK_USERDATA
-  nc->user_data = user_data;
-#else
-  nc->user_data = opts.user_data;
-#endif
-
-#if MG_ENABLE_SSL
-  LOG(LL_DEBUG,
-      ("%p %s %s,%s,%s", nc, address, (opts.ssl_cert ? opts.ssl_cert : "-"),
-       (opts.ssl_key ? opts.ssl_key : "-"),
-       (opts.ssl_ca_cert ? opts.ssl_ca_cert : "-")));
-
-  if (opts.ssl_cert != NULL || opts.ssl_ca_cert != NULL ||
-      opts.ssl_psk_identity != NULL) {
-    const char *err_msg = NULL;
-    struct mg_ssl_if_conn_params params;
-    if (nc->flags & MG_F_UDP) {
-      MG_SET_PTRPTR(opts.error_string, "SSL for UDP is not supported");
-      mg_destroy_conn(nc, 1 /* destroy_if */);
-      return NULL;
-    }
-    memset(&params, 0, sizeof(params));
-    params.cert = opts.ssl_cert;
-    params.key = opts.ssl_key;
-    params.ca_cert = opts.ssl_ca_cert;
-    params.cipher_suites = opts.ssl_cipher_suites;
-    params.psk_identity = opts.ssl_psk_identity;
-    params.psk_key = opts.ssl_psk_key;
-    if (opts.ssl_ca_cert != NULL) {
-      if (opts.ssl_server_name != NULL) {
-        if (strcmp(opts.ssl_server_name, "*") != 0) {
-          params.server_name = opts.ssl_server_name;
-        }
-      } else if (rc == 0) { /* If it's a DNS name, use host. */
-        params.server_name = host;
-      }
-    }
-    if (mg_ssl_if_conn_init(nc, &params, &err_msg) != MG_SSL_OK) {
-      MG_SET_PTRPTR(opts.error_string, err_msg);
-      mg_destroy_conn(nc, 1 /* destroy_if */);
-      return NULL;
-    }
-    nc->flags |= MG_F_SSL;
-  }
-#endif /* MG_ENABLE_SSL */
-
-  if (rc == 0) {
-#if MG_ENABLE_ASYNC_RESOLVER
-    /*
-     * DNS resolution is required for host.
-     * mg_parse_address() fills port in nc->sa, which we pass to resolve_cb()
-     */
-    struct mg_connection *dns_conn = NULL;
-    struct mg_resolve_async_opts o;
-    memset(&o, 0, sizeof(o));
-    o.dns_conn = &dns_conn;
-    o.nameserver = opts.nameserver;
-    if (mg_resolve_async_opt(nc->mgr, host, MG_DNS_A_RECORD, resolve_cb, nc,
-                             o) != 0) {
-      MG_SET_PTRPTR(opts.error_string, "cannot schedule DNS lookup");
-      mg_destroy_conn(nc, 1 /* destroy_if */);
-      return NULL;
-    }
-    nc->priv_2 = dns_conn;
-    nc->flags |= MG_F_RESOLVING;
-    return nc;
-#else
-    MG_SET_PTRPTR(opts.error_string, "Resolver is disabled");
-    mg_destroy_conn(nc, 1 /* destroy_if */);
-    return NULL;
-#endif
-  } else {
-    /* Address is parsed and resolved to IP. proceed with connect() */
-    return mg_do_connect(nc, proto, &nc->sa);
-  }
-}
-
-struct mg_connection *mg_bind(struct mg_mgr *srv, const char *address,
-                              MG_CB(mg_event_handler_t event_handler,
-                                    void *user_data)) {
-  struct mg_bind_opts opts;
-  memset(&opts, 0, sizeof(opts));
-  return mg_bind_opt(srv, address, MG_CB(event_handler, user_data), opts);
-}
-
-struct mg_connection *mg_bind_opt(struct mg_mgr *mgr, const char *address,
-                                  MG_CB(mg_event_handler_t callback,
-                                        void *user_data),
-                                  struct mg_bind_opts opts) {
-  union socket_address sa;
-  struct mg_connection *nc = NULL;
-  int proto, rc;
-  struct mg_add_sock_opts add_sock_opts;
-  char host[MG_MAX_HOST_LEN];
-
-#if MG_ENABLE_CALLBACK_USERDATA
-  opts.user_data = user_data;
-#endif
-
-  if (callback == NULL) callback = mg_ev_handler_empty;
-
-  MG_COPY_COMMON_CONNECTION_OPTIONS(&add_sock_opts, &opts);
-
-  if (mg_parse_address(address, &sa, &proto, host, sizeof(host)) <= 0) {
-    MG_SET_PTRPTR(opts.error_string, "cannot parse address");
-    return NULL;
-  }
-
-  nc = mg_create_connection(mgr, callback, add_sock_opts);
-  if (nc == NULL) {
-    return NULL;
-  }
-
-  nc->sa = sa;
-  nc->flags |= MG_F_LISTENING;
-  if (proto == SOCK_DGRAM) nc->flags |= MG_F_UDP;
-
-#if MG_ENABLE_SSL
-  DBG(("%p %s %s,%s,%s", nc, address, (opts.ssl_cert ? opts.ssl_cert : "-"),
-       (opts.ssl_key ? opts.ssl_key : "-"),
-       (opts.ssl_ca_cert ? opts.ssl_ca_cert : "-")));
-
-  if (opts.ssl_cert != NULL || opts.ssl_ca_cert != NULL) {
-    const char *err_msg = NULL;
-    struct mg_ssl_if_conn_params params;
-    if (nc->flags & MG_F_UDP) {
-      MG_SET_PTRPTR(opts.error_string, "SSL for UDP is not supported");
-      mg_destroy_conn(nc, 1 /* destroy_if */);
-      return NULL;
-    }
-    memset(&params, 0, sizeof(params));
-    params.cert = opts.ssl_cert;
-    params.key = opts.ssl_key;
-    params.ca_cert = opts.ssl_ca_cert;
-    params.cipher_suites = opts.ssl_cipher_suites;
-    if (mg_ssl_if_conn_init(nc, &params, &err_msg) != MG_SSL_OK) {
-      MG_SET_PTRPTR(opts.error_string, err_msg);
-      mg_destroy_conn(nc, 1 /* destroy_if */);
-      return NULL;
-    }
-    nc->flags |= MG_F_SSL;
-  }
-#endif /* MG_ENABLE_SSL */
-
-  if (nc->flags & MG_F_UDP) {
-    rc = nc->iface->vtable->listen_udp(nc, &nc->sa);
-  } else {
-    rc = nc->iface->vtable->listen_tcp(nc, &nc->sa);
-  }
-  if (rc != 0) {
-    DBG(("Failed to open listener: %d", rc));
-    MG_SET_PTRPTR(opts.error_string, "failed to open listener");
-    mg_destroy_conn(nc, 1 /* destroy_if */);
-    return NULL;
-  }
-  mg_add_conn(nc->mgr, nc);
-
-  return nc;
-}
-
-struct mg_connection *mg_next(struct mg_mgr *s, struct mg_connection *conn) {
-  return conn == NULL ? s->active_connections : conn->next;
-}
-
-#if MG_ENABLE_BROADCAST
-void mg_broadcast(struct mg_mgr *mgr, mg_event_handler_t cb, void *data,
-                  size_t len) {
-  struct ctl_msg ctl_msg;
-
-  /*
-   * Mongoose manager has a socketpair, `struct mg_mgr::ctl`,
-   * where `mg_broadcast()` pushes the message.
-   * `mg_mgr_poll()` wakes up, reads a message from the socket pair, and calls
-   * specified callback for each connection. Thus the callback function executes
-   * in event manager thread.
-   */
-  if (mgr->ctl[0] != INVALID_SOCKET && data != NULL &&
-      len < sizeof(ctl_msg.message)) {
-    size_t dummy;
-
-    ctl_msg.callback = cb;
-    memcpy(ctl_msg.message, data, len);
-    dummy = MG_SEND_FUNC(mgr->ctl[0], (char *) &ctl_msg,
-                         offsetof(struct ctl_msg, message) + len, 0);
-    dummy = MG_RECV_FUNC(mgr->ctl[0], (char *) &len, 1, 0);
-    (void) dummy; /* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509 */
-  }
-}
-#endif /* MG_ENABLE_BROADCAST */
-
-static int isbyte(int n) {
-  return n >= 0 && n <= 255;
-}
-
-static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
-  int n, a, b, c, d, slash = 32, len = 0;
-
-  if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
-       sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
-      isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) && slash >= 0 &&
-      slash < 33) {
-    len = n;
-    *net =
-        ((uint32_t) a << 24) | ((uint32_t) b << 16) | ((uint32_t) c << 8) | d;
-    *mask = slash ? 0xffffffffU << (32 - slash) : 0;
-  }
-
-  return len;
-}
-
-int mg_check_ip_acl(const char *acl, uint32_t remote_ip) {
-  int allowed, flag;
-  uint32_t net, mask;
-  struct mg_str vec;
-
-  /* If any ACL is set, deny by default */
-  allowed = (acl == NULL || *acl == '\0') ? '+' : '-';
-
-  while ((acl = mg_next_comma_list_entry(acl, &vec, NULL)) != NULL) {
-    flag = vec.p[0];
-    if ((flag != '+' && flag != '-') ||
-        parse_net(&vec.p[1], &net, &mask) == 0) {
-      return -1;
-    }
-
-    if (net == (remote_ip & mask)) {
-      allowed = flag;
-    }
-  }
-
-  DBG(("%08x %c", (unsigned int) remote_ip, allowed));
-  return allowed == '+';
-}
-
-/* Move data from one connection to another */
-void mg_forward(struct mg_connection *from, struct mg_connection *to) {
-  mg_send(to, from->recv_mbuf.buf, from->recv_mbuf.len);
-  mbuf_remove(&from->recv_mbuf, from->recv_mbuf.len);
-}
-
-double mg_set_timer(struct mg_connection *c, double timestamp) {
-  double result = c->ev_timer_time;
-  c->ev_timer_time = timestamp;
-  /*
-   * If this connection is resolving, it's not in the list of active
-   * connections, so not processed yet. It has a DNS resolver connection
-   * linked to it. Set up a timer for the DNS connection.
-   */
-  DBG(("%p %p %d -> %lu", c, c->priv_2, (c->flags & MG_F_RESOLVING ? 1 : 0),
-       (unsigned long) timestamp));
-  if ((c->flags & MG_F_RESOLVING) && c->priv_2 != NULL) {
-    mg_set_timer((struct mg_connection *) c->priv_2, timestamp);
-  }
-  return result;
-}
-
-static void mg_sock_set(struct mg_connection *nc, sock_t sock) {
-  if (sock != INVALID_SOCKET) {
-    nc->iface->vtable->sock_set(nc, sock);
-  }
-}
-
-static void mg_if_get_conn_addr(struct mg_connection *nc, int remote,
-                         union socket_address *sa) {
-  nc->iface->vtable->get_conn_addr(nc, remote, sa);
-}
-
-struct mg_connection *mg_add_sock_opt(struct mg_mgr *s, sock_t sock,
-                                      MG_CB(mg_event_handler_t callback,
-                                            void *user_data),
-                                      struct mg_add_sock_opts opts) {
-#if MG_ENABLE_CALLBACK_USERDATA
-  opts.user_data = user_data;
-#endif
-
-  struct mg_connection *nc = mg_create_connection_base(s, callback, opts);
-  if (nc != NULL) {
-    mg_sock_set(nc, sock);
-    mg_add_conn(nc->mgr, nc);
-  }
-  return nc;
-}
-
-struct mg_connection *mg_add_sock(struct mg_mgr *s, sock_t sock,
-                                  MG_CB(mg_event_handler_t callback,
-                                        void *user_data)) {
-  struct mg_add_sock_opts opts;
-  memset(&opts, 0, sizeof(opts));
-  return mg_add_sock_opt(s, sock, MG_CB(callback, user_data), opts);
-}
-
-double mg_time(void) {
-  return cs_time();
-}
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_net_if_socket.h"
-#endif
-
-#ifndef CS_MONGOOSE_SRC_NET_IF_SOCKET_H_
-#define CS_MONGOOSE_SRC_NET_IF_SOCKET_H_
-
-/* Amalgamated: #include "mg_net_if.h" */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-#ifndef MG_ENABLE_NET_IF_SOCKET
-#define MG_ENABLE_NET_IF_SOCKET MG_NET_IF == MG_NET_IF_SOCKET
-#endif
-
-extern const struct mg_iface_vtable mg_socket_iface_vtable;
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* CS_MONGOOSE_SRC_NET_IF_SOCKET_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_net_if_socks.h"
-#endif
-
-#ifndef CS_MONGOOSE_SRC_NET_IF_SOCKS_H_
-#define CS_MONGOOSE_SRC_NET_IF_SOCKS_H_
-
-#if MG_ENABLE_SOCKS
-/* Amalgamated: #include "mg_net_if.h" */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-extern const struct mg_iface_vtable mg_socks_iface_vtable;
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* MG_ENABLE_SOCKS */
-#endif /* CS_MONGOOSE_SRC_NET_IF_SOCKS_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_net_if.c"
-#endif
-/* Amalgamated: #include "mg_net_if.h" */
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_net_if_socket.h" */
-
-extern const struct mg_iface_vtable mg_default_iface_vtable;
-
-const struct mg_iface_vtable *mg_ifaces[] = {
-    &mg_default_iface_vtable,
-};
-
-int mg_num_ifaces = (int) (sizeof(mg_ifaces) / sizeof(mg_ifaces[0]));
-
-struct mg_iface *mg_if_create_iface(const struct mg_iface_vtable *vtable,
-                                    struct mg_mgr *mgr) {
-  struct mg_iface *iface = (struct mg_iface *) MG_CALLOC(1, sizeof(*iface));
-  iface->mgr = mgr;
-  iface->data = NULL;
-  iface->vtable = vtable;
-  return iface;
-}
-
-struct mg_iface *mg_find_iface(struct mg_mgr *mgr,
-                               const struct mg_iface_vtable *vtable,
-                               struct mg_iface *from) {
-  int i = 0;
-  if (from != NULL) {
-    for (i = 0; i < mgr->num_ifaces; i++) {
-      if (mgr->ifaces[i] == from) {
-        i++;
-        break;
-      }
-    }
-  }
-
-  for (; i < mgr->num_ifaces; i++) {
-    if (mgr->ifaces[i]->vtable == vtable) {
-      return mgr->ifaces[i];
-    }
-  }
-  return NULL;
-}
-
-double mg_mgr_min_timer(const struct mg_mgr *mgr) {
-  double min_timer = 0;
-  struct mg_connection *nc;
-  for (nc = mgr->active_connections; nc != NULL; nc = nc->next) {
-    if (nc->ev_timer_time <= 0) continue;
-    if (min_timer == 0 || nc->ev_timer_time < min_timer) {
-      min_timer = nc->ev_timer_time;
-    }
-  }
-  return min_timer;
-}
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_net_if_null.c"
-#endif
-
-static void mg_null_if_connect_tcp(struct mg_connection *c,
-                                   const union socket_address *sa) {
-  c->flags |= MG_F_CLOSE_IMMEDIATELY;
-  (void) sa;
-}
-
-static void mg_null_if_connect_udp(struct mg_connection *c) {
-  c->flags |= MG_F_CLOSE_IMMEDIATELY;
-}
-
-static int mg_null_if_listen_tcp(struct mg_connection *c,
-                                 union socket_address *sa) {
-  (void) c;
-  (void) sa;
-  return -1;
-}
-
-static int mg_null_if_listen_udp(struct mg_connection *c,
-                                 union socket_address *sa) {
-  (void) c;
-  (void) sa;
-  return -1;
-}
-
-static int mg_null_if_tcp_send(struct mg_connection *c, const void *buf,
-                               size_t len) {
-  (void) c;
-  (void) buf;
-  (void) len;
-  return -1;
-}
-
-static int mg_null_if_udp_send(struct mg_connection *c, const void *buf,
-                               size_t len) {
-  (void) c;
-  (void) buf;
-  (void) len;
-  return -1;
-}
-
-static int mg_null_if_tcp_recv(struct mg_connection *c, void *buf, size_t len) {
-  (void) c;
-  (void) buf;
-  (void) len;
-  return -1;
-}
-
-static int mg_null_if_udp_recv(struct mg_connection *c, void *buf, size_t len,
-                        union socket_address *sa, size_t *sa_len) {
-  (void) c;
-  (void) buf;
-  (void) len;
-  (void) sa;
-  (void) sa_len;
-  return -1;
-}
-
-static int mg_null_if_create_conn(struct mg_connection *c) {
-  (void) c;
-  return 1;
-}
-
-static void mg_null_if_destroy_conn(struct mg_connection *c) {
-  (void) c;
-}
-
-static void mg_null_if_sock_set(struct mg_connection *c, sock_t sock) {
-  (void) c;
-  (void) sock;
-}
-
-static void mg_null_if_init(struct mg_iface *iface) {
-  (void) iface;
-}
-
-static void mg_null_if_free(struct mg_iface *iface) {
-  (void) iface;
-}
-
-static void mg_null_if_add_conn(struct mg_connection *c) {
-  c->sock = INVALID_SOCKET;
-  c->flags |= MG_F_CLOSE_IMMEDIATELY;
-}
-
-static void mg_null_if_remove_conn(struct mg_connection *c) {
-  (void) c;
-}
-
-static time_t mg_null_if_poll(struct mg_iface *iface, int timeout_ms) {
-  struct mg_mgr *mgr = iface->mgr;
-  struct mg_connection *nc, *tmp;
-  double now = mg_time();
-  /* We basically just run timers and poll. */
-  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
-    tmp = nc->next;
-    mg_if_poll(nc, now);
-  }
-  (void) timeout_ms;
-  return (time_t) now;
-}
-
-static void mg_null_if_get_conn_addr(struct mg_connection *c, int remote,
-                                     union socket_address *sa) {
-  (void) c;
-  (void) remote;
-  (void) sa;
-}
-
-#define MG_NULL_IFACE_VTABLE                                                   \
-  {                                                                            \
-    mg_null_if_init, mg_null_if_free, mg_null_if_add_conn,                     \
-        mg_null_if_remove_conn, mg_null_if_poll, mg_null_if_listen_tcp,        \
-        mg_null_if_listen_udp, mg_null_if_connect_tcp, mg_null_if_connect_udp, \
-        mg_null_if_tcp_send, mg_null_if_udp_send, mg_null_if_tcp_recv,         \
-        mg_null_if_udp_recv, mg_null_if_create_conn, mg_null_if_destroy_conn,  \
-        mg_null_if_sock_set, mg_null_if_get_conn_addr,                         \
-  }
-
-const struct mg_iface_vtable mg_null_iface_vtable = MG_NULL_IFACE_VTABLE;
-
-#if MG_NET_IF == MG_NET_IF_NULL
-const struct mg_iface_vtable mg_default_iface_vtable = MG_NULL_IFACE_VTABLE;
-#endif /* MG_NET_IF == MG_NET_IF_NULL */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_net_if_socket.c"
-#endif
-
-#if MG_ENABLE_NET_IF_SOCKET
-
-/* Amalgamated: #include "mg_net_if_socket.h" */
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_util.h" */
-
-static sock_t mg_open_listening_socket(union socket_address *sa, int type,
-                                       int proto);
-
-static void mg_set_non_blocking_mode(sock_t sock) {
-#ifdef _WIN32
-  unsigned long on = 1;
-  ioctlsocket(sock, FIONBIO, &on);
-#else
-  int flags = fcntl(sock, F_GETFL, 0);
-  fcntl(sock, F_SETFL, flags | O_NONBLOCK);
-#endif
-}
-
-static int mg_is_error(void) {
-  int err = mg_get_errno();
-  return err != EINPROGRESS && err != EWOULDBLOCK
-#ifndef WINCE
-         && err != EAGAIN && err != EINTR
-#endif
-#ifdef _WIN32
-         && WSAGetLastError() != WSAEINTR && WSAGetLastError() != WSAEWOULDBLOCK
-#endif
-      ;
-}
-
-static void mg_socket_if_connect_tcp(struct mg_connection *nc,
-                              const union socket_address *sa) {
-  int rc, proto = 0;
-  nc->sock = socket(AF_INET, SOCK_STREAM, proto);
-  if (nc->sock == INVALID_SOCKET) {
-    nc->err = mg_get_errno() ? mg_get_errno() : 1;
-    return;
-  }
-#if !defined(MG_ESP8266)
-  mg_set_non_blocking_mode(nc->sock);
-#endif
-  rc = connect(nc->sock, &sa->sa, sizeof(sa->sin));
-  nc->err = rc < 0 && mg_is_error() ? mg_get_errno() : 0;
-  DBG(("%p sock %d rc %d errno %d err %d", nc, (int) nc->sock, rc,
-      mg_get_errno(), nc->err));
-}
-
-static void mg_socket_if_connect_udp(struct mg_connection *nc) {
-  nc->sock = socket(AF_INET, SOCK_DGRAM, 0);
-  if (nc->sock == INVALID_SOCKET) {
-    nc->err = mg_get_errno() ? mg_get_errno() : 1;
-    return;
-  }
-  if (nc->flags & MG_F_ENABLE_BROADCAST) {
-    int optval = 1;
-    if (setsockopt(nc->sock, SOL_SOCKET, SO_BROADCAST, (const char *) &optval,
-                   sizeof(optval)) < 0) {
-      nc->err = mg_get_errno() ? mg_get_errno() : 1;
-      return;
-    }
-  }
-  nc->err = 0;
-}
-
-static int mg_socket_if_listen_tcp(struct mg_connection *nc,
-                            union socket_address *sa) {
-  int proto = 0;
-  sock_t sock = mg_open_listening_socket(sa, SOCK_STREAM, proto);
-  if (sock == INVALID_SOCKET) {
-    return (mg_get_errno() ? mg_get_errno() : 1);
-  }
-  mg_sock_set(nc, sock);
-  return 0;
-}
-
-static int mg_socket_if_listen_udp(struct mg_connection *nc,
-                                   union socket_address *sa) {
-  sock_t sock = mg_open_listening_socket(sa, SOCK_DGRAM, 0);
-  if (sock == INVALID_SOCKET) return (mg_get_errno() ? mg_get_errno() : 1);
-  mg_sock_set(nc, sock);
-  return 0;
-}
-
-static int mg_socket_if_tcp_send(struct mg_connection *nc, const void *buf,
-                                 size_t len) {
-  int n = (int) MG_SEND_FUNC(nc->sock, buf, len, 0);
-  if (n < 0 && !mg_is_error()) n = 0;
-  return n;
-}
-
-static int mg_socket_if_udp_send(struct mg_connection *nc, const void *buf,
-                                 size_t len) {
-  int n = sendto(nc->sock, buf, len, 0, &nc->sa.sa, sizeof(nc->sa.sin));
-  if (n < 0 && !mg_is_error()) n = 0;
-  return n;
-}
-
-static int mg_socket_if_tcp_recv(struct mg_connection *nc, void *buf,
-                                 size_t len) {
-  int n = (int) MG_RECV_FUNC(nc->sock, buf, len, 0);
-  if (n == 0) {
-    /* Orderly shutdown of the socket, try flushing output. */
-    nc->flags |= MG_F_SEND_AND_CLOSE;
-  } else if (n < 0 && !mg_is_error()) {
-    n = 0;
-  }
-  return n;
-}
-
-static int mg_socket_if_udp_recv(struct mg_connection *nc, void *buf,
-                                 size_t len, union socket_address *sa,
-                                 size_t *sa_len) {
-  socklen_t sa_len_st = *sa_len;
-  int n = recvfrom(nc->sock, buf, len, 0, &sa->sa, &sa_len_st);
-  *sa_len = sa_len_st;
-  if (n < 0 && !mg_is_error()) n = 0;
-  return n;
-}
-
-static int mg_socket_if_create_conn(struct mg_connection *nc) {
-  (void) nc;
-  return 1;
-}
-
-static void mg_socket_if_destroy_conn(struct mg_connection *nc) {
-  if (nc->sock == INVALID_SOCKET) return;
-  if (!(nc->flags & MG_F_UDP)) {
-    closesocket(nc->sock);
-  } else {
-    /* Only close outgoing UDP sockets or listeners. */
-    if (nc->listener == NULL) closesocket(nc->sock);
-  }
-  nc->sock = INVALID_SOCKET;
-}
-
-static int mg_accept_conn(struct mg_connection *lc) {
-  struct mg_connection *nc;
-  union socket_address sa;
-  socklen_t sa_len = sizeof(sa);
-  /* NOTE(lsm): on Windows, sock is always > FD_SETSIZE */
-  sock_t sock = accept(lc->sock, &sa.sa, &sa_len);
-  if (sock == INVALID_SOCKET) {
-    if (mg_is_error()) {
-      DBG(("%p: failed to accept: %d", lc, mg_get_errno()));
-    }
-    return 0;
-  }
-  nc = mg_if_accept_new_conn(lc);
-  if (nc == NULL) {
-    closesocket(sock);
-    return 0;
-  }
-  DBG(("%p conn from %s:%d", nc, inet_ntoa(sa.sin.sin_addr),
-       ntohs(sa.sin.sin_port)));
-  mg_sock_set(nc, sock);
-  mg_if_accept_tcp_cb(nc, &sa, sa_len);
-  return 1;
-}
-
-/* 'sa' must be an initialized address to bind to */
-static sock_t mg_open_listening_socket(union socket_address *sa, int type,
-                                       int proto) {
-  socklen_t sa_len =
-      (sa->sa.sa_family == AF_INET) ? sizeof(sa->sin) : sizeof(sa->sin6);
-  sock_t sock = INVALID_SOCKET;
-#if !MG_LWIP
-  int on = 1;
-#endif
-
-  if ((sock = socket(sa->sa.sa_family, type, proto)) != INVALID_SOCKET &&
-#if !MG_LWIP /* LWIP doesn't support either */
-#if defined(_WIN32) && defined(SO_EXCLUSIVEADDRUSE) && !defined(WINCE)
-      /* "Using SO_REUSEADDR and SO_EXCLUSIVEADDRUSE" http://goo.gl/RmrFTm */
-      !setsockopt(sock, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (void *) &on,
-                  sizeof(on)) &&
-#endif
-
-#if !defined(_WIN32) || !defined(SO_EXCLUSIVEADDRUSE)
-      /*
-       * SO_RESUSEADDR is not enabled on Windows because the semantics of
-       * SO_REUSEADDR on UNIX and Windows is different. On Windows,
-       * SO_REUSEADDR allows to bind a socket to a port without error even if
-       * the port is already open by another program. This is not the behavior
-       * SO_REUSEADDR was designed for, and leads to hard-to-track failure
-       * scenarios. Therefore, SO_REUSEADDR was disabled on Windows unless
-       * SO_EXCLUSIVEADDRUSE is supported and set on a socket.
-       */
-      !setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &on, sizeof(on)) &&
-#endif
-#endif /* !MG_LWIP */
-
-      !bind(sock, &sa->sa, sa_len) &&
-      (type == SOCK_DGRAM || listen(sock, SOMAXCONN) == 0)) {
-#if !MG_LWIP
-    mg_set_non_blocking_mode(sock);
-    /* In case port was set to 0, get the real port number */
-    (void) getsockname(sock, &sa->sa, &sa_len);
-#endif
-  } else if (sock != INVALID_SOCKET) {
-    closesocket(sock);
-    sock = INVALID_SOCKET;
-  }
-
-  return sock;
-}
-
-#define _MG_F_FD_CAN_READ 1
-#define _MG_F_FD_CAN_WRITE 1 << 1
-#define _MG_F_FD_ERROR 1 << 2
-
-static void mg_mgr_handle_conn(struct mg_connection *nc, int fd_flags, double now) {
-  int worth_logging =
-      fd_flags != 0 || (nc->flags & (MG_F_WANT_READ | MG_F_WANT_WRITE));
-  if (worth_logging) {
-    DBG(("%p fd=%d fd_flags=%d nc_flags=0x%lx rmbl=%d smbl=%d", nc,
-         (int) nc->sock, fd_flags, nc->flags, (int) nc->recv_mbuf.len,
-         (int) nc->send_mbuf.len));
-  }
-
-  if (!mg_if_poll(nc, now)) return;
-
-  if (nc->flags & MG_F_CONNECTING) {
-    if (fd_flags != 0) {
-      int err = 0;
-#if !defined(MG_ESP8266)
-      if (!(nc->flags & MG_F_UDP)) {
-        socklen_t len = sizeof(err);
-        int ret =
-            getsockopt(nc->sock, SOL_SOCKET, SO_ERROR, (char *) &err, &len);
-        if (ret != 0) {
-          err = 1;
-        } else if (err == EAGAIN || err == EWOULDBLOCK) {
-          err = 0;
-        }
-      }
-#else
-      /*
-       * On ESP8266 we use blocking connect.
-       */
-      err = nc->err;
-#endif
-      mg_if_connect_cb(nc, err);
-    } else if (nc->err != 0) {
-      mg_if_connect_cb(nc, nc->err);
-    }
-  }
-
-  if (fd_flags & _MG_F_FD_CAN_READ) {
-    if (nc->flags & MG_F_UDP) {
-      mg_if_can_recv_cb(nc);
-    } else {
-      if (nc->flags & MG_F_LISTENING) {
-        /*
-         * We're not looping here, and accepting just one connection at
-         * a time. The reason is that eCos does not respect non-blocking
-         * flag on a listening socket and hangs in a loop.
-         */
-        mg_accept_conn(nc);
-      } else {
-        mg_if_can_recv_cb(nc);
-      }
-    }
-  }
-
-  if (fd_flags & _MG_F_FD_CAN_WRITE) mg_if_can_send_cb(nc);
-
-  if (worth_logging) {
-    DBG(("%p after fd=%d nc_flags=0x%lx rmbl=%d smbl=%d", nc, (int) nc->sock,
-         nc->flags, (int) nc->recv_mbuf.len, (int) nc->send_mbuf.len));
-  }
-}
-
-#if MG_ENABLE_BROADCAST
-static void mg_mgr_handle_ctl_sock(struct mg_mgr *mgr) {
-  struct ctl_msg ctl_msg;
-  int len = (int) MG_RECV_FUNC(mgr->ctl[1], (char *) &ctl_msg, sizeof(ctl_msg), 0);
-  size_t dummy = MG_SEND_FUNC(mgr->ctl[1], ctl_msg.message, 1, 0);
-  DBG(("read %d from ctl socket", len));
-  (void) dummy; /* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509 */
-  if (len >= (int) sizeof(ctl_msg.callback) && ctl_msg.callback != NULL) {
-    struct mg_connection *nc;
-    for (nc = mg_next(mgr, NULL); nc != NULL; nc = mg_next(mgr, nc)) {
-      ctl_msg.callback(nc, MG_EV_POLL,
-                       ctl_msg.message MG_UD_ARG(nc->user_data));
-    }
-  }
-}
-#endif
-
-/* Associate a socket to a connection. */
-static void mg_socket_if_sock_set(struct mg_connection *nc, sock_t sock) {
-  mg_set_non_blocking_mode(sock);
-  mg_set_close_on_exec(sock);
-  nc->sock = sock;
-  DBG(("%p %d", nc, (int) sock));
-}
-
-static void mg_socket_if_init(struct mg_iface *iface) {
-  (void) iface;
-  DBG(("%p using select()", iface->mgr));
-#if MG_ENABLE_BROADCAST
-  mg_socketpair(iface->mgr->ctl, SOCK_DGRAM);
-#endif
-}
-
-static void mg_socket_if_free(struct mg_iface *iface) {
-  (void) iface;
-}
-
-static void mg_socket_if_add_conn(struct mg_connection *nc) {
-  (void) nc;
-}
-
-static void mg_socket_if_remove_conn(struct mg_connection *nc) {
-  (void) nc;
-}
-
-static void mg_add_to_set(sock_t sock, fd_set *set, sock_t *max_fd) {
-  if (sock != INVALID_SOCKET
-#ifdef __unix__
-      && sock < (sock_t) FD_SETSIZE
-#endif
-      ) {
-    FD_SET(sock, set);
-    if (*max_fd == INVALID_SOCKET || sock > *max_fd) {
-      *max_fd = sock;
-    }
-  }
-}
-
-static time_t mg_socket_if_poll(struct mg_iface *iface, int timeout_ms) {
-  struct mg_mgr *mgr = iface->mgr;
-  double now = mg_time();
-  double min_timer;
-  struct mg_connection *nc, *tmp;
-  struct timeval tv;
-  fd_set read_set, write_set, err_set;
-  sock_t max_fd = INVALID_SOCKET;
-  int num_fds, num_ev, num_timers = 0;
-#ifdef __unix__
-  int try_dup = 1;
-#endif
-
-  FD_ZERO(&read_set);
-  FD_ZERO(&write_set);
-  FD_ZERO(&err_set);
-#if MG_ENABLE_BROADCAST
-  mg_add_to_set(mgr->ctl[1], &read_set, &max_fd);
-#endif
-
-  /*
-   * Note: it is ok to have connections with sock == INVALID_SOCKET in the list,
-   * e.g. timer-only "connections".
-   */
-  min_timer = 0;
-  for (nc = mgr->active_connections, num_fds = 0; nc != NULL; nc = tmp) {
-    tmp = nc->next;
-
-    if (nc->sock != INVALID_SOCKET) {
-      num_fds++;
-
-#ifdef __unix__
-      /* A hack to make sure all our file descriptos fit into FD_SETSIZE. */
-      if (nc->sock >= (sock_t) FD_SETSIZE && try_dup) {
-        int new_sock = dup(nc->sock);
-        if (new_sock >= 0) {
-          if (new_sock < (sock_t) FD_SETSIZE) {
-            closesocket(nc->sock);
-            DBG(("new sock %d -> %d", nc->sock, new_sock));
-            nc->sock = new_sock;
-          } else {
-            closesocket(new_sock);
-            DBG(("new sock is still larger than FD_SETSIZE, disregard"));
-            try_dup = 0;
-          }
-        } else {
-          try_dup = 0;
-        }
-      }
-#endif
-
-      if (nc->recv_mbuf.len < nc->recv_mbuf_limit &&
-          (!(nc->flags & MG_F_UDP) || nc->listener == NULL)) {
-        mg_add_to_set(nc->sock, &read_set, &max_fd);
-      }
-
-      if (((nc->flags & MG_F_CONNECTING) && !(nc->flags & MG_F_WANT_READ)) ||
-          (nc->send_mbuf.len > 0 && !(nc->flags & MG_F_CONNECTING))) {
-        mg_add_to_set(nc->sock, &write_set, &max_fd);
-        mg_add_to_set(nc->sock, &err_set, &max_fd);
-      }
-    }
-
-    if (nc->ev_timer_time > 0) {
-      if (num_timers == 0 || nc->ev_timer_time < min_timer) {
-        min_timer = nc->ev_timer_time;
-      }
-      num_timers++;
-    }
-  }
-
-  /*
-   * If there is a timer to be fired earlier than the requested timeout,
-   * adjust the timeout.
-   */
-  if (num_timers > 0) {
-    double timer_timeout_ms = (min_timer - mg_time()) * 1000 + 1 /* rounding */;
-    if (timer_timeout_ms < timeout_ms) {
-      timeout_ms = (int) timer_timeout_ms;
-    }
-  }
-  if (timeout_ms < 0) timeout_ms = 0;
-
-  tv.tv_sec = timeout_ms / 1000;
-  tv.tv_usec = (timeout_ms % 1000) * 1000;
-
-  num_ev = select((int) max_fd + 1, &read_set, &write_set, &err_set, &tv);
-  now = mg_time();
-#if 0
-  DBG(("select @ %ld num_ev=%d of %d, timeout=%d", (long) now, num_ev, num_fds,
-       timeout_ms));
-#endif
-
-#if MG_ENABLE_BROADCAST
-  if (num_ev > 0 && mgr->ctl[1] != INVALID_SOCKET &&
-      FD_ISSET(mgr->ctl[1], &read_set)) {
-    mg_mgr_handle_ctl_sock(mgr);
-  }
-#endif
-
-  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
-    int fd_flags = 0;
-    if (nc->sock != INVALID_SOCKET) {
-      if (num_ev > 0) {
-        fd_flags = (FD_ISSET(nc->sock, &read_set) &&
-                            (!(nc->flags & MG_F_UDP) || nc->listener == NULL)
-                        ? _MG_F_FD_CAN_READ
-                        : 0) |
-                   (FD_ISSET(nc->sock, &write_set) ? _MG_F_FD_CAN_WRITE : 0) |
-                   (FD_ISSET(nc->sock, &err_set) ? _MG_F_FD_ERROR : 0);
-      }
-#if MG_LWIP
-      /* With LWIP socket emulation layer, we don't get write events for UDP */
-      if ((nc->flags & MG_F_UDP) && nc->listener == NULL) {
-        fd_flags |= _MG_F_FD_CAN_WRITE;
-      }
-#endif
-    }
-    tmp = nc->next;
-    mg_mgr_handle_conn(nc, fd_flags, now);
-  }
-
-  return (time_t) now;
-}
-
-#if MG_ENABLE_BROADCAST
-MG_INTERNAL void mg_socketpair_close(sock_t *sock) {
-  while (1) {
-    if (closesocket(*sock) == -1 && errno == EINTR) continue;
-    break;
-  }
-  *sock = INVALID_SOCKET;
-}
-
-MG_INTERNAL sock_t
-mg_socketpair_accept(sock_t sock, union socket_address *sa, socklen_t sa_len) {
-  sock_t rc;
-  while (1) {
-    if ((rc = accept(sock, &sa->sa, &sa_len)) == INVALID_SOCKET &&
-        errno == EINTR)
-      continue;
-    break;
-  }
-  return rc;
-}
-
-int mg_socketpair(sock_t sp[2], int sock_type) {
-  union socket_address sa, sa2;
-  sock_t sock;
-  socklen_t len = sizeof(sa.sin);
-  int ret = 0;
-
-  sock = sp[0] = sp[1] = INVALID_SOCKET;
-
-  (void) memset(&sa, 0, sizeof(sa));
-  sa.sin.sin_family = AF_INET;
-  sa.sin.sin_addr.s_addr = htonl(0x7f000001); /* 127.0.0.1 */
-  sa2 = sa;
-
-  if ((sock = socket(AF_INET, sock_type, 0)) == INVALID_SOCKET) {
-  } else if (bind(sock, &sa.sa, len) != 0) {
-  } else if (sock_type == SOCK_STREAM && listen(sock, 1) != 0) {
-  } else if (getsockname(sock, &sa.sa, &len) != 0) {
-  } else if ((sp[0] = socket(AF_INET, sock_type, 0)) == INVALID_SOCKET) {
-  } else if (sock_type == SOCK_STREAM && connect(sp[0], &sa.sa, len) != 0) {
-  } else if (sock_type == SOCK_DGRAM &&
-             (bind(sp[0], &sa2.sa, len) != 0 ||
-              getsockname(sp[0], &sa2.sa, &len) != 0 ||
-              connect(sp[0], &sa.sa, len) != 0 ||
-              connect(sock, &sa2.sa, len) != 0)) {
-  } else if ((sp[1] = (sock_type == SOCK_DGRAM ? sock : mg_socketpair_accept(
-                                                            sock, &sa, len))) ==
-             INVALID_SOCKET) {
-  } else {
-    mg_set_close_on_exec(sp[0]);
-    mg_set_close_on_exec(sp[1]);
-    if (sock_type == SOCK_STREAM) mg_socketpair_close(&sock);
-    ret = 1;
-  }
-
-  if (!ret) {
-    if (sp[0] != INVALID_SOCKET) mg_socketpair_close(&sp[0]);
-    if (sp[1] != INVALID_SOCKET) mg_socketpair_close(&sp[1]);
-    if (sock != INVALID_SOCKET) mg_socketpair_close(&sock);
-  }
-
-  return ret;
-}
-#endif /* MG_ENABLE_BROADCAST */
-
-static void mg_sock_get_addr(sock_t sock, int remote,
-                             union socket_address *sa) {
-  socklen_t slen = sizeof(*sa);
-  memset(sa, 0, slen);
-  if (remote) {
-    getpeername(sock, &sa->sa, &slen);
-  } else {
-    getsockname(sock, &sa->sa, &slen);
-  }
-}
-
-void mg_sock_to_str(sock_t sock, char *buf, size_t len, int flags) {
-  union socket_address sa;
-  mg_sock_get_addr(sock, flags & MG_SOCK_STRINGIFY_REMOTE, &sa);
-  mg_sock_addr_to_str(&sa, buf, len, flags);
-}
-
-static void mg_socket_if_get_conn_addr(struct mg_connection *nc, int remote,
-                                union socket_address *sa) {
-  if ((nc->flags & MG_F_UDP) && remote) {
-    memcpy(sa, &nc->sa, sizeof(*sa));
-    return;
-  }
-  mg_sock_get_addr(nc->sock, remote, sa);
-}
-
-/* clang-format off */
-#define MG_SOCKET_IFACE_VTABLE                                          \
-  {                                                                     \
-    mg_socket_if_init,                                                  \
-    mg_socket_if_free,                                                  \
-    mg_socket_if_add_conn,                                              \
-    mg_socket_if_remove_conn,                                           \
-    mg_socket_if_poll,                                                  \
-    mg_socket_if_listen_tcp,                                            \
-    mg_socket_if_listen_udp,                                            \
-    mg_socket_if_connect_tcp,                                           \
-    mg_socket_if_connect_udp,                                           \
-    mg_socket_if_tcp_send,                                              \
-    mg_socket_if_udp_send,                                              \
-    mg_socket_if_tcp_recv,                                              \
-    mg_socket_if_udp_recv,                                              \
-    mg_socket_if_create_conn,                                           \
-    mg_socket_if_destroy_conn,                                          \
-    mg_socket_if_sock_set,                                              \
-    mg_socket_if_get_conn_addr,                                         \
-  }
-/* clang-format on */
-
-const struct mg_iface_vtable mg_socket_iface_vtable = MG_SOCKET_IFACE_VTABLE;
-#if MG_NET_IF == MG_NET_IF_SOCKET
-const struct mg_iface_vtable mg_default_iface_vtable = MG_SOCKET_IFACE_VTABLE;
-#endif
-
-#endif /* MG_ENABLE_NET_IF_SOCKET */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_net_if_socks.c"
-#endif
-
-#if MG_ENABLE_SOCKS
-
-struct socksdata {
-  char *proxy_addr;        /* HOST:PORT of the socks5 proxy server */
-  struct mg_connection *s; /* Respective connection to the server */
-  struct mg_connection *c; /* Connection to the client */
-};
-
-static void socks_if_disband(struct socksdata *d) {
-  LOG(LL_DEBUG, ("disbanding proxy %p %p", d->c, d->s));
-  if (d->c) {
-    d->c->flags |= MG_F_SEND_AND_CLOSE;
-    d->c->user_data = NULL;
-    d->c = NULL;
-  }
-  if (d->s) {
-    d->s->flags |= MG_F_SEND_AND_CLOSE;
-    d->s->user_data = NULL;
-    d->s = NULL;
-  }
-}
-
-static void socks_if_relay(struct mg_connection *s) {
-  struct socksdata *d = (struct socksdata *) s->user_data;
-  if (d == NULL || d->c == NULL || !(s->flags & MG_SOCKS_CONNECT_DONE) ||
-      d->s == NULL) {
-    return;
-  }
-  if (s->recv_mbuf.len > 0) mg_if_can_recv_cb(d->c);
-  if (d->c->send_mbuf.len > 0 && s->send_mbuf.len == 0) mg_if_can_send_cb(d->c);
-}
-
-static void socks_if_handler(struct mg_connection *c, int ev, void *ev_data) {
-  struct socksdata *d = (struct socksdata *) c->user_data;
-  if (d == NULL) return;
-  if (ev == MG_EV_CONNECT) {
-    int res = *(int *) ev_data;
-    if (res == 0) {
-      /* Send handshake to the proxy server */
-      unsigned char buf[] = {MG_SOCKS_VERSION, 1, MG_SOCKS_HANDSHAKE_NOAUTH};
-      mg_send(d->s, buf, sizeof(buf));
-      LOG(LL_DEBUG, ("Sent handshake to %s", d->proxy_addr));
-    } else {
-      LOG(LL_ERROR, ("Cannot connect to %s: %d", d->proxy_addr, res));
-      d->c->flags |= MG_F_CLOSE_IMMEDIATELY;
-    }
-  } else if (ev == MG_EV_CLOSE) {
-    socks_if_disband(d);
-  } else if (ev == MG_EV_RECV) {
-    /* Handle handshake reply */
-    if (!(c->flags & MG_SOCKS_HANDSHAKE_DONE)) {
-      /* TODO(lsm): process IPv6 too */
-      unsigned char buf[10] = {MG_SOCKS_VERSION, MG_SOCKS_CMD_CONNECT, 0,
-                               MG_SOCKS_ADDR_IPV4};
-      if (c->recv_mbuf.len < 2) return;
-      if ((unsigned char) c->recv_mbuf.buf[1] == MG_SOCKS_HANDSHAKE_FAILURE) {
-        LOG(LL_ERROR, ("Server kicked us out"));
-        socks_if_disband(d);
-        return;
-      }
-      mbuf_remove(&c->recv_mbuf, 2);
-      c->flags |= MG_SOCKS_HANDSHAKE_DONE;
-
-      /* Send connect request */
-      memcpy(buf + 4, &d->c->sa.sin.sin_addr, 4);
-      memcpy(buf + 8, &d->c->sa.sin.sin_port, 2);
-      mg_send(c, buf, sizeof(buf));
-      LOG(LL_DEBUG, ("%p Sent connect request", c));
-    }
-    /* Process connect request */
-    if ((c->flags & MG_SOCKS_HANDSHAKE_DONE) &&
-        !(c->flags & MG_SOCKS_CONNECT_DONE)) {
-      if (c->recv_mbuf.len < 10) return;
-      if (c->recv_mbuf.buf[1] != MG_SOCKS_SUCCESS) {
-        LOG(LL_ERROR, ("Socks connection error: %d", c->recv_mbuf.buf[1]));
-        socks_if_disband(d);
-        return;
-      }
-      mbuf_remove(&c->recv_mbuf, 10);
-      c->flags |= MG_SOCKS_CONNECT_DONE;
-      LOG(LL_DEBUG, ("%p Connect done %p", c, d->c));
-      mg_if_connect_cb(d->c, 0);
-    }
-    socks_if_relay(c);
-  } else if (ev == MG_EV_SEND || ev == MG_EV_POLL) {
-    socks_if_relay(c);
-  }
-}
-
-static void mg_socks_if_connect_tcp(struct mg_connection *c,
-                                    const union socket_address *sa) {
-  struct socksdata *d = (struct socksdata *) c->iface->data;
-  d->c = c;
-  d->s = mg_connect(c->mgr, d->proxy_addr, socks_if_handler);
-  d->s->user_data = d;
-  LOG(LL_DEBUG, ("%p %s %p %p", c, d->proxy_addr, d, d->s));
-  (void) sa;
-}
-
-static void mg_socks_if_connect_udp(struct mg_connection *c) {
-  (void) c;
-}
-
-static int mg_socks_if_listen_tcp(struct mg_connection *c,
-                                  union socket_address *sa) {
-  (void) c;
-  (void) sa;
-  return 0;
-}
-
-static int mg_socks_if_listen_udp(struct mg_connection *c,
-                                  union socket_address *sa) {
-  (void) c;
-  (void) sa;
-  return -1;
-}
-
-static int mg_socks_if_tcp_send(struct mg_connection *c, const void *buf,
-                                size_t len) {
-  int res;
-  struct socksdata *d = (struct socksdata *) c->iface->data;
-  if (d->s == NULL) return -1;
-  res = (int) mbuf_append(&d->s->send_mbuf, buf, len);
-  DBG(("%p -> %d -> %p", c, res, d->s));
-  return res;
-}
-
-static int mg_socks_if_udp_send(struct mg_connection *c, const void *buf,
-                                size_t len) {
-  (void) c;
-  (void) buf;
-  (void) len;
-  return -1;
-}
-
-int mg_socks_if_tcp_recv(struct mg_connection *c, void *buf, size_t len) {
-  struct socksdata *d = (struct socksdata *) c->iface->data;
-  if (d->s == NULL) return -1;
-  if (len > d->s->recv_mbuf.len) len = d->s->recv_mbuf.len;
-  if (len > 0) {
-    memcpy(buf, d->s->recv_mbuf.buf, len);
-    mbuf_remove(&d->s->recv_mbuf, len);
-  }
-  DBG(("%p <- %d <- %p", c, (int) len, d->s));
-  return len;
-}
-
-int mg_socks_if_udp_recv(struct mg_connection *c, void *buf, size_t len,
-                         union socket_address *sa, size_t *sa_len) {
-  (void) c;
-  (void) buf;
-  (void) len;
-  (void) sa;
-  (void) sa_len;
-  return -1;
-}
-
-static int mg_socks_if_create_conn(struct mg_connection *c) {
-  (void) c;
-  return 1;
-}
-
-static void mg_socks_if_destroy_conn(struct mg_connection *c) {
-  c->iface->vtable->free(c->iface);
-  MG_FREE(c->iface);
-  c->iface = NULL;
-  LOG(LL_DEBUG, ("%p", c));
-}
-
-static void mg_socks_if_sock_set(struct mg_connection *c, sock_t sock) {
-  (void) c;
-  (void) sock;
-}
-
-static void mg_socks_if_init(struct mg_iface *iface) {
-  (void) iface;
-}
-
-static void mg_socks_if_free(struct mg_iface *iface) {
-  struct socksdata *d = (struct socksdata *) iface->data;
-  LOG(LL_DEBUG, ("%p", iface));
-  if (d != NULL) {
-    socks_if_disband(d);
-    MG_FREE(d->proxy_addr);
-    MG_FREE(d);
-    iface->data = NULL;
-  }
-}
-
-static void mg_socks_if_add_conn(struct mg_connection *c) {
-  c->sock = INVALID_SOCKET;
-}
-
-static void mg_socks_if_remove_conn(struct mg_connection *c) {
-  (void) c;
-}
-
-static time_t mg_socks_if_poll(struct mg_iface *iface, int timeout_ms) {
-  LOG(LL_DEBUG, ("%p", iface));
-  (void) iface;
-  (void) timeout_ms;
-  return (time_t) cs_time();
-}
-
-static void mg_socks_if_get_conn_addr(struct mg_connection *c, int remote,
-                                      union socket_address *sa) {
-  LOG(LL_DEBUG, ("%p", c));
-  (void) c;
-  (void) remote;
-  (void) sa;
-}
-
-const struct mg_iface_vtable mg_socks_iface_vtable = {
-    mg_socks_if_init,          mg_socks_if_free,
-    mg_socks_if_add_conn,      mg_socks_if_remove_conn,
-    mg_socks_if_poll,          mg_socks_if_listen_tcp,
-    mg_socks_if_listen_udp,    mg_socks_if_connect_tcp,
-    mg_socks_if_connect_udp,   mg_socks_if_tcp_send,
-    mg_socks_if_udp_send,      mg_socks_if_tcp_recv,
-    mg_socks_if_udp_recv,      mg_socks_if_create_conn,
-    mg_socks_if_destroy_conn,  mg_socks_if_sock_set,
-    mg_socks_if_get_conn_addr,
-};
-
-struct mg_iface *mg_socks_mk_iface(struct mg_mgr *mgr, const char *proxy_addr) {
-  struct mg_iface *iface = mg_if_create_iface(&mg_socks_iface_vtable, mgr);
-  iface->data = MG_CALLOC(1, sizeof(struct socksdata));
-  ((struct socksdata *) iface->data)->proxy_addr = strdup(proxy_addr);
-  return iface;
-}
-
-#endif
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_ssl_if_openssl.c"
-#endif
-
-#if MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_OPENSSL
-
-#ifdef __APPLE__
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-#endif
-
-#include <openssl/ssl.h>
-#include <openssl/err.h>
-#ifndef KR_VERSION
-#include <openssl/tls1.h>
-#endif
-
-static const char *mg_default_session_id_context = "mongoose";
-
-struct mg_ssl_if_ctx {
-  SSL *ssl;
-  SSL_CTX *ssl_ctx;
-  struct mbuf psk;
-  size_t identity_len;
-};
-
-void mg_ssl_if_init(void) {
-  SSL_library_init();
-}
-
-enum mg_ssl_if_result mg_ssl_if_conn_accept(struct mg_connection *nc,
-                                            struct mg_connection *lc) {
-  struct mg_ssl_if_ctx *ctx =
-      (struct mg_ssl_if_ctx *) MG_CALLOC(1, sizeof(*ctx));
-  struct mg_ssl_if_ctx *lc_ctx = (struct mg_ssl_if_ctx *) lc->ssl_if_data;
-  nc->ssl_if_data = ctx;
-  if (ctx == NULL || lc_ctx == NULL) return MG_SSL_ERROR;
-  ctx->ssl_ctx = lc_ctx->ssl_ctx;
-  if ((ctx->ssl = SSL_new(ctx->ssl_ctx)) == NULL) {
-    return MG_SSL_ERROR;
-  }
-  return MG_SSL_OK;
-}
-
-static enum mg_ssl_if_result mg_use_cert(SSL_CTX *ctx, const char *cert,
-                                         const char *key, const char **err_msg);
-static enum mg_ssl_if_result mg_use_ca_cert(SSL_CTX *ctx, const char *cert);
-static enum mg_ssl_if_result mg_set_cipher_list(SSL_CTX *ctx, const char *cl);
-static enum mg_ssl_if_result mg_ssl_if_ossl_set_psk(struct mg_ssl_if_ctx *ctx,
-                                                    const char *identity,
-                                                    const char *key_str);
-
-enum mg_ssl_if_result mg_ssl_if_conn_init(
-    struct mg_connection *nc, const struct mg_ssl_if_conn_params *params,
-    const char **err_msg) {
-  struct mg_ssl_if_ctx *ctx =
-      (struct mg_ssl_if_ctx *) MG_CALLOC(1, sizeof(*ctx));
-  DBG(("%p %s,%s,%s", nc, (params->cert ? params->cert : ""),
-       (params->key ? params->key : ""),
-       (params->ca_cert ? params->ca_cert : "")));
-  if (ctx == NULL) {
-    MG_SET_PTRPTR(err_msg, "Out of memory");
-    return MG_SSL_ERROR;
-  }
-  nc->ssl_if_data = ctx;
-  if (nc->flags & MG_F_LISTENING) {
-    ctx->ssl_ctx = SSL_CTX_new(SSLv23_server_method());
-  } else {
-    ctx->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
-  }
-  if (ctx->ssl_ctx == NULL) {
-    MG_SET_PTRPTR(err_msg, "Failed to create SSL context");
-    return MG_SSL_ERROR;
-  }
-
-#ifndef KR_VERSION
-  /* Disable deprecated protocols. */
-  SSL_CTX_set_options(ctx->ssl_ctx, SSL_OP_NO_SSLv2);
-  SSL_CTX_set_options(ctx->ssl_ctx, SSL_OP_NO_SSLv3);
-  SSL_CTX_set_options(ctx->ssl_ctx, SSL_OP_NO_TLSv1);
-  SSL_CTX_set_session_id_context(ctx->ssl_ctx,
-                                 (void *) mg_default_session_id_context,
-                                 strlen(mg_default_session_id_context));
-#ifdef MG_SSL_OPENSSL_NO_COMPRESSION
-  SSL_CTX_set_options(ctx->ssl_ctx, SSL_OP_NO_COMPRESSION);
-#endif
-#ifdef MG_SSL_OPENSSL_CIPHER_SERVER_PREFERENCE
-  SSL_CTX_set_options(ctx->ssl_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
-#endif
-#else
-/* Krypton only supports TLSv1.2 anyway. */
-#endif
-
-  if (params->cert != NULL &&
-      mg_use_cert(ctx->ssl_ctx, params->cert, params->key, err_msg) !=
-          MG_SSL_OK) {
-    return MG_SSL_ERROR;
-  }
-
-  if (params->ca_cert != NULL &&
-      mg_use_ca_cert(ctx->ssl_ctx, params->ca_cert) != MG_SSL_OK) {
-    MG_SET_PTRPTR(err_msg, "Invalid SSL CA cert");
-    return MG_SSL_ERROR;
-  }
-
-  if (mg_set_cipher_list(ctx->ssl_ctx, params->cipher_suites) != MG_SSL_OK) {
-    MG_SET_PTRPTR(err_msg, "Invalid cipher suite list");
-    return MG_SSL_ERROR;
-  }
-
-  mbuf_init(&ctx->psk, 0);
-  if (mg_ssl_if_ossl_set_psk(ctx, params->psk_identity, params->psk_key) !=
-      MG_SSL_OK) {
-    MG_SET_PTRPTR(err_msg, "Invalid PSK settings");
-    return MG_SSL_ERROR;
-  }
-
-  if (!(nc->flags & MG_F_LISTENING) &&
-      (ctx->ssl = SSL_new(ctx->ssl_ctx)) == NULL) {
-    MG_SET_PTRPTR(err_msg, "Failed to create SSL session");
-    return MG_SSL_ERROR;
-  }
-
-  if (params->server_name != NULL) {
-#ifdef KR_VERSION
-    SSL_CTX_kr_set_verify_name(ctx->ssl_ctx, params->server_name);
-#else
-    SSL_set_tlsext_host_name(ctx->ssl, params->server_name);
-#endif
-  }
-
-  nc->flags |= MG_F_SSL;
-
-  return MG_SSL_OK;
-}
-
-static enum mg_ssl_if_result mg_ssl_if_ssl_err(struct mg_connection *nc,
-                                               int res) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  int err = SSL_get_error(ctx->ssl, res);
-  /*
-   * We've just fetched the last error from the queue.
-   * Now we need to clear the error queue. If we do not, then the following
-   * can happen (actually reported):
-   *  - A new connection is accept()-ed with cert error (e.g. self-signed cert)
-   *  - Since all accept()-ed connections share listener's context,
-   *  - *ALL* SSL accepted connection report read error on the next poll cycle.
-   *    Thus a single errored connection can close all the rest, unrelated ones.
-   * Clearing the error keeps the shared SSL_CTX in an OK state.
-   */
-  ERR_clear_error();
-  if (err == SSL_ERROR_WANT_READ) return MG_SSL_WANT_READ;
-  if (err == SSL_ERROR_WANT_WRITE) return MG_SSL_WANT_WRITE;
-  DBG(("%p %p SSL error: %d %d", nc, ctx->ssl_ctx, res, err));
-  nc->err = err;
-  return MG_SSL_ERROR;
-}
-
-enum mg_ssl_if_result mg_ssl_if_handshake(struct mg_connection *nc) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  int server_side = (nc->listener != NULL);
-  int res;
-  /* If descriptor is not yet set, do it now. */
-  if (SSL_get_fd(ctx->ssl) < 0) {
-    if (SSL_set_fd(ctx->ssl, nc->sock) != 1) return MG_SSL_ERROR;
-  }
-  res = server_side ? SSL_accept(ctx->ssl) : SSL_connect(ctx->ssl);
-  if (res != 1) return mg_ssl_if_ssl_err(nc, res);
-  return MG_SSL_OK;
-}
-
-int mg_ssl_if_read(struct mg_connection *nc, void *buf, size_t buf_size) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  int n = SSL_read(ctx->ssl, buf, buf_size);
-  DBG(("%p %d -> %d", nc, (int) buf_size, n));
-  if (n < 0) return mg_ssl_if_ssl_err(nc, n);
-  if (n == 0) nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-  return n;
-}
-
-int mg_ssl_if_write(struct mg_connection *nc, const void *data, size_t len) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  int n = SSL_write(ctx->ssl, data, len);
-  DBG(("%p %d -> %d", nc, (int) len, n));
-  if (n <= 0) return mg_ssl_if_ssl_err(nc, n);
-  return n;
-}
-
-void mg_ssl_if_conn_close_notify(struct mg_connection *nc) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  if (ctx == NULL) return;
-  SSL_shutdown(ctx->ssl);
-}
-
-void mg_ssl_if_conn_free(struct mg_connection *nc) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  if (ctx == NULL) return;
-  nc->ssl_if_data = NULL;
-  if (ctx->ssl != NULL) SSL_free(ctx->ssl);
-  if (ctx->ssl_ctx != NULL && nc->listener == NULL) SSL_CTX_free(ctx->ssl_ctx);
-  mbuf_free(&ctx->psk);
-  memset(ctx, 0, sizeof(*ctx));
-  MG_FREE(ctx);
-}
-
-/*
- * Cipher suite options used for TLS negotiation.
- * https://wiki.mozilla.org/Security/Server_Side_TLS#Recommended_configurations
- */
-static const char mg_s_cipher_list[] =
-#if defined(MG_SSL_CRYPTO_MODERN)
-    "ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:"
-    "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:"
-    "DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:"
-    "ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:"
-    "ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:"
-    "ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:"
-    "DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:"
-    "DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:"
-    "!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK"
-#elif defined(MG_SSL_CRYPTO_OLD)
-    "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:"
-    "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:"
-    "DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:"
-    "ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:"
-    "ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:"
-    "ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:"
-    "DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:"
-    "DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:"
-    "ECDHE-ECDSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:"
-    "AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:DES-CBC3-SHA:"
-    "HIGH:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:"
-    "!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA"
-#else /* Default - intermediate. */
-    "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:"
-    "ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:"
-    "DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:"
-    "ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:"
-    "ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:"
-    "ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:"
-    "DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:"
-    "DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:"
-    "AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:"
-    "DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:"
-    "!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA"
-#endif
-    ;
-
-/*
- * Default DH params for PFS cipher negotiation. This is a 2048-bit group.
- * Will be used if none are provided by the user in the certificate file.
- */
-#if !MG_DISABLE_PFS && !defined(KR_VERSION)
-static const char mg_s_default_dh_params[] =
-    "\
------BEGIN DH PARAMETERS-----\n\
-MIIBCAKCAQEAlvbgD/qh9znWIlGFcV0zdltD7rq8FeShIqIhkQ0C7hYFThrBvF2E\n\
-Z9bmgaP+sfQwGpVlv9mtaWjvERbu6mEG7JTkgmVUJrUt/wiRzwTaCXBqZkdUO8Tq\n\
-+E6VOEQAilstG90ikN1Tfo+K6+X68XkRUIlgawBTKuvKVwBhuvlqTGerOtnXWnrt\n\
-ym//hd3cd5PBYGBix0i7oR4xdghvfR2WLVu0LgdThTBb6XP7gLd19cQ1JuBtAajZ\n\
-wMuPn7qlUkEFDIkAZy59/Hue/H2Q2vU/JsvVhHWCQBL4F1ofEAt50il6ZxR1QfFK\n\
-9VGKDC4oOgm9DlxwwBoC2FjqmvQlqVV3kwIBAg==\n\
------END DH PARAMETERS-----\n";
-#endif
-
-static enum mg_ssl_if_result mg_use_ca_cert(SSL_CTX *ctx, const char *cert) {
-  if (cert == NULL || strcmp(cert, "*") == 0) {
-    return MG_SSL_OK;
-  }
-  SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, 0);
-  return SSL_CTX_load_verify_locations(ctx, cert, NULL) == 1 ? MG_SSL_OK
-                                                             : MG_SSL_ERROR;
-}
-
-static enum mg_ssl_if_result mg_use_cert(SSL_CTX *ctx, const char *cert,
-                                         const char *key,
-                                         const char **err_msg) {
-  if (key == NULL) key = cert;
-  if (cert == NULL || cert[0] == '\0' || key == NULL || key[0] == '\0') {
-    return MG_SSL_OK;
-  } else if (SSL_CTX_use_certificate_file(ctx, cert, 1) == 0) {
-    MG_SET_PTRPTR(err_msg, "Invalid SSL cert");
-    return MG_SSL_ERROR;
-  } else if (SSL_CTX_use_PrivateKey_file(ctx, key, 1) == 0) {
-    MG_SET_PTRPTR(err_msg, "Invalid SSL key");
-    return MG_SSL_ERROR;
-  } else if (SSL_CTX_use_certificate_chain_file(ctx, cert) == 0) {
-    MG_SET_PTRPTR(err_msg, "Invalid CA bundle");
-    return MG_SSL_ERROR;
-  } else {
-    SSL_CTX_set_mode(ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
-#if !MG_DISABLE_PFS && !defined(KR_VERSION)
-    BIO *bio = NULL;
-    DH *dh = NULL;
-
-    /* Try to read DH parameters from the cert/key file. */
-    bio = BIO_new_file(cert, "r");
-    if (bio != NULL) {
-      dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
-      BIO_free(bio);
-    }
-    /*
-     * If there are no DH params in the file, fall back to hard-coded ones.
-     * Not ideal, but better than nothing.
-     */
-    if (dh == NULL) {
-      bio = BIO_new_mem_buf((void *) mg_s_default_dh_params, -1);
-      dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
-      BIO_free(bio);
-    }
-    if (dh != NULL) {
-      SSL_CTX_set_tmp_dh(ctx, dh);
-      SSL_CTX_set_options(ctx, SSL_OP_SINGLE_DH_USE);
-      DH_free(dh);
-    }
-#if OPENSSL_VERSION_NUMBER > 0x10002000L
-    SSL_CTX_set_ecdh_auto(ctx, 1);
-#endif
-#endif
-  }
-  return MG_SSL_OK;
-}
-
-static enum mg_ssl_if_result mg_set_cipher_list(SSL_CTX *ctx, const char *cl) {
-  return (SSL_CTX_set_cipher_list(ctx, cl ? cl : mg_s_cipher_list) == 1
-              ? MG_SSL_OK
-              : MG_SSL_ERROR);
-}
-
-#if !defined(KR_VERSION) && !defined(LIBRESSL_VERSION_NUMBER)
-static unsigned int mg_ssl_if_ossl_psk_cb(SSL *ssl, const char *hint,
-                                          char *identity,
-                                          unsigned int max_identity_len,
-                                          unsigned char *psk,
-                                          unsigned int max_psk_len) {
-  struct mg_ssl_if_ctx *ctx =
-      (struct mg_ssl_if_ctx *) SSL_CTX_get_app_data(SSL_get_SSL_CTX(ssl));
-  size_t key_len = ctx->psk.len - ctx->identity_len - 1;
-  DBG(("hint: '%s'", (hint ? hint : "")));
-  if (ctx->identity_len + 1 > max_identity_len) {
-    DBG(("identity too long"));
-    return 0;
-  }
-  if (key_len > max_psk_len) {
-    DBG(("key too long"));
-    return 0;
-  }
-  memcpy(identity, ctx->psk.buf, ctx->identity_len + 1);
-  memcpy(psk, ctx->psk.buf + ctx->identity_len + 1, key_len);
-  (void) ssl;
-  return key_len;
-}
-
-static enum mg_ssl_if_result mg_ssl_if_ossl_set_psk(struct mg_ssl_if_ctx *ctx,
-                                                    const char *identity,
-                                                    const char *key_str) {
-  unsigned char key[32];
-  size_t key_len;
-  size_t i = 0;
-  if (identity == NULL && key_str == NULL) return MG_SSL_OK;
-  if (identity == NULL || key_str == NULL) return MG_SSL_ERROR;
-  key_len = strlen(key_str);
-  if (key_len != 32 && key_len != 64) return MG_SSL_ERROR;
-  memset(key, 0, sizeof(key));
-  key_len = 0;
-  for (i = 0; key_str[i] != '\0'; i++) {
-    unsigned char c;
-    char hc = tolower((int) key_str[i]);
-    if (hc >= '0' && hc <= '9') {
-      c = hc - '0';
-    } else if (hc >= 'a' && hc <= 'f') {
-      c = hc - 'a' + 0xa;
-    } else {
-      return MG_SSL_ERROR;
-    }
-    key_len = i / 2;
-    key[key_len] <<= 4;
-    key[key_len] |= c;
-  }
-  key_len++;
-  DBG(("identity = '%s', key = (%u)", identity, (unsigned int) key_len));
-  ctx->identity_len = strlen(identity);
-  mbuf_append(&ctx->psk, identity, ctx->identity_len + 1);
-  mbuf_append(&ctx->psk, key, key_len);
-  SSL_CTX_set_psk_client_callback(ctx->ssl_ctx, mg_ssl_if_ossl_psk_cb);
-  SSL_CTX_set_app_data(ctx->ssl_ctx, ctx);
-  return MG_SSL_OK;
-}
-#else
-static enum mg_ssl_if_result mg_ssl_if_ossl_set_psk(struct mg_ssl_if_ctx *ctx,
-                                                    const char *identity,
-                                                    const char *key_str) {
-  (void) ctx;
-  (void) identity;
-  (void) key_str;
-  /* Krypton / LibreSSL does not support PSK. */
-  return MG_SSL_ERROR;
-}
-#endif /* !defined(KR_VERSION) && !defined(LIBRESSL_VERSION_NUMBER) */
-
-const char *mg_set_ssl(struct mg_connection *nc, const char *cert,
-                       const char *ca_cert) {
-  const char *err_msg = NULL;
-  struct mg_ssl_if_conn_params params;
-  memset(&params, 0, sizeof(params));
-  params.cert = cert;
-  params.ca_cert = ca_cert;
-  if (mg_ssl_if_conn_init(nc, &params, &err_msg) != MG_SSL_OK) {
-    return err_msg;
-  }
-  return NULL;
-}
-
-#endif /* MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_OPENSSL */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_ssl_if_mbedtls.c"
-#endif
-
-#if MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_MBEDTLS
-
-#include <mbedtls/debug.h>
-#include <mbedtls/ecp.h>
-#include <mbedtls/net.h>
-#include <mbedtls/platform.h>
-#include <mbedtls/ssl.h>
-#include <mbedtls/ssl_internal.h>
-#include <mbedtls/x509_crt.h>
-#include <mbedtls/version.h>
-
-static void mg_ssl_mbed_log(void *ctx, int level, const char *file, int line,
-                            const char *str) {
-  enum cs_log_level cs_level;
-  switch (level) {
-    case 1:
-      cs_level = LL_ERROR;
-      break;
-    case 2:
-      cs_level = LL_INFO;
-      break;
-    case 3:
-      cs_level = LL_DEBUG;
-      break;
-    default:
-      cs_level = LL_VERBOSE_DEBUG;
-  }
-  /* mbedTLS passes strings with \n at the end, strip it. */
-  LOG(cs_level, ("%p %.*s", ctx, (int) (strlen(str) - 1), str));
-  (void) ctx;
-  (void) str;
-  (void) file;
-  (void) line;
-  (void) cs_level;
-}
-
-struct mg_ssl_if_ctx {
-  mbedtls_ssl_config *conf;
-  mbedtls_ssl_context *ssl;
-  mbedtls_x509_crt *cert;
-  mbedtls_pk_context *key;
-#ifdef MBEDTLS_X509_CA_CHAIN_ON_DISK
-  char *ca_chain_file;
-#else
-  mbedtls_x509_crt *ca_cert;
-#endif
-  struct mbuf cipher_suites;
-  size_t saved_len;
-};
-
-/* Must be provided by the platform. ctx is struct mg_connection. */
-extern int mg_ssl_if_mbed_random(void *ctx, unsigned char *buf, size_t len);
-
-void mg_ssl_if_init(void) {
-  LOG(LL_INFO, ("%s", MBEDTLS_VERSION_STRING_FULL));
-}
-
-enum mg_ssl_if_result mg_ssl_if_conn_accept(struct mg_connection *nc,
-                                            struct mg_connection *lc) {
-  struct mg_ssl_if_ctx *ctx =
-      (struct mg_ssl_if_ctx *) MG_CALLOC(1, sizeof(*ctx));
-  struct mg_ssl_if_ctx *lc_ctx = (struct mg_ssl_if_ctx *) lc->ssl_if_data;
-  nc->ssl_if_data = ctx;
-  if (ctx == NULL || lc_ctx == NULL) return MG_SSL_ERROR;
-  ctx->ssl = (mbedtls_ssl_context *) MG_CALLOC(1, sizeof(*ctx->ssl));
-  if (mbedtls_ssl_setup(ctx->ssl, lc_ctx->conf) != 0) {
-    return MG_SSL_ERROR;
-  }
-  return MG_SSL_OK;
-}
-
-static enum mg_ssl_if_result mg_use_cert(struct mg_ssl_if_ctx *ctx,
-                                         const char *cert, const char *key,
-                                         const char **err_msg);
-static enum mg_ssl_if_result mg_use_ca_cert(struct mg_ssl_if_ctx *ctx,
-                                            const char *cert);
-static enum mg_ssl_if_result mg_set_cipher_list(struct mg_ssl_if_ctx *ctx,
-                                                const char *ciphers);
-#ifdef MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED
-static enum mg_ssl_if_result mg_ssl_if_mbed_set_psk(struct mg_ssl_if_ctx *ctx,
-                                                    const char *identity,
-                                                    const char *key);
-#endif
-
-enum mg_ssl_if_result mg_ssl_if_conn_init(
-    struct mg_connection *nc, const struct mg_ssl_if_conn_params *params,
-    const char **err_msg) {
-  struct mg_ssl_if_ctx *ctx =
-      (struct mg_ssl_if_ctx *) MG_CALLOC(1, sizeof(*ctx));
-  DBG(("%p %s,%s,%s", nc, (params->cert ? params->cert : ""),
-       (params->key ? params->key : ""),
-       (params->ca_cert ? params->ca_cert : "")));
-
-  if (ctx == NULL) {
-    MG_SET_PTRPTR(err_msg, "Out of memory");
-    return MG_SSL_ERROR;
-  }
-  nc->ssl_if_data = ctx;
-  ctx->conf = (mbedtls_ssl_config *) MG_CALLOC(1, sizeof(*ctx->conf));
-  mbuf_init(&ctx->cipher_suites, 0);
-  mbedtls_ssl_config_init(ctx->conf);
-  mbedtls_ssl_conf_dbg(ctx->conf, mg_ssl_mbed_log, nc);
-  if (mbedtls_ssl_config_defaults(
-          ctx->conf, (nc->flags & MG_F_LISTENING ? MBEDTLS_SSL_IS_SERVER
-                                                 : MBEDTLS_SSL_IS_CLIENT),
-          MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_PRESET_DEFAULT) != 0) {
-    MG_SET_PTRPTR(err_msg, "Failed to init SSL config");
-    return MG_SSL_ERROR;
-  }
-
-  /* TLS 1.2 and up */
-  mbedtls_ssl_conf_min_version(ctx->conf, MBEDTLS_SSL_MAJOR_VERSION_3,
-                               MBEDTLS_SSL_MINOR_VERSION_3);
-  mbedtls_ssl_conf_rng(ctx->conf, mg_ssl_if_mbed_random, nc);
-
-  if (params->cert != NULL &&
-      mg_use_cert(ctx, params->cert, params->key, err_msg) != MG_SSL_OK) {
-    return MG_SSL_ERROR;
-  }
-
-  if (params->ca_cert != NULL &&
-      mg_use_ca_cert(ctx, params->ca_cert) != MG_SSL_OK) {
-    MG_SET_PTRPTR(err_msg, "Invalid SSL CA cert");
-    return MG_SSL_ERROR;
-  }
-
-  if (mg_set_cipher_list(ctx, params->cipher_suites) != MG_SSL_OK) {
-    MG_SET_PTRPTR(err_msg, "Invalid cipher suite list");
-    return MG_SSL_ERROR;
-  }
-
-#ifdef MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED
-  if (mg_ssl_if_mbed_set_psk(ctx, params->psk_identity, params->psk_key) !=
-      MG_SSL_OK) {
-    MG_SET_PTRPTR(err_msg, "Invalid PSK settings");
-    return MG_SSL_ERROR;
-  }
-#endif
-
-  if (!(nc->flags & MG_F_LISTENING)) {
-    ctx->ssl = (mbedtls_ssl_context *) MG_CALLOC(1, sizeof(*ctx->ssl));
-    mbedtls_ssl_init(ctx->ssl);
-    if (mbedtls_ssl_setup(ctx->ssl, ctx->conf) != 0) {
-      MG_SET_PTRPTR(err_msg, "Failed to create SSL session");
-      return MG_SSL_ERROR;
-    }
-    if (params->server_name != NULL &&
-        mbedtls_ssl_set_hostname(ctx->ssl, params->server_name) != 0) {
-      return MG_SSL_ERROR;
-    }
-  }
-
-#ifdef MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN
-  if (mbedtls_ssl_conf_max_frag_len(ctx->conf,
-#if MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN == 512
-                                    MBEDTLS_SSL_MAX_FRAG_LEN_512
-#elif MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN == 1024
-                                    MBEDTLS_SSL_MAX_FRAG_LEN_1024
-#elif MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN == 2048
-                                    MBEDTLS_SSL_MAX_FRAG_LEN_2048
-#elif MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN == 4096
-                                    MBEDTLS_SSL_MAX_FRAG_LEN_4096
-#else
-#error Invalid MG_SSL_IF_MBEDTLS_MAX_FRAG_LEN
-#endif
-                                    ) != 0) {
-    return MG_SSL_ERROR;
-  }
-#endif
-
-  nc->flags |= MG_F_SSL;
-
-  return MG_SSL_OK;
-}
-
-static int mg_ssl_if_mbed_send(void *ctx, const unsigned char *buf,
-                               size_t len) {
-  struct mg_connection *nc = (struct mg_connection *) ctx;
-  int n = nc->iface->vtable->tcp_send(nc, buf, len);
-  if (n > 0) return n;
-  if (n == 0) return MBEDTLS_ERR_SSL_WANT_WRITE;
-  return MBEDTLS_ERR_NET_SEND_FAILED;
-}
-
-static int mg_ssl_if_mbed_recv(void *ctx, unsigned char *buf, size_t len) {
-  struct mg_connection *nc = (struct mg_connection *) ctx;
-  int n = nc->iface->vtable->tcp_recv(nc, buf, len);
-  if (n > 0) return n;
-  if (n == 0) return MBEDTLS_ERR_SSL_WANT_READ;
-  return MBEDTLS_ERR_NET_RECV_FAILED;
-}
-
-static enum mg_ssl_if_result mg_ssl_if_mbed_err(struct mg_connection *nc,
-                                                int ret) {
-  enum mg_ssl_if_result res = MG_SSL_OK;
-  if (ret == MBEDTLS_ERR_SSL_WANT_READ) {
-    res = MG_SSL_WANT_READ;
-  } else if (ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
-    res = MG_SSL_WANT_WRITE;
-  } else if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
-    LOG(LL_DEBUG, ("%p TLS connection closed by peer", nc));
-    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-    res = MG_SSL_OK;
-  } else {
-    LOG(LL_ERROR, ("%p mbedTLS error: -0x%04x", nc, -ret));
-    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-    res = MG_SSL_ERROR;
-  }
-  nc->err = ret;
-  return res;
-}
-
-static void mg_ssl_if_mbed_free_certs_and_keys(struct mg_ssl_if_ctx *ctx) {
-  if (ctx->cert != NULL) {
-    mbedtls_x509_crt_free(ctx->cert);
-    MG_FREE(ctx->cert);
-    ctx->cert = NULL;
-    mbedtls_pk_free(ctx->key);
-    MG_FREE(ctx->key);
-    ctx->key = NULL;
-  }
-#ifdef MBEDTLS_X509_CA_CHAIN_ON_DISK
-  MG_FREE(ctx->ca_chain_file);
-  ctx->ca_chain_file = NULL;
-#else
-  if (ctx->ca_cert != NULL) {
-    mbedtls_ssl_conf_ca_chain(ctx->conf, NULL, NULL);
-    mbedtls_x509_crt_free(ctx->ca_cert);
-    MG_FREE(ctx->ca_cert);
-    ctx->ca_cert = NULL;
-  }
-#endif
-}
-
-enum mg_ssl_if_result mg_ssl_if_handshake(struct mg_connection *nc) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  int err;
-  /* If bio is not yet set, do it now. */
-  if (ctx->ssl->p_bio == NULL) {
-    mbedtls_ssl_set_bio(ctx->ssl, nc, mg_ssl_if_mbed_send, mg_ssl_if_mbed_recv,
-                        NULL);
-  }
-  err = mbedtls_ssl_handshake(ctx->ssl);
-  if (err != 0) return mg_ssl_if_mbed_err(nc, err);
-#ifdef MG_SSL_IF_MBEDTLS_FREE_CERTS
-  /*
-   * Free the peer certificate, we don't need it after handshake.
-   * Note that this effectively disables renegotiation.
-   */
-  mbedtls_x509_crt_free(ctx->ssl->session->peer_cert);
-  mbedtls_free(ctx->ssl->session->peer_cert);
-  ctx->ssl->session->peer_cert = NULL;
-  /* On a client connection we can also free our own and CA certs. */
-  if (nc->listener == NULL) {
-    if (ctx->conf->key_cert != NULL) {
-      /* Note that this assumes one key_cert entry, which matches our init. */
-      MG_FREE(ctx->conf->key_cert);
-      ctx->conf->key_cert = NULL;
-    }
-    mbedtls_ssl_conf_ca_chain(ctx->conf, NULL, NULL);
-    mg_ssl_if_mbed_free_certs_and_keys(ctx);
-  }
-#endif
-  return MG_SSL_OK;
-}
-
-int mg_ssl_if_read(struct mg_connection *nc, void *buf, size_t len) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  int n = mbedtls_ssl_read(ctx->ssl, (unsigned char *) buf, len);
-  DBG(("%p %d -> %d", nc, (int) len, n));
-  if (n < 0) return mg_ssl_if_mbed_err(nc, n);
-  if (n == 0) nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-  return n;
-}
-
-int mg_ssl_if_write(struct mg_connection *nc, const void *buf, size_t len) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  /* Per mbedTLS docs, if write returns WANT_READ or WANT_WRITE, the operation
-   * should be retried with the same data and length.
-   * Here we assume that the data being pushed will remain the same but the
-   * amount may grow between calls so we save the length that was used and
-   * retry. The assumption being that the data itself won't change and won't
-   * be removed. */
-  size_t l = len;
-  if (ctx->saved_len > 0 && ctx->saved_len < l) l = ctx->saved_len;
-  int n = mbedtls_ssl_write(ctx->ssl, (const unsigned char *) buf, l);
-  DBG(("%p %d,%d,%d -> %d", nc, (int) len, (int) ctx->saved_len, (int) l, n));
-  if (n < 0) {
-    if (n == MBEDTLS_ERR_SSL_WANT_READ || n == MBEDTLS_ERR_SSL_WANT_WRITE) {
-      ctx->saved_len = len;
-    }
-    return mg_ssl_if_mbed_err(nc, n);
-  } else if (n > 0) {
-    ctx->saved_len = 0;
-  }
-  return n;
-}
-
-void mg_ssl_if_conn_close_notify(struct mg_connection *nc) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  if (ctx == NULL) return;
-  mbedtls_ssl_close_notify(ctx->ssl);
-}
-
-void mg_ssl_if_conn_free(struct mg_connection *nc) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  if (ctx == NULL) return;
-  nc->ssl_if_data = NULL;
-  if (ctx->ssl != NULL) {
-    mbedtls_ssl_free(ctx->ssl);
-    MG_FREE(ctx->ssl);
-  }
-  if (ctx->conf != NULL) {
-    mbedtls_ssl_config_free(ctx->conf);
-    MG_FREE(ctx->conf);
-  }
-  mg_ssl_if_mbed_free_certs_and_keys(ctx);
-  mbuf_free(&ctx->cipher_suites);
-  memset(ctx, 0, sizeof(*ctx));
-  MG_FREE(ctx);
-}
-
-static enum mg_ssl_if_result mg_use_ca_cert(struct mg_ssl_if_ctx *ctx,
-                                            const char *ca_cert) {
-  if (ca_cert == NULL || strcmp(ca_cert, "*") == 0) {
-    mbedtls_ssl_conf_authmode(ctx->conf, MBEDTLS_SSL_VERIFY_NONE);
-    return MG_SSL_OK;
-  }
-#ifdef MBEDTLS_X509_CA_CHAIN_ON_DISK
-  ctx->ca_chain_file = strdup(ca_cert);
-  if (ctx->ca_chain_file == NULL) return MG_SSL_ERROR;
-  if (mbedtls_ssl_conf_ca_chain_file(ctx->conf, ctx->ca_chain_file, NULL) != 0) {
-    return MG_SSL_ERROR;
-  }
-#else
-  ctx->ca_cert = (mbedtls_x509_crt *) MG_CALLOC(1, sizeof(*ctx->ca_cert));
-  mbedtls_x509_crt_init(ctx->ca_cert);
-  if (mbedtls_x509_crt_parse_file(ctx->ca_cert, ca_cert) != 0) {
-    return MG_SSL_ERROR;
-  }
-  mbedtls_ssl_conf_ca_chain(ctx->conf, ctx->ca_cert, NULL);
-#endif
-  mbedtls_ssl_conf_authmode(ctx->conf, MBEDTLS_SSL_VERIFY_REQUIRED);
-  return MG_SSL_OK;
-}
-
-static enum mg_ssl_if_result mg_use_cert(struct mg_ssl_if_ctx *ctx,
-                                         const char *cert, const char *key,
-                                         const char **err_msg) {
-  if (key == NULL) key = cert;
-  if (cert == NULL || cert[0] == '\0' || key == NULL || key[0] == '\0') {
-    return MG_SSL_OK;
-  }
-  ctx->cert = (mbedtls_x509_crt *) MG_CALLOC(1, sizeof(*ctx->cert));
-  mbedtls_x509_crt_init(ctx->cert);
-  ctx->key = (mbedtls_pk_context *) MG_CALLOC(1, sizeof(*ctx->key));
-  mbedtls_pk_init(ctx->key);
-  if (mbedtls_x509_crt_parse_file(ctx->cert, cert) != 0) {
-    MG_SET_PTRPTR(err_msg, "Invalid SSL cert");
-    return MG_SSL_ERROR;
-  }
-  if (mbedtls_pk_parse_keyfile(ctx->key, key, NULL) != 0) {
-    MG_SET_PTRPTR(err_msg, "Invalid SSL key");
-    return MG_SSL_ERROR;
-  }
-  if (mbedtls_ssl_conf_own_cert(ctx->conf, ctx->cert, ctx->key) != 0) {
-    MG_SET_PTRPTR(err_msg, "Invalid SSL key or cert");
-    return MG_SSL_ERROR;
-  }
-  return MG_SSL_OK;
-}
-
-static const int mg_s_cipher_list[] = {
-#if CS_PLATFORM != CS_P_ESP8266
-    MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
-    MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
-    MBEDTLS_TLS_RSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA,
-#else
-    /*
-     * ECDHE is way too slow on ESP8266 w/o cryptochip, this sometimes results
-     * in WiFi STA deauths. Use weaker but faster cipher suites. Sad but true.
-     * Disable DHE completely because it's just hopelessly slow.
-     */
-    MBEDTLS_TLS_RSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
-    MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256,
-    MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256,
-    MBEDTLS_TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
-    MBEDTLS_TLS_RSA_WITH_AES_128_CBC_SHA,
-#endif /* CS_PLATFORM != CS_P_ESP8266 */
-    0,
-};
-
-/*
- * Ciphers can be specified as a colon-separated list of cipher suite names.
- * These can be found in
- * https://github.com/ARMmbed/mbedtls/blob/development/library/ssl_ciphersuites.c#L267
- * E.g.: TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256:TLS-DHE-RSA-WITH-AES-256-CCM
- */
-static enum mg_ssl_if_result mg_set_cipher_list(struct mg_ssl_if_ctx *ctx,
-                                                const char *ciphers) {
-  if (ciphers != NULL) {
-    int l, id;
-    const char *s = ciphers, *e;
-    char tmp[50];
-    while (s != NULL) {
-      e = strchr(s, ':');
-      l = (e != NULL ? (e - s) : (int) strlen(s));
-      strncpy(tmp, s, l);
-      tmp[l] = '\0';
-      id = mbedtls_ssl_get_ciphersuite_id(tmp);
-      DBG(("%s -> %04x", tmp, id));
-      if (id != 0) {
-        mbuf_append(&ctx->cipher_suites, &id, sizeof(id));
-      }
-      s = (e != NULL ? e + 1 : NULL);
-    }
-    if (ctx->cipher_suites.len == 0) return MG_SSL_ERROR;
-    id = 0;
-    mbuf_append(&ctx->cipher_suites, &id, sizeof(id));
-    mbuf_trim(&ctx->cipher_suites);
-    mbedtls_ssl_conf_ciphersuites(ctx->conf,
-                                  (const int *) ctx->cipher_suites.buf);
-  } else {
-    mbedtls_ssl_conf_ciphersuites(ctx->conf, mg_s_cipher_list);
-  }
-  return MG_SSL_OK;
-}
-
-#ifdef MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED
-static enum mg_ssl_if_result mg_ssl_if_mbed_set_psk(struct mg_ssl_if_ctx *ctx,
-                                                    const char *identity,
-                                                    const char *key_str) {
-  unsigned char key[32];
-  size_t key_len;
-  if (identity == NULL && key_str == NULL) return MG_SSL_OK;
-  if (identity == NULL || key_str == NULL) return MG_SSL_ERROR;
-  key_len = strlen(key_str);
-  if (key_len != 32 && key_len != 64) return MG_SSL_ERROR;
-  size_t i = 0;
-  memset(key, 0, sizeof(key));
-  key_len = 0;
-  for (i = 0; key_str[i] != '\0'; i++) {
-    unsigned char c;
-    char hc = tolower((int) key_str[i]);
-    if (hc >= '0' && hc <= '9') {
-      c = hc - '0';
-    } else if (hc >= 'a' && hc <= 'f') {
-      c = hc - 'a' + 0xa;
-    } else {
-      return MG_SSL_ERROR;
-    }
-    key_len = i / 2;
-    key[key_len] <<= 4;
-    key[key_len] |= c;
-  }
-  key_len++;
-  DBG(("identity = '%s', key = (%u)", identity, (unsigned int) key_len));
-  /* mbedTLS makes copies of psk and identity. */
-  if (mbedtls_ssl_conf_psk(ctx->conf, (const unsigned char *) key, key_len,
-                           (const unsigned char *) identity,
-                           strlen(identity)) != 0) {
-    return MG_SSL_ERROR;
-  }
-  return MG_SSL_OK;
-}
-#endif
-
-const char *mg_set_ssl(struct mg_connection *nc, const char *cert,
-                       const char *ca_cert) {
-  const char *err_msg = NULL;
-  struct mg_ssl_if_conn_params params;
-  memset(&params, 0, sizeof(params));
-  params.cert = cert;
-  params.ca_cert = ca_cert;
-  if (mg_ssl_if_conn_init(nc, &params, &err_msg) != MG_SSL_OK) {
-    return err_msg;
-  }
-  return NULL;
-}
-
-/* Lazy RNG. Warning: it would be a bad idea to do this in production! */
-#ifdef MG_SSL_MBED_DUMMY_RANDOM
-int mg_ssl_if_mbed_random(void *ctx, unsigned char *buf, size_t len) {
-  (void) ctx;
-  while (len--) *buf++ = rand();
-  return 0;
-}
-#endif
-
-#endif /* MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_MBEDTLS */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_uri.c"
-#endif
-
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_uri.h" */
-
-/*
- * scan string until encountering one of `seps`, keeping track of component
- * boundaries in `res`.
- *
- * `p` will point to the char after the separator or it will be `end`.
- */
-static void parse_uri_component(const char **p, const char *end,
-                                const char *seps, struct mg_str *res) {
-  const char *q;
-  res->p = *p;
-  for (; *p < end; (*p)++) {
-    for (q = seps; *q != '\0'; q++) {
-      if (**p == *q) break;
-    }
-    if (*q != '\0') break;
-  }
-  res->len = (*p) - res->p;
-  if (*p < end) (*p)++;
-}
-
-int mg_parse_uri(const struct mg_str uri, struct mg_str *scheme,
-                 struct mg_str *user_info, struct mg_str *host,
-                 unsigned int *port, struct mg_str *path, struct mg_str *query,
-                 struct mg_str *fragment) {
-  struct mg_str rscheme = {0, 0}, ruser_info = {0, 0}, rhost = {0, 0},
-                rpath = {0, 0}, rquery = {0, 0}, rfragment = {0, 0};
-  unsigned int rport = 0;
-  enum {
-    P_START,
-    P_SCHEME_OR_PORT,
-    P_USER_INFO,
-    P_HOST,
-    P_PORT,
-    P_REST
-  } state = P_START;
-
-  const char *p = uri.p, *end = p + uri.len;
-  while (p < end) {
-    switch (state) {
-      case P_START:
-        /*
-         * expecting on of:
-         * - `scheme://xxxx`
-         * - `xxxx:port`
-         * - `[a:b:c]:port`
-         * - `xxxx/path`
-         */
-        if (*p == '[') {
-          state = P_HOST;
-          break;
-        }
-        for (; p < end; p++) {
-          if (*p == ':') {
-            state = P_SCHEME_OR_PORT;
-            break;
-          } else if (*p == '/') {
-            state = P_REST;
-            break;
-          }
-        }
-        if (state == P_START || state == P_REST) {
-          rhost.p = uri.p;
-          rhost.len = p - uri.p;
-        }
-        break;
-      case P_SCHEME_OR_PORT:
-        if (end - p >= 3 && strncmp(p, "://", 3) == 0) {
-          rscheme.p = uri.p;
-          rscheme.len = p - uri.p;
-          state = P_USER_INFO;
-          p += 3;
-        } else {
-          rhost.p = uri.p;
-          rhost.len = p - uri.p;
-          state = P_PORT;
-        }
-        break;
-      case P_USER_INFO:
-        ruser_info.p = p;
-        for (; p < end; p++) {
-          if (*p == '@' || *p == '[' || *p == '/') {
-            break;
-          }
-        }
-        if (p == end || *p == '/' || *p == '[') {
-          /* backtrack and parse as host */
-          p = ruser_info.p;
-        }
-        ruser_info.len = p - ruser_info.p;
-        state = P_HOST;
-        break;
-      case P_HOST:
-        if (*p == '@') p++;
-        rhost.p = p;
-        if (*p == '[') {
-          int found = 0;
-          for (; !found && p < end; p++) {
-            found = (*p == ']');
-          }
-          if (!found) return -1;
-        } else {
-          for (; p < end; p++) {
-            if (*p == ':' || *p == '/') break;
-          }
-        }
-        rhost.len = p - rhost.p;
-        if (p < end) {
-          if (*p == ':') {
-            state = P_PORT;
-            break;
-          } else if (*p == '/') {
-            state = P_REST;
-            break;
-          }
-        }
-        break;
-      case P_PORT:
-        p++;
-        for (; p < end; p++) {
-          if (*p == '/') {
-            state = P_REST;
-            break;
-          }
-          rport *= 10;
-          rport += *p - '0';
-        }
-        break;
-      case P_REST:
-        /* `p` points to separator. `path` includes the separator */
-        parse_uri_component(&p, end, "?#", &rpath);
-        if (p < end && *(p - 1) == '?') {
-          parse_uri_component(&p, end, "#", &rquery);
-        }
-        parse_uri_component(&p, end, "", &rfragment);
-        break;
-    }
-  }
-
-  if (scheme != 0) *scheme = rscheme;
-  if (user_info != 0) *user_info = ruser_info;
-  if (host != 0) *host = rhost;
-  if (port != 0) *port = rport;
-  if (path != 0) *path = rpath;
-  if (query != 0) *query = rquery;
-  if (fragment != 0) *fragment = rfragment;
-
-  return 0;
-}
-
-/* Normalize the URI path. Remove/resolve "." and "..". */
-int mg_normalize_uri_path(const struct mg_str *in, struct mg_str *out) {
-  const char *s = in->p, *se = s + in->len;
-  char *cp = (char *) out->p, *d;
-
-  if (in->len == 0 || *s != '/') {
-    out->len = 0;
-    return 0;
-  }
-
-  d = cp;
-
-  while (s < se) {
-    const char *next = s;
-    struct mg_str component;
-    parse_uri_component(&next, se, "/", &component);
-    if (mg_vcmp(&component, ".") == 0) {
-      /* Yum. */
-    } else if (mg_vcmp(&component, "..") == 0) {
-      /* Backtrack to previous slash. */
-      if (d > cp + 1 && *(d - 1) == '/') d--;
-      while (d > cp && *(d - 1) != '/') d--;
-    } else {
-      memmove(d, s, next - s);
-      d += next - s;
-    }
-    s = next;
-  }
-  if (d == cp) *d++ = '/';
-
-  out->p = cp;
-  out->len = d - cp;
-  return 1;
-}
-
-int mg_assemble_uri(const struct mg_str *scheme, const struct mg_str *user_info,
-                    const struct mg_str *host, unsigned int port,
-                    const struct mg_str *path, const struct mg_str *query,
-                    const struct mg_str *fragment, int normalize_path,
-                    struct mg_str *uri) {
-  int result = -1;
-  struct mbuf out;
-  mbuf_init(&out, 0);
-
-  if (scheme != NULL && scheme->len > 0) {
-    mbuf_append(&out, scheme->p, scheme->len);
-    mbuf_append(&out, "://", 3);
-  }
-
-  if (user_info != NULL && user_info->len > 0) {
-    mbuf_append(&out, user_info->p, user_info->len);
-    mbuf_append(&out, "@", 1);
-  }
-
-  if (host != NULL && host->len > 0) {
-    mbuf_append(&out, host->p, host->len);
-  }
-
-  if (port != 0) {
-    char port_str[20];
-    int port_str_len = sprintf(port_str, ":%u", port);
-    mbuf_append(&out, port_str, port_str_len);
-  }
-
-  if (path != NULL && path->len > 0) {
-    if (normalize_path) {
-      struct mg_str npath = mg_strdup(*path);
-      if (npath.len != path->len) goto out;
-      if (!mg_normalize_uri_path(path, &npath)) {
-        free((void *) npath.p);
-        goto out;
-      }
-      mbuf_append(&out, npath.p, npath.len);
-      free((void *) npath.p);
-    } else {
-      mbuf_append(&out, path->p, path->len);
-    }
-  } else if (normalize_path) {
-    mbuf_append(&out, "/", 1);
-  }
-
-  if (query != NULL && query->len > 0) {
-    mbuf_append(&out, "?", 1);
-    mbuf_append(&out, query->p, query->len);
-  }
-
-  if (fragment != NULL && fragment->len > 0) {
-    mbuf_append(&out, "#", 1);
-    mbuf_append(&out, fragment->p, fragment->len);
-  }
-
-  result = 0;
-
-out:
-  if (result == 0) {
-    uri->p = out.buf;
-    uri->len = out.len;
-  } else {
-    mbuf_free(&out);
-    uri->p = NULL;
-    uri->len = 0;
-  }
-  return result;
-}
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_http.c"
-#endif
-
-#if MG_ENABLE_HTTP
-
-/* Amalgamated: #include "common/cs_md5.h" */
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_util.h" */
-
-/* altbuf {{{ */
-
-/*
- * Alternate buffer: fills the client-provided buffer with data; and if it's
- * not large enough, allocates another buffer (via mbuf), similar to asprintf.
- */
-struct altbuf {
-  struct mbuf m;
-  char *user_buf;
-  size_t len;
-  size_t user_buf_size;
-};
-
-/*
- * Initializes altbuf; `buf`, `buf_size` is the client-provided buffer.
- */
-MG_INTERNAL void altbuf_init(struct altbuf *ab, char *buf, size_t buf_size) {
-  mbuf_init(&ab->m, 0);
-  ab->user_buf = buf;
-  ab->user_buf_size = buf_size;
-  ab->len = 0;
-}
-
-/*
- * Appends a single char to the altbuf.
- */
-MG_INTERNAL void altbuf_append(struct altbuf *ab, char c) {
-  if (ab->len < ab->user_buf_size) {
-    /* The data fits into the original buffer */
-    ab->user_buf[ab->len++] = c;
-  } else {
-    /* The data can't fit into the original buffer, so write it to mbuf.  */
-
-    /*
-     * First of all, see if that's the first byte which overflows the original
-     * buffer: if so, copy the existing data from there to a newly allocated
-     * mbuf.
-     */
-    if (ab->len > 0 && ab->m.len == 0) {
-      mbuf_append(&ab->m, ab->user_buf, ab->len);
-    }
-
-    mbuf_append(&ab->m, &c, 1);
-    ab->len = ab->m.len;
-  }
-}
-
-/*
- * Resets any data previously appended to altbuf.
- */
-MG_INTERNAL void altbuf_reset(struct altbuf *ab) {
-  mbuf_free(&ab->m);
-  ab->len = 0;
-}
-
-/*
- * Returns whether the additional buffer was allocated (and thus the data
- * is in the mbuf, not the client-provided buffer)
- */
-MG_INTERNAL int altbuf_reallocated(struct altbuf *ab) {
-  return ab->len > ab->user_buf_size;
-}
-
-/*
- * Returns the actual buffer with data, either the client-provided or a newly
- * allocated one. If `trim` is non-zero, mbuf-backed buffer is trimmed first.
- */
-MG_INTERNAL char *altbuf_get_buf(struct altbuf *ab, int trim) {
-  if (altbuf_reallocated(ab)) {
-    if (trim) {
-      mbuf_trim(&ab->m);
-    }
-    return ab->m.buf;
-  } else {
-    return ab->user_buf;
-  }
-}
-
-/* }}} */
-
-static const char *mg_version_header = "Mongoose/" MG_VERSION;
-
-enum mg_http_proto_data_type { DATA_NONE, DATA_FILE, DATA_PUT };
-
-struct mg_http_proto_data_file {
-  FILE *fp;      /* Opened file. */
-  int64_t cl;    /* Content-Length. How many bytes to send. */
-  int64_t sent;  /* How many bytes have been already sent. */
-  int keepalive; /* Keep connection open after sending. */
-  enum mg_http_proto_data_type type;
-};
-
-#if MG_ENABLE_HTTP_CGI
-struct mg_http_proto_data_cgi {
-  struct mg_connection *cgi_nc;
-};
-#endif
-
-struct mg_http_proto_data_chuncked {
-  int64_t body_len; /* How many bytes of chunked body was reassembled. */
-};
-
-struct mg_http_endpoint {
-  struct mg_http_endpoint *next;
-  struct mg_str uri_pattern; /* owned */
-  char *auth_domain;         /* owned */
-  char *auth_file;           /* owned */
-
-  mg_event_handler_t handler;
-#if MG_ENABLE_CALLBACK_USERDATA
-  void *user_data;
-#endif
-};
-
-enum mg_http_multipart_stream_state {
-  MPS_BEGIN,
-  MPS_WAITING_FOR_BOUNDARY,
-  MPS_WAITING_FOR_CHUNK,
-  MPS_GOT_BOUNDARY,
-  MPS_FINALIZE,
-  MPS_FINISHED
-};
-
-struct mg_http_multipart_stream {
-  const char *boundary;
-  int boundary_len;
-  const char *var_name;
-  const char *file_name;
-  void *user_data;
-  enum mg_http_multipart_stream_state state;
-  int processing_part;
-  int data_avail;
-};
-
-struct mg_reverse_proxy_data {
-  struct mg_connection *linked_conn;
-};
-
-struct mg_ws_proto_data {
-  /*
-   * Defragmented size of the frame so far.
-   *
-   * First byte of nc->recv_mbuf.buf is an op, the rest of the data is
-   * defragmented data.
-   */
-  size_t reass_len;
-};
-
-struct mg_http_proto_data {
-#if MG_ENABLE_FILESYSTEM
-  struct mg_http_proto_data_file file;
-#endif
-#if MG_ENABLE_HTTP_CGI
-  struct mg_http_proto_data_cgi cgi;
-#endif
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-  struct mg_http_multipart_stream mp_stream;
-#endif
-#if MG_ENABLE_HTTP_WEBSOCKET
-  struct mg_ws_proto_data ws_data;
-#endif
-  struct mg_http_proto_data_chuncked chunk;
-  struct mg_http_endpoint *endpoints;
-  mg_event_handler_t endpoint_handler;
-  struct mg_reverse_proxy_data reverse_proxy_data;
-  size_t rcvd; /* How many bytes we have received. */
-};
-
-static void mg_http_proto_data_destructor(void *proto_data);
-
-struct mg_connection *mg_connect_http_base(
-    struct mg_mgr *mgr, MG_CB(mg_event_handler_t ev_handler, void *user_data),
-    struct mg_connect_opts opts, const char *scheme1, const char *scheme2,
-    const char *scheme_ssl1, const char *scheme_ssl2, const char *url,
-    struct mg_str *path, struct mg_str *user_info, struct mg_str *host);
-
-MG_INTERNAL struct mg_http_proto_data *mg_http_create_proto_data(
-    struct mg_connection *c) {
-  /* If we have proto data from previous connection, flush it. */
-  if (c->proto_data != NULL) {
-    void *pd = c->proto_data;
-    c->proto_data = NULL;
-    mg_http_proto_data_destructor(pd);
-  }
-  c->proto_data = MG_CALLOC(1, sizeof(struct mg_http_proto_data));
-  c->proto_data_destructor = mg_http_proto_data_destructor;
-  return (struct mg_http_proto_data *) c->proto_data;
-}
-
-static struct mg_http_proto_data *mg_http_get_proto_data(
-    struct mg_connection *c) {
-  return (struct mg_http_proto_data *) c->proto_data;
-}
-
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-static void mg_http_free_proto_data_mp_stream(
-    struct mg_http_multipart_stream *mp) {
-  MG_FREE((void *) mp->boundary);
-  MG_FREE((void *) mp->var_name);
-  MG_FREE((void *) mp->file_name);
-  memset(mp, 0, sizeof(*mp));
-}
-#endif
-
-#if MG_ENABLE_FILESYSTEM
-static void mg_http_free_proto_data_file(struct mg_http_proto_data_file *d) {
-  if (d != NULL) {
-    if (d->fp != NULL) {
-      fclose(d->fp);
-    }
-    memset(d, 0, sizeof(struct mg_http_proto_data_file));
-  }
-}
-#endif
-
-static void mg_http_free_proto_data_endpoints(struct mg_http_endpoint **ep) {
-  struct mg_http_endpoint *current = *ep;
-
-  while (current != NULL) {
-    struct mg_http_endpoint *tmp = current->next;
-    MG_FREE((void *) current->uri_pattern.p);
-    MG_FREE((void *) current->auth_domain);
-    MG_FREE((void *) current->auth_file);
-    MG_FREE(current);
-    current = tmp;
-  }
-
-  *ep = NULL;
-}
-
-static void mg_http_free_reverse_proxy_data(struct mg_reverse_proxy_data *rpd) {
-  if (rpd->linked_conn != NULL) {
-    /*
-     * Connection has linked one, we have to unlink & close it
-     * since _this_ connection is going to die and
-     * it doesn't make sense to keep another one
-     */
-    struct mg_http_proto_data *pd = mg_http_get_proto_data(rpd->linked_conn);
-    if (pd->reverse_proxy_data.linked_conn != NULL) {
-      pd->reverse_proxy_data.linked_conn->flags |= MG_F_SEND_AND_CLOSE;
-      pd->reverse_proxy_data.linked_conn = NULL;
-    }
-    rpd->linked_conn = NULL;
-  }
-}
-
-static void mg_http_proto_data_destructor(void *proto_data) {
-  struct mg_http_proto_data *pd = (struct mg_http_proto_data *) proto_data;
-#if MG_ENABLE_FILESYSTEM
-  mg_http_free_proto_data_file(&pd->file);
-#endif
-#if MG_ENABLE_HTTP_CGI
-  mg_http_free_proto_data_cgi(&pd->cgi);
-#endif
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-  mg_http_free_proto_data_mp_stream(&pd->mp_stream);
-#endif
-  mg_http_free_proto_data_endpoints(&pd->endpoints);
-  mg_http_free_reverse_proxy_data(&pd->reverse_proxy_data);
-  MG_FREE(proto_data);
-}
-
-#if MG_ENABLE_FILESYSTEM
-
-#define MIME_ENTRY(_ext, _type) \
-  { _ext, sizeof(_ext) - 1, _type }
-static const struct {
-  const char *extension;
-  size_t ext_len;
-  const char *mime_type;
-} mg_static_builtin_mime_types[] = {
-    MIME_ENTRY("html", "text/html"),
-    MIME_ENTRY("html", "text/html"),
-    MIME_ENTRY("htm", "text/html"),
-    MIME_ENTRY("shtm", "text/html"),
-    MIME_ENTRY("shtml", "text/html"),
-    MIME_ENTRY("css", "text/css"),
-    MIME_ENTRY("js", "application/x-javascript"),
-    MIME_ENTRY("ico", "image/x-icon"),
-    MIME_ENTRY("gif", "image/gif"),
-    MIME_ENTRY("jpg", "image/jpeg"),
-    MIME_ENTRY("jpeg", "image/jpeg"),
-    MIME_ENTRY("png", "image/png"),
-    MIME_ENTRY("svg", "image/svg+xml"),
-    MIME_ENTRY("txt", "text/plain"),
-    MIME_ENTRY("torrent", "application/x-bittorrent"),
-    MIME_ENTRY("wav", "audio/x-wav"),
-    MIME_ENTRY("mp3", "audio/x-mp3"),
-    MIME_ENTRY("mid", "audio/mid"),
-    MIME_ENTRY("m3u", "audio/x-mpegurl"),
-    MIME_ENTRY("ogg", "application/ogg"),
-    MIME_ENTRY("ram", "audio/x-pn-realaudio"),
-    MIME_ENTRY("xml", "text/xml"),
-    MIME_ENTRY("ttf", "application/x-font-ttf"),
-    MIME_ENTRY("json", "application/json"),
-    MIME_ENTRY("xslt", "application/xml"),
-    MIME_ENTRY("xsl", "application/xml"),
-    MIME_ENTRY("ra", "audio/x-pn-realaudio"),
-    MIME_ENTRY("doc", "application/msword"),
-    MIME_ENTRY("exe", "application/octet-stream"),
-    MIME_ENTRY("zip", "application/x-zip-compressed"),
-    MIME_ENTRY("xls", "application/excel"),
-    MIME_ENTRY("tgz", "application/x-tar-gz"),
-    MIME_ENTRY("tar", "application/x-tar"),
-    MIME_ENTRY("gz", "application/x-gunzip"),
-    MIME_ENTRY("arj", "application/x-arj-compressed"),
-    MIME_ENTRY("rar", "application/x-rar-compressed"),
-    MIME_ENTRY("rtf", "application/rtf"),
-    MIME_ENTRY("pdf", "application/pdf"),
-    MIME_ENTRY("swf", "application/x-shockwave-flash"),
-    MIME_ENTRY("mpg", "video/mpeg"),
-    MIME_ENTRY("webm", "video/webm"),
-    MIME_ENTRY("mpeg", "video/mpeg"),
-    MIME_ENTRY("mov", "video/quicktime"),
-    MIME_ENTRY("mp4", "video/mp4"),
-    MIME_ENTRY("m4v", "video/x-m4v"),
-    MIME_ENTRY("asf", "video/x-ms-asf"),
-    MIME_ENTRY("avi", "video/x-msvideo"),
-    MIME_ENTRY("bmp", "image/bmp"),
-    {NULL, 0, NULL},
-};
-
-static struct mg_str mg_get_mime_types_entry(struct mg_str path) {
-  size_t i;
-  for (i = 0; mg_static_builtin_mime_types[i].extension != NULL; i++) {
-    if (path.len < mg_static_builtin_mime_types[i].ext_len + 1) continue;
-    struct mg_str ext = MG_MK_STR_N(mg_static_builtin_mime_types[i].extension,
-                                    mg_static_builtin_mime_types[i].ext_len);
-    struct mg_str pext = MG_MK_STR_N(path.p + (path.len - ext.len), ext.len);
-    if (pext.p[-1] == '.' && mg_strcasecmp(ext, pext) == 0) {
-      return mg_mk_str(mg_static_builtin_mime_types[i].mime_type);
-    }
-  }
-  return mg_mk_str(NULL);
-}
-
-MG_INTERNAL int mg_get_mime_type_encoding(
-    struct mg_str path, struct mg_str *type, struct mg_str *encoding,
-    const struct mg_serve_http_opts *opts) {
-  const char *ext, *overrides;
-  struct mg_str k, v;
-
-  overrides = opts->custom_mime_types;
-  while ((overrides = mg_next_comma_list_entry(overrides, &k, &v)) != NULL) {
-    ext = path.p + (path.len - k.len);
-    if (path.len > k.len && mg_vcasecmp(&k, ext) == 0) {
-      *type = v;
-      return 1;
-    }
-  }
-
-  *type = mg_get_mime_types_entry(path);
-
-  /* Check for .html.gz, .js.gz, etc. */
-  if (mg_vcmp(type, "application/x-gunzip") == 0) {
-    struct mg_str path2 = mg_mk_str_n(path.p, path.len - 3);
-    struct mg_str type2 = mg_get_mime_types_entry(path2);
-    LOG(LL_ERROR, ("'%.*s' '%.*s' '%.*s'", (int) path.len, path.p,
-                   (int) path2.len, path2.p, (int) type2.len, type2.p));
-    if (type2.len > 0) {
-      *type = type2;
-      *encoding = mg_mk_str("gzip");
-    }
-  }
-
-  return (type->len > 0);
-}
-#endif
-
-/*
- * Check whether full request is buffered. Return:
- *   -1  if request is malformed
- *    0  if request is not yet fully buffered
- *   >0  actual request length, including last \r\n\r\n
- */
-static int mg_http_get_request_len(const char *s, int buf_len) {
-  const unsigned char *buf = (unsigned char *) s;
-  int i;
-
-  for (i = 0; i < buf_len; i++) {
-    if (!isprint(buf[i]) && buf[i] != '\r' && buf[i] != '\n' && buf[i] < 128) {
-      return -1;
-    } else if (buf[i] == '\n' && i + 1 < buf_len && buf[i + 1] == '\n') {
-      return i + 2;
-    } else if (buf[i] == '\n' && i + 2 < buf_len && buf[i + 1] == '\r' &&
-               buf[i + 2] == '\n') {
-      return i + 3;
-    }
-  }
-
-  return 0;
-}
-
-static const char *mg_http_parse_headers(const char *s, const char *end,
-                                         int len, struct http_message *req) {
-  int i = 0;
-  while (i < (int) ARRAY_SIZE(req->header_names) - 1) {
-    struct mg_str *k = &req->header_names[i], *v = &req->header_values[i];
-
-    s = mg_skip(s, end, ": ", k);
-    s = mg_skip(s, end, "\r\n", v);
-
-    while (v->len > 0 && v->p[v->len - 1] == ' ') {
-      v->len--; /* Trim trailing spaces in header value */
-    }
-
-    /*
-     * If header value is empty - skip it and go to next (if any).
-     * NOTE: Do not add it to headers_values because such addition changes API
-     * behaviour
-     */
-    if (k->len != 0 && v->len == 0) {
-      continue;
-    }
-
-    if (k->len == 0 || v->len == 0) {
-      k->p = v->p = NULL;
-      k->len = v->len = 0;
-      break;
-    }
-
-    if (!mg_ncasecmp(k->p, "Content-Length", 14)) {
-      req->body.len = (size_t) to64(v->p);
-      req->message.len = len + req->body.len;
-    }
-
-    i++;
-  }
-
-  return s;
-}
-
-int mg_parse_http(const char *s, int n, struct http_message *hm, int is_req) {
-  const char *end, *qs;
-  int len = mg_http_get_request_len(s, n);
-
-  if (len <= 0) return len;
-
-  memset(hm, 0, sizeof(*hm));
-  hm->message.p = s;
-  hm->body.p = s + len;
-  hm->message.len = hm->body.len = (size_t) ~0;
-  end = s + len;
-
-  /* Request is fully buffered. Skip leading whitespaces. */
-  while (s < end && isspace(*(unsigned char *) s)) s++;
-
-  if (is_req) {
-    /* Parse request line: method, URI, proto */
-    s = mg_skip(s, end, " ", &hm->method);
-    s = mg_skip(s, end, " ", &hm->uri);
-    s = mg_skip(s, end, "\r\n", &hm->proto);
-    if (hm->uri.p <= hm->method.p || hm->proto.p <= hm->uri.p) return -1;
-
-    /* If URI contains '?' character, initialize query_string */
-    if ((qs = (char *) memchr(hm->uri.p, '?', hm->uri.len)) != NULL) {
-      hm->query_string.p = qs + 1;
-      hm->query_string.len = &hm->uri.p[hm->uri.len] - (qs + 1);
-      hm->uri.len = qs - hm->uri.p;
-    }
-  } else {
-    s = mg_skip(s, end, " ", &hm->proto);
-    if (end - s < 4 || s[0] < '0' || s[0] > '9' || s[3] != ' ') return -1;
-    hm->resp_code = atoi(s);
-    if (hm->resp_code < 100 || hm->resp_code >= 600) return -1;
-    s += 4;
-    s = mg_skip(s, end, "\r\n", &hm->resp_status_msg);
-  }
-
-  s = mg_http_parse_headers(s, end, len, hm);
-
-  /*
-   * mg_parse_http() is used to parse both HTTP requests and HTTP
-   * responses. If HTTP response does not have Content-Length set, then
-   * body is read until socket is closed, i.e. body.len is infinite (~0).
-   *
-   * For HTTP requests though, according to
-   * http://tools.ietf.org/html/rfc7231#section-8.1.3,
-   * only POST and PUT methods have defined body semantics.
-   * Therefore, if Content-Length is not specified and methods are
-   * not one of PUT or POST, set body length to 0.
-   *
-   * So,
-   * if it is HTTP request, and Content-Length is not set,
-   * and method is not (PUT or POST) then reset body length to zero.
-   */
-  if (hm->body.len == (size_t) ~0 && is_req &&
-      mg_vcasecmp(&hm->method, "PUT") != 0 &&
-      mg_vcasecmp(&hm->method, "POST") != 0) {
-    hm->body.len = 0;
-    hm->message.len = len;
-  }
-
-  return len;
-}
-
-struct mg_str *mg_get_http_header(struct http_message *hm, const char *name) {
-  size_t i, len = strlen(name);
-
-  for (i = 0; hm->header_names[i].len > 0; i++) {
-    struct mg_str *h = &hm->header_names[i], *v = &hm->header_values[i];
-    if (h->p != NULL && h->len == len && !mg_ncasecmp(h->p, name, len))
-      return v;
-  }
-
-  return NULL;
-}
-
-#if MG_ENABLE_FILESYSTEM
-static void mg_http_transfer_file_data(struct mg_connection *nc) {
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
-  char buf[MG_MAX_HTTP_SEND_MBUF];
-  size_t n = 0, to_read = 0, left = (size_t)(pd->file.cl - pd->file.sent);
-
-  if (pd->file.type == DATA_FILE) {
-    struct mbuf *io = &nc->send_mbuf;
-    if (io->len >= MG_MAX_HTTP_SEND_MBUF) {
-      to_read = 0;
-    } else {
-      to_read = MG_MAX_HTTP_SEND_MBUF - io->len;
-    }
-    if (to_read > left) {
-      to_read = left;
-    }
-    if (to_read > 0) {
-      n = mg_fread(buf, 1, to_read, pd->file.fp);
-      if (n > 0) {
-        mg_send(nc, buf, n);
-        pd->file.sent += n;
-        DBG(("%p sent %d (total %d)", nc, (int) n, (int) pd->file.sent));
-      }
-    } else {
-      /* Rate-limited */
-    }
-    if (pd->file.sent >= pd->file.cl) {
-      LOG(LL_DEBUG, ("%p done, %d bytes, ka %d", nc, (int) pd->file.sent,
-                     pd->file.keepalive));
-      if (!pd->file.keepalive) nc->flags |= MG_F_SEND_AND_CLOSE;
-      mg_http_free_proto_data_file(&pd->file);
-    }
-  } else if (pd->file.type == DATA_PUT) {
-    struct mbuf *io = &nc->recv_mbuf;
-    size_t to_write = left <= 0 ? 0 : left < io->len ? (size_t) left : io->len;
-    size_t n1 = mg_fwrite(io->buf, 1, to_write, pd->file.fp);
-    if (n1 > 0) {
-      mbuf_remove(io, n1);
-      pd->file.sent += n1;
-    }
-    if (n1 == 0 || pd->file.sent >= pd->file.cl) {
-      if (!pd->file.keepalive) nc->flags |= MG_F_SEND_AND_CLOSE;
-      mg_http_free_proto_data_file(&pd->file);
-    }
-  }
-#if MG_ENABLE_HTTP_CGI
-  else if (pd->cgi.cgi_nc != NULL) {
-    /* This is POST data that needs to be forwarded to the CGI process */
-    if (pd->cgi.cgi_nc != NULL) {
-      mg_forward(nc, pd->cgi.cgi_nc);
-    } else {
-      nc->flags |= MG_F_SEND_AND_CLOSE;
-    }
-  }
-#endif
-}
-#endif /* MG_ENABLE_FILESYSTEM */
-
-/*
- * Parse chunked-encoded buffer. Return 0 if the buffer is not encoded, or
- * if it's incomplete. If the chunk is fully buffered, return total number of
- * bytes in a chunk, and store data in `data`, `data_len`.
- */
-static size_t mg_http_parse_chunk(char *buf, size_t len, char **chunk_data,
-                                  size_t *chunk_len) {
-  unsigned char *s = (unsigned char *) buf;
-  size_t n = 0; /* scanned chunk length */
-  size_t i = 0; /* index in s */
-
-  /* Scan chunk length. That should be a hexadecimal number. */
-  while (i < len && isxdigit(s[i])) {
-    n *= 16;
-    n += (s[i] >= '0' && s[i] <= '9') ? s[i] - '0' : tolower(s[i]) - 'a' + 10;
-    i++;
-    if (i > 6) {
-      /* Chunk size is unreasonable. */
-      return 0;
-    }
-  }
-
-  /* Skip new line */
-  if (i == 0 || i + 2 > len || s[i] != '\r' || s[i + 1] != '\n') {
-    return 0;
-  }
-  i += 2;
-
-  /* Record where the data is */
-  *chunk_data = (char *) s + i;
-  *chunk_len = n;
-
-  /* Skip data */
-  i += n;
-
-  /* Skip new line */
-  if (i == 0 || i + 2 > len || s[i] != '\r' || s[i + 1] != '\n') {
-    return 0;
-  }
-  return i + 2;
-}
-
-MG_INTERNAL size_t mg_handle_chunked(struct mg_connection *nc,
-                                     struct http_message *hm, char *buf,
-                                     size_t blen) {
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
-  char *data;
-  size_t i, n, data_len, body_len, zero_chunk_received = 0;
-  /* Find out piece of received data that is not yet reassembled */
-  body_len = (size_t) pd->chunk.body_len;
-  assert(blen >= body_len);
-
-  /* Traverse all fully buffered chunks */
-  for (i = body_len;
-       (n = mg_http_parse_chunk(buf + i, blen - i, &data, &data_len)) > 0;
-       i += n) {
-    /* Collapse chunk data to the rest of HTTP body */
-    memmove(buf + body_len, data, data_len);
-    body_len += data_len;
-    hm->body.len = body_len;
-
-    if (data_len == 0) {
-      zero_chunk_received = 1;
-      i += n;
-      break;
-    }
-  }
-
-  if (i > body_len) {
-    /* Shift unparsed content to the parsed body */
-    assert(i <= blen);
-    memmove(buf + body_len, buf + i, blen - i);
-    memset(buf + body_len + blen - i, 0, i - body_len);
-    nc->recv_mbuf.len -= i - body_len;
-    pd->chunk.body_len = body_len;
-
-    /* Send MG_EV_HTTP_CHUNK event */
-    nc->flags &= ~MG_F_DELETE_CHUNK;
-    mg_call(nc, nc->handler, nc->user_data, MG_EV_HTTP_CHUNK, hm);
-
-    /* Delete processed data if user set MG_F_DELETE_CHUNK flag */
-    if (nc->flags & MG_F_DELETE_CHUNK) {
-      memset(buf, 0, body_len);
-      memmove(buf, buf + body_len, blen - i);
-      nc->recv_mbuf.len -= body_len;
-      hm->body.len = 0;
-      pd->chunk.body_len = 0;
-    }
-
-    if (zero_chunk_received) {
-      /* Total message size is len(body) + len(headers) */
-      hm->message.len =
-          (size_t) pd->chunk.body_len + blen - i + (hm->body.p - hm->message.p);
-    }
-  }
-
-  return body_len;
-}
-
-static struct mg_http_endpoint *mg_http_get_endpoint_handler(struct mg_connection *nc,
-                                                      struct mg_str *uri_path) {
-  struct mg_http_proto_data *pd;
-  struct mg_http_endpoint *ret = NULL;
-  int matched, matched_max = 0;
-  struct mg_http_endpoint *ep;
-
-  if (nc == NULL) return NULL;
-
-  pd = mg_http_get_proto_data(nc);
-
-  if (pd == NULL) return NULL;
-
-  ep = pd->endpoints;
-  while (ep != NULL) {
-    if ((matched = mg_match_prefix_n(ep->uri_pattern, *uri_path)) > 0) {
-      if (matched > matched_max) {
-        /* Looking for the longest suitable handler */
-        ret = ep;
-        matched_max = matched;
-      }
-    }
-
-    ep = ep->next;
-  }
-
-  return ret;
-}
-
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-static void mg_http_multipart_continue(struct mg_connection *nc);
-
-static void mg_http_multipart_begin(struct mg_connection *nc,
-                                    struct http_message *hm, int req_len);
-
-#endif
-
-static void mg_http_call_endpoint_handler(struct mg_connection *nc, int ev,
-                                          struct http_message *hm);
-
-static void deliver_chunk(struct mg_connection *c, struct http_message *hm,
-                          int req_len) {
-  /* Incomplete message received. Send MG_EV_HTTP_CHUNK event */
-  hm->body.len = c->recv_mbuf.len - req_len;
-  c->flags &= ~MG_F_DELETE_CHUNK;
-  mg_call(c, c->handler, c->user_data, MG_EV_HTTP_CHUNK, hm);
-  /* Delete processed data if user set MG_F_DELETE_CHUNK flag */
-  if (c->flags & MG_F_DELETE_CHUNK) c->recv_mbuf.len = req_len;
-}
-
-/*
- * lx106 compiler has a bug (TODO(mkm) report and insert tracking bug here)
- * If a big structure is declared in a big function, lx106 gcc will make it
- * even bigger (round up to 4k, from 700 bytes of actual size).
- */
-#ifdef __xtensa__
-static void mg_http_handler2(struct mg_connection *nc, int ev,
-                             void *ev_data MG_UD_ARG(void *user_data),
-                             struct http_message *hm) __attribute__((noinline));
-
-void mg_http_handler(struct mg_connection *nc, int ev,
-                     void *ev_data MG_UD_ARG(void *user_data)) {
-  struct http_message hm;
-  mg_http_handler2(nc, ev, ev_data MG_UD_ARG(user_data), &hm);
-}
-
-static void mg_http_handler2(struct mg_connection *nc, int ev,
-                             void *ev_data MG_UD_ARG(void *user_data),
-                             struct http_message *hm) {
-#else  /* !__XTENSA__ */
-static void mg_http_handler(struct mg_connection *nc, int ev,
-                     void *ev_data MG_UD_ARG(void *user_data)) {
-  struct http_message shm, *hm = &shm;
-#endif /* __XTENSA__ */
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
-  struct mbuf *io = &nc->recv_mbuf;
-  int req_len;
-  const int is_req = (nc->listener != NULL);
-#if MG_ENABLE_HTTP_WEBSOCKET
-  struct mg_str *vec;
-#endif
-  if (ev == MG_EV_CLOSE) {
-#if MG_ENABLE_HTTP_CGI
-    /* Close associated CGI forwarder connection */
-    if (pd != NULL && pd->cgi.cgi_nc != NULL) {
-      pd->cgi.cgi_nc->user_data = NULL;
-      pd->cgi.cgi_nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-    }
-#endif
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-    if (pd != NULL && pd->mp_stream.boundary != NULL) {
-      /*
-       * Multipart message is in progress, but connection is closed.
-       * Finish part and request with an error flag.
-       */
-      struct mg_http_multipart_part mp;
-      memset(&mp, 0, sizeof(mp));
-      mp.status = -1;
-      mp.user_data = pd->mp_stream.user_data;
-      mp.var_name = pd->mp_stream.var_name;
-      mp.file_name = pd->mp_stream.file_name;
-      mg_call(nc, (pd->endpoint_handler ? pd->endpoint_handler : nc->handler),
-              nc->user_data, MG_EV_HTTP_PART_END, &mp);
-      mp.var_name = NULL;
-      mp.file_name = NULL;
-      mg_call(nc, (pd->endpoint_handler ? pd->endpoint_handler : nc->handler),
-              nc->user_data, MG_EV_HTTP_MULTIPART_REQUEST_END, &mp);
-    } else
-#endif
-        if (io->len > 0 &&
-            (req_len = mg_parse_http(io->buf, io->len, hm, is_req)) > 0) {
-      /*
-       * For HTTP messages without Content-Length, always send HTTP message
-       * before MG_EV_CLOSE message.
-       */
-      int ev2 = is_req ? MG_EV_HTTP_REQUEST : MG_EV_HTTP_REPLY;
-      hm->message.len = io->len;
-      hm->body.len = io->buf + io->len - hm->body.p;
-      deliver_chunk(nc, hm, req_len);
-      mg_http_call_endpoint_handler(nc, ev2, hm);
-    }
-    if (pd != NULL && pd->endpoint_handler != NULL &&
-        pd->endpoint_handler != nc->handler) {
-      mg_call(nc, pd->endpoint_handler, nc->user_data, ev, NULL);
-    }
-  }
-
-#if MG_ENABLE_FILESYSTEM
-  if (pd != NULL && pd->file.fp != NULL) {
-    mg_http_transfer_file_data(nc);
-  }
-#endif
-
-  mg_call(nc, nc->handler, nc->user_data, ev, ev_data);
-
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-  if (pd != NULL && pd->mp_stream.boundary != NULL &&
-      (ev == MG_EV_RECV || ev == MG_EV_POLL)) {
-    if (ev == MG_EV_RECV) {
-      pd->rcvd += *(int *) ev_data;
-      mg_http_multipart_continue(nc);
-    } else if (pd->mp_stream.data_avail) {
-      /* Try re-delivering the data. */
-      mg_http_multipart_continue(nc);
-    }
-    return;
-  }
-#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
-
-  if (ev == MG_EV_RECV) {
-    struct mg_str *s;
-
-  again:
-    req_len = mg_parse_http(io->buf, io->len, hm, is_req);
-
-    if (req_len > 0) {
-      /* New request - new proto data */
-      pd = mg_http_create_proto_data(nc);
-      pd->rcvd = io->len;
-    }
-
-    if (req_len > 0 &&
-        (s = mg_get_http_header(hm, "Transfer-Encoding")) != NULL &&
-        mg_vcasecmp(s, "chunked") == 0) {
-      mg_handle_chunked(nc, hm, io->buf + req_len, io->len - req_len);
-    }
-
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-    if (req_len > 0 && (s = mg_get_http_header(hm, "Content-Type")) != NULL &&
-        s->len >= 9 && strncmp(s->p, "multipart", 9) == 0) {
-      mg_http_multipart_begin(nc, hm, req_len);
-      mg_http_multipart_continue(nc);
-      return;
-    }
-#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
-
-    /* TODO(alashkin): refactor this ifelseifelseifelseifelse */
-    if ((req_len < 0 ||
-         (req_len == 0 && io->len >= MG_MAX_HTTP_REQUEST_SIZE))) {
-      DBG(("invalid request"));
-      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-    } else if (req_len == 0) {
-      /* Do nothing, request is not yet fully buffered */
-    }
-#if MG_ENABLE_HTTP_WEBSOCKET
-    else if (nc->listener == NULL && (nc->flags & MG_F_IS_WEBSOCKET)) {
-      /* We're websocket client, got handshake response from server. */
-      DBG(("%p WebSocket upgrade code %d", nc, hm->resp_code));
-      if (hm->resp_code == 101 &&
-          mg_get_http_header(hm, "Sec-WebSocket-Accept")) {
-        /* TODO(lsm): check the validity of accept Sec-WebSocket-Accept */
-        mg_call(nc, nc->handler, nc->user_data, MG_EV_WEBSOCKET_HANDSHAKE_DONE,
-                hm);
-        mbuf_remove(io, req_len);
-        nc->proto_handler = mg_ws_handler;
-        mg_ws_handler(nc, MG_EV_RECV, ev_data MG_UD_ARG(user_data));
-      } else {
-        mg_call(nc, nc->handler, nc->user_data, MG_EV_WEBSOCKET_HANDSHAKE_DONE,
-                hm);
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-        mbuf_remove(io, req_len);
-      }
-    } else if (nc->listener != NULL &&
-               (vec = mg_get_http_header(hm, "Sec-WebSocket-Key")) != NULL) {
-      struct mg_http_endpoint *ep;
-
-      /* This is a websocket request. Switch protocol handlers. */
-      mbuf_remove(io, req_len);
-      nc->proto_handler = mg_ws_handler;
-      nc->flags |= MG_F_IS_WEBSOCKET;
-
-      /*
-       * If we have a handler set up with mg_register_http_endpoint(),
-       * deliver subsequent websocket events to this handler after the
-       * protocol switch.
-       */
-      ep = mg_http_get_endpoint_handler(nc->listener, &hm->uri);
-      if (ep != NULL) {
-        nc->handler = ep->handler;
-#if MG_ENABLE_CALLBACK_USERDATA
-        nc->user_data = ep->user_data;
-#endif
-      }
-
-      /* Send handshake */
-      mg_call(nc, nc->handler, nc->user_data, MG_EV_WEBSOCKET_HANDSHAKE_REQUEST,
-              hm);
-      if (!(nc->flags & (MG_F_CLOSE_IMMEDIATELY | MG_F_SEND_AND_CLOSE))) {
-        if (nc->send_mbuf.len == 0) {
-          mg_ws_handshake(nc, vec, hm);
-        }
-        mg_call(nc, nc->handler, nc->user_data, MG_EV_WEBSOCKET_HANDSHAKE_DONE,
-                hm);
-        mg_ws_handler(nc, MG_EV_RECV, ev_data MG_UD_ARG(user_data));
-      }
-    }
-#endif /* MG_ENABLE_HTTP_WEBSOCKET */
-    else if (hm->message.len > pd->rcvd) {
-      /* Not yet received all HTTP body, deliver MG_EV_HTTP_CHUNK */
-      deliver_chunk(nc, hm, req_len);
-      if (nc->recv_mbuf_limit > 0 && nc->recv_mbuf.len >= nc->recv_mbuf_limit) {
-        LOG(LL_ERROR, ("%p recv buffer (%lu bytes) exceeds the limit "
-                       "%lu bytes, and not drained, closing",
-                       nc, (unsigned long) nc->recv_mbuf.len,
-                       (unsigned long) nc->recv_mbuf_limit));
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      }
-    } else {
-      /* We did receive all HTTP body. */
-      int request_done = 1;
-      int trigger_ev = nc->listener ? MG_EV_HTTP_REQUEST : MG_EV_HTTP_REPLY;
-      char addr[32];
-      mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr),
-                          MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
-      DBG(("%p %s %.*s %.*s", nc, addr, (int) hm->method.len, hm->method.p,
-           (int) hm->uri.len, hm->uri.p));
-      deliver_chunk(nc, hm, req_len);
-      /* Whole HTTP message is fully buffered, call event handler */
-      mg_http_call_endpoint_handler(nc, trigger_ev, hm);
-      mbuf_remove(io, hm->message.len);
-      pd->rcvd -= hm->message.len;
-#if MG_ENABLE_FILESYSTEM
-      /* We don't have a generic mechanism of communicating that we are done
-       * responding to a request (should probably add one). But if we are
-       * serving
-       * a file, we are definitely not done. */
-      if (pd->file.fp != NULL) request_done = 0;
-#endif
-#if MG_ENABLE_HTTP_CGI
-      /* If this is a CGI request, we are not done either. */
-      if (pd->cgi.cgi_nc != NULL) request_done = 0;
-#endif
-      if (request_done && io->len > 0) goto again;
-    }
-  }
-}
-
-static size_t mg_get_line_len(const char *buf, size_t buf_len) {
-  size_t len = 0;
-  while (len < buf_len && buf[len] != '\n') len++;
-  return len == buf_len ? 0 : len + 1;
-}
-
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-static void mg_http_multipart_begin(struct mg_connection *nc,
-                                    struct http_message *hm, int req_len) {
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
-  struct mg_str *ct;
-  struct mbuf *io = &nc->recv_mbuf;
-
-  char boundary_buf[100];
-  char *boundary = boundary_buf;
-  int boundary_len;
-
-  ct = mg_get_http_header(hm, "Content-Type");
-  if (ct == NULL) {
-    /* We need more data - or it isn't multipart mesage */
-    goto exit_mp;
-  }
-
-  /* Content-type should start with "multipart" */
-  if (ct->len < 9 || strncmp(ct->p, "multipart", 9) != 0) {
-    goto exit_mp;
-  }
-
-  boundary_len =
-      mg_http_parse_header2(ct, "boundary", &boundary, sizeof(boundary_buf));
-  if (boundary_len == 0) {
-    /*
-     * Content type is multipart, but there is no boundary,
-     * probably malformed request
-     */
-    nc->flags = MG_F_CLOSE_IMMEDIATELY;
-    DBG(("invalid request"));
-    goto exit_mp;
-  }
-
-  /* If we reach this place - that is multipart request */
-
-  if (pd->mp_stream.boundary != NULL) {
-    /*
-     * Another streaming request was in progress,
-     * looks like protocol error
-     */
-    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-  } else {
-    struct mg_http_endpoint *ep = NULL;
-    pd->mp_stream.state = MPS_BEGIN;
-    pd->mp_stream.boundary = strdup(boundary);
-    pd->mp_stream.boundary_len = strlen(boundary);
-    pd->mp_stream.var_name = pd->mp_stream.file_name = NULL;
-    pd->endpoint_handler = nc->handler;
-
-    ep = mg_http_get_endpoint_handler(nc->listener, &hm->uri);
-    if (ep != NULL) {
-      pd->endpoint_handler = ep->handler;
-    }
-
-    mg_http_call_endpoint_handler(nc, MG_EV_HTTP_MULTIPART_REQUEST, hm);
-
-    mbuf_remove(io, req_len);
-  }
-exit_mp:
-  if (boundary != boundary_buf) MG_FREE(boundary);
-}
-
-#define CONTENT_DISPOSITION "Content-Disposition: "
-
-static size_t mg_http_multipart_call_handler(struct mg_connection *c, int ev,
-                                             const char *data,
-                                             size_t data_len) {
-  struct mg_http_multipart_part mp;
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
-  memset(&mp, 0, sizeof(mp));
-
-  mp.var_name = pd->mp_stream.var_name;
-  mp.file_name = pd->mp_stream.file_name;
-  mp.user_data = pd->mp_stream.user_data;
-  mp.data.p = data;
-  mp.data.len = data_len;
-  mp.num_data_consumed = data_len;
-  mg_call(c, pd->endpoint_handler, c->user_data, ev, &mp);
-  pd->mp_stream.user_data = mp.user_data;
-  pd->mp_stream.data_avail = (mp.num_data_consumed != data_len);
-  return mp.num_data_consumed;
-}
-
-static int mg_http_multipart_finalize(struct mg_connection *c) {
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
-
-  mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_END, NULL, 0);
-  MG_FREE((void *) pd->mp_stream.file_name);
-  pd->mp_stream.file_name = NULL;
-  MG_FREE((void *) pd->mp_stream.var_name);
-  pd->mp_stream.var_name = NULL;
-  mg_http_multipart_call_handler(c, MG_EV_HTTP_MULTIPART_REQUEST_END, NULL, 0);
-  mg_http_free_proto_data_mp_stream(&pd->mp_stream);
-  pd->mp_stream.state = MPS_FINISHED;
-
-  return 1;
-}
-
-static int mg_http_multipart_wait_for_boundary(struct mg_connection *c) {
-  const char *boundary;
-  struct mbuf *io = &c->recv_mbuf;
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
-
-  if (pd->mp_stream.boundary == NULL) {
-    pd->mp_stream.state = MPS_FINALIZE;
-    DBG(("Invalid request: boundary not initialized"));
-    return 0;
-  }
-
-  if ((int) io->len < pd->mp_stream.boundary_len + 2) {
-    return 0;
-  }
-
-  boundary = c_strnstr(io->buf, pd->mp_stream.boundary, io->len);
-  if (boundary != NULL) {
-    const char *boundary_end = (boundary + pd->mp_stream.boundary_len);
-    if (io->len - (boundary_end - io->buf) < 4) {
-      return 0;
-    }
-    if (strncmp(boundary_end, "--\r\n", 4) == 0) {
-      pd->mp_stream.state = MPS_FINALIZE;
-      mbuf_remove(io, (boundary_end - io->buf) + 4);
-    } else {
-      pd->mp_stream.state = MPS_GOT_BOUNDARY;
-    }
-  } else {
-    return 0;
-  }
-
-  return 1;
-}
-
-static void mg_http_parse_header_internal(struct mg_str *hdr,
-                                          const char *var_name,
-                                          struct altbuf *ab);
-
-static int mg_http_multipart_process_boundary(struct mg_connection *c) {
-  int data_size;
-  const char *boundary, *block_begin;
-  struct mbuf *io = &c->recv_mbuf;
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
-  struct altbuf ab_file_name, ab_var_name;
-  int line_len;
-  boundary = c_strnstr(io->buf, pd->mp_stream.boundary, io->len);
-  block_begin = boundary + pd->mp_stream.boundary_len + 2;
-  data_size = io->len - (block_begin - io->buf);
-
-  altbuf_init(&ab_file_name, NULL, 0);
-  altbuf_init(&ab_var_name, NULL, 0);
-
-  while (data_size > 0 &&
-         (line_len = mg_get_line_len(block_begin, data_size)) != 0) {
-    if (line_len > (int) sizeof(CONTENT_DISPOSITION) &&
-        mg_ncasecmp(block_begin, CONTENT_DISPOSITION,
-                    sizeof(CONTENT_DISPOSITION) - 1) == 0) {
-      struct mg_str header;
-
-      header.p = block_begin + sizeof(CONTENT_DISPOSITION) - 1;
-      header.len = line_len - sizeof(CONTENT_DISPOSITION) - 1;
-
-      altbuf_reset(&ab_var_name);
-      mg_http_parse_header_internal(&header, "name", &ab_var_name);
-
-      altbuf_reset(&ab_file_name);
-      mg_http_parse_header_internal(&header, "filename", &ab_file_name);
-
-      block_begin += line_len;
-      data_size -= line_len;
-
-      continue;
-    }
-
-    if (line_len == 2 && mg_ncasecmp(block_begin, "\r\n", 2) == 0) {
-      mbuf_remove(io, block_begin - io->buf + 2);
-
-      if (pd->mp_stream.processing_part != 0) {
-        mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_END, NULL, 0);
-      }
-
-      /* Reserve 2 bytes for "\r\n" in file_name and var_name */
-      altbuf_append(&ab_file_name, '\0');
-      altbuf_append(&ab_file_name, '\0');
-      altbuf_append(&ab_var_name, '\0');
-      altbuf_append(&ab_var_name, '\0');
-
-      MG_FREE((void *) pd->mp_stream.file_name);
-      pd->mp_stream.file_name = altbuf_get_buf(&ab_file_name, 1 /* trim */);
-      MG_FREE((void *) pd->mp_stream.var_name);
-      pd->mp_stream.var_name = altbuf_get_buf(&ab_var_name, 1 /* trim */);
-
-      mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_BEGIN, NULL, 0);
-      pd->mp_stream.state = MPS_WAITING_FOR_CHUNK;
-      pd->mp_stream.processing_part++;
-      return 1;
-    }
-
-    block_begin += line_len;
-  }
-
-  pd->mp_stream.state = MPS_WAITING_FOR_BOUNDARY;
-
-  altbuf_reset(&ab_var_name);
-  altbuf_reset(&ab_file_name);
-
-  return 0;
-}
-
-static int mg_http_multipart_continue_wait_for_chunk(struct mg_connection *c) {
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
-  struct mbuf *io = &c->recv_mbuf;
-
-  const char *boundary;
-  if ((int) io->len < pd->mp_stream.boundary_len + 6 /* \r\n, --, -- */) {
-    return 0;
-  }
-
-  boundary = c_strnstr(io->buf, pd->mp_stream.boundary, io->len);
-  if (boundary == NULL) {
-    int data_len = (io->len - (pd->mp_stream.boundary_len + 6));
-    if (data_len > 0) {
-      size_t consumed = mg_http_multipart_call_handler(
-          c, MG_EV_HTTP_PART_DATA, io->buf, (size_t) data_len);
-      mbuf_remove(io, consumed);
-    }
-    return 0;
-  } else if (boundary != NULL) {
-    size_t data_len = ((size_t)(boundary - io->buf) - 4);
-    size_t consumed = mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_DATA,
-                                                     io->buf, data_len);
-    mbuf_remove(io, consumed);
-    if (consumed == data_len) {
-      mbuf_remove(io, 4);
-      pd->mp_stream.state = MPS_WAITING_FOR_BOUNDARY;
-      return 1;
-    } else {
-      return 0;
-    }
-  } else {
-    return 0;
-  }
-}
-
-static void mg_http_multipart_continue(struct mg_connection *c) {
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(c);
-  while (1) {
-    switch (pd->mp_stream.state) {
-      case MPS_BEGIN: {
-        pd->mp_stream.state = MPS_WAITING_FOR_BOUNDARY;
-        break;
-      }
-      case MPS_WAITING_FOR_BOUNDARY: {
-        if (mg_http_multipart_wait_for_boundary(c) == 0) {
-          return;
-        }
-        break;
-      }
-      case MPS_GOT_BOUNDARY: {
-        if (mg_http_multipart_process_boundary(c) == 0) {
-          return;
-        }
-        break;
-      }
-      case MPS_WAITING_FOR_CHUNK: {
-        if (mg_http_multipart_continue_wait_for_chunk(c) == 0) {
-          return;
-        }
-        break;
-      }
-      case MPS_FINALIZE: {
-        if (mg_http_multipart_finalize(c) == 0) {
-          return;
-        }
-        break;
-      }
-      case MPS_FINISHED: {
-        return;
-      }
-    }
-  }
-}
-
-struct file_upload_state {
-  char *lfn;
-  size_t num_recd;
-  FILE *fp;
-};
-
-#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
-
-void mg_set_protocol_http_websocket(struct mg_connection *nc) {
-  nc->proto_handler = mg_http_handler;
-}
-
-static const char *mg_status_message(int status_code) {
-  switch (status_code) {
-    case 206:
-      return "Partial Content";
-    case 301:
-      return "Moved";
-    case 302:
-      return "Found";
-    case 400:
-      return "Bad Request";
-    case 401:
-      return "Unauthorized";
-    case 403:
-      return "Forbidden";
-    case 404:
-      return "Not Found";
-    case 416:
-      return "Requested Range Not Satisfiable";
-    case 418:
-      return "I'm a teapot";
-    case 500:
-      return "Internal Server Error";
-    case 502:
-      return "Bad Gateway";
-    case 503:
-      return "Service Unavailable";
-
-#if MG_ENABLE_EXTRA_ERRORS_DESC
-    case 100:
-      return "Continue";
-    case 101:
-      return "Switching Protocols";
-    case 102:
-      return "Processing";
-    case 200:
-      return "OK";
-    case 201:
-      return "Created";
-    case 202:
-      return "Accepted";
-    case 203:
-      return "Non-Authoritative Information";
-    case 204:
-      return "No Content";
-    case 205:
-      return "Reset Content";
-    case 207:
-      return "Multi-Status";
-    case 208:
-      return "Already Reported";
-    case 226:
-      return "IM Used";
-    case 300:
-      return "Multiple Choices";
-    case 303:
-      return "See Other";
-    case 304:
-      return "Not Modified";
-    case 305:
-      return "Use Proxy";
-    case 306:
-      return "Switch Proxy";
-    case 307:
-      return "Temporary Redirect";
-    case 308:
-      return "Permanent Redirect";
-    case 402:
-      return "Payment Required";
-    case 405:
-      return "Method Not Allowed";
-    case 406:
-      return "Not Acceptable";
-    case 407:
-      return "Proxy Authentication Required";
-    case 408:
-      return "Request Timeout";
-    case 409:
-      return "Conflict";
-    case 410:
-      return "Gone";
-    case 411:
-      return "Length Required";
-    case 412:
-      return "Precondition Failed";
-    case 413:
-      return "Payload Too Large";
-    case 414:
-      return "URI Too Long";
-    case 415:
-      return "Unsupported Media Type";
-    case 417:
-      return "Expectation Failed";
-    case 422:
-      return "Unprocessable Entity";
-    case 423:
-      return "Locked";
-    case 424:
-      return "Failed Dependency";
-    case 426:
-      return "Upgrade Required";
-    case 428:
-      return "Precondition Required";
-    case 429:
-      return "Too Many Requests";
-    case 431:
-      return "Request Header Fields Too Large";
-    case 451:
-      return "Unavailable For Legal Reasons";
-    case 501:
-      return "Not Implemented";
-    case 504:
-      return "Gateway Timeout";
-    case 505:
-      return "HTTP Version Not Supported";
-    case 506:
-      return "Variant Also Negotiates";
-    case 507:
-      return "Insufficient Storage";
-    case 508:
-      return "Loop Detected";
-    case 510:
-      return "Not Extended";
-    case 511:
-      return "Network Authentication Required";
-#endif /* MG_ENABLE_EXTRA_ERRORS_DESC */
-
-    default:
-      return "OK";
-  }
-}
-
-static void mg_send_response_line_s(struct mg_connection *nc, int status_code,
-                             const struct mg_str extra_headers) {
-  mg_printf(nc, "HTTP/1.1 %d %s\r\n", status_code,
-            mg_status_message(status_code));
-#ifndef MG_HIDE_SERVER_INFO
-  mg_printf(nc, "Server: %s\r\n", mg_version_header);
-#endif
-  if (extra_headers.len > 0) {
-    mg_printf(nc, "%.*s\r\n", (int) extra_headers.len, extra_headers.p);
-  }
-}
-
-void mg_send_response_line(struct mg_connection *nc, int status_code,
-                           const char *extra_headers) {
-  mg_send_response_line_s(nc, status_code, mg_mk_str(extra_headers));
-}
-
-void mg_http_send_redirect(struct mg_connection *nc, int status_code,
-                           const struct mg_str location,
-                           const struct mg_str extra_headers) {
-  char bbody[100], *pbody = bbody;
-  int bl = mg_asprintf(&pbody, sizeof(bbody),
-                       "<p>Moved <a href='%.*s'>here</a>.\r\n",
-                       (int) location.len, location.p);
-  char bhead[150], *phead = bhead;
-  mg_asprintf(&phead, sizeof(bhead),
-              "Location: %.*s\r\n"
-              "Content-Type: text/html\r\n"
-              "Content-Length: %d\r\n"
-              "Cache-Control: no-cache\r\n"
-              "%.*s%s",
-              (int) location.len, location.p, bl, (int) extra_headers.len,
-              extra_headers.p, (extra_headers.len > 0 ? "\r\n" : ""));
-  mg_send_response_line(nc, status_code, phead);
-  if (phead != bhead) MG_FREE(phead);
-  mg_send(nc, pbody, bl);
-  if (pbody != bbody) MG_FREE(pbody);
-}
-
-void mg_send_head(struct mg_connection *c, int status_code,
-                  int64_t content_length, const char *extra_headers) {
-  mg_send_response_line(c, status_code, extra_headers);
-  if (content_length < 0) {
-    mg_printf(c, "%s", "Transfer-Encoding: chunked\r\n");
-  } else {
-    mg_printf(c, "Content-Length: %" INT64_FMT "\r\n", content_length);
-  }
-  mg_send(c, "\r\n", 2);
-}
-
-void mg_http_send_error(struct mg_connection *nc, int code,
-                        const char *reason) {
-  if (!reason) reason = mg_status_message(code);
-  LOG(LL_DEBUG, ("%p %d %s", nc, code, reason));
-  mg_send_head(nc, code, strlen(reason),
-               "Content-Type: text/plain\r\nConnection: close");
-  mg_send(nc, reason, strlen(reason));
-  nc->flags |= MG_F_SEND_AND_CLOSE;
-}
-
-#if MG_ENABLE_FILESYSTEM
-static void mg_http_construct_etag(char *buf, size_t buf_len,
-                                   const cs_stat_t *st) {
-  snprintf(buf, buf_len, "\"%lx.%" INT64_FMT "\"", (unsigned long) st->st_mtime,
-           (int64_t) st->st_size);
-}
-
-#ifndef WINCE
-static void mg_gmt_time_string(char *buf, size_t buf_len, time_t *t) {
-  strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
-}
-#else
-/* Look wince_lib.c for WindowsCE implementation */
-static void mg_gmt_time_string(char *buf, size_t buf_len, time_t *t);
-#endif
-
-static int mg_http_parse_range_header(const struct mg_str *header, int64_t *a,
-                                      int64_t *b) {
-  /*
-   * There is no snscanf. Headers are not guaranteed to be NUL-terminated,
-   * so we have this. Ugh.
-   */
-  int result;
-  char *p = (char *) MG_MALLOC(header->len + 1);
-  if (p == NULL) return 0;
-  memcpy(p, header->p, header->len);
-  p[header->len] = '\0';
-  result = sscanf(p, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
-  MG_FREE(p);
-  return result;
-}
-
-static void mg_http_serve_file_internal(struct mg_connection *nc,
-                                 struct http_message *hm, const char *path,
-                                 struct mg_str mime_type,
-                                 struct mg_str encoding,
-                                 struct mg_str extra_headers) {
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
-  cs_stat_t st;
-  LOG(LL_DEBUG, ("%p [%s] %.*s %.*s", nc, path, (int) mime_type.len,
-                 mime_type.p, (int) encoding.len, encoding.p));
-  if (mg_stat(path, &st) != 0 || (pd->file.fp = mg_fopen(path, "rb")) == NULL) {
-    int code, err = mg_get_errno();
-    switch (err) {
-      case EACCES:
-        code = 403;
-        break;
-      case ENOENT:
-        code = 404;
-        break;
-      default:
-        code = 500;
-    };
-    mg_http_send_error(nc, code, "Open failed");
-  } else {
-    char etag[50], current_time[50], last_modified[50], range[70];
-    time_t t = (time_t) mg_time();
-    int64_t r1 = 0, r2 = 0, cl = st.st_size;
-    struct mg_str *range_hdr = mg_get_http_header(hm, "Range");
-    int n, status_code = 200;
-
-    /* Handle Range header */
-    range[0] = '\0';
-    if (range_hdr != NULL &&
-        (n = mg_http_parse_range_header(range_hdr, &r1, &r2)) > 0 && r1 >= 0 &&
-        r2 >= 0) {
-      /* If range is specified like "400-", set second limit to content len */
-      if (n == 1) {
-        r2 = cl - 1;
-      }
-      if (r1 > r2 || r2 >= cl) {
-        status_code = 416;
-        cl = 0;
-        snprintf(range, sizeof(range),
-                 "Content-Range: bytes */%" INT64_FMT "\r\n",
-                 (int64_t) st.st_size);
-      } else {
-        status_code = 206;
-        cl = r2 - r1 + 1;
-        snprintf(range, sizeof(range),
-                 "Content-Range: bytes %" INT64_FMT "-%" INT64_FMT
-                 "/%" INT64_FMT "\r\n",
-                 r1, r1 + cl - 1, (int64_t) st.st_size);
-#if _FILE_OFFSET_BITS == 64 || _POSIX_C_SOURCE >= 200112L || \
-    _XOPEN_SOURCE >= 600
-        fseeko(pd->file.fp, r1, SEEK_SET);
-#else
-        fseek(pd->file.fp, (long) r1, SEEK_SET);
-#endif
-      }
-    }
-
-#if !MG_DISABLE_HTTP_KEEP_ALIVE
-    {
-      struct mg_str *conn_hdr = mg_get_http_header(hm, "Connection");
-      if (conn_hdr != NULL) {
-        pd->file.keepalive = (mg_vcasecmp(conn_hdr, "keep-alive") == 0);
-      } else {
-        pd->file.keepalive = (mg_vcmp(&hm->proto, "HTTP/1.1") == 0);
-      }
-    }
-#endif
-
-    mg_http_construct_etag(etag, sizeof(etag), &st);
-    mg_gmt_time_string(current_time, sizeof(current_time), &t);
-    mg_gmt_time_string(last_modified, sizeof(last_modified), &st.st_mtime);
-    mg_send_response_line_s(nc, status_code, extra_headers);
-    mg_printf(nc,
-              "Date: %s\r\n"
-              "Last-Modified: %s\r\n"
-              "Accept-Ranges: bytes\r\n"
-              "Content-Type: %.*s\r\n"
-              "Connection: %s\r\n"
-              "Content-Length: %" SIZE_T_FMT
-              "\r\n"
-              "%s"
-              "Etag: %s\r\n",
-              current_time, last_modified, (int) mime_type.len, mime_type.p,
-              (pd->file.keepalive ? "keep-alive" : "close"), (size_t) cl, range,
-              etag);
-    if (encoding.len > 0) {
-      mg_printf(nc, "Content-Encoding: %.*s\r\n", (int) encoding.len,
-                encoding.p);
-    }
-    mg_send(nc, "\r\n", 2);
-    pd->file.cl = cl;
-    pd->file.type = DATA_FILE;
-    mg_http_transfer_file_data(nc);
-  }
-}
-
-void mg_http_serve_file(struct mg_connection *nc, struct http_message *hm,
-                        const char *path, const struct mg_str mime_type,
-                        const struct mg_str extra_headers) {
-  mg_http_serve_file_internal(nc, hm, path, mime_type, mg_mk_str(NULL),
-                              extra_headers);
-}
-
-static void mg_http_serve_file2(struct mg_connection *nc, const char *path,
-                                struct http_message *hm,
-                                struct mg_serve_http_opts *opts) {
-#if MG_ENABLE_HTTP_SSI
-  if (mg_match_prefix(opts->ssi_pattern, strlen(opts->ssi_pattern), path) > 0) {
-    mg_handle_ssi_request(nc, hm, path, opts);
-    return;
-  }
-#endif
-  struct mg_str type = MG_NULL_STR, encoding = MG_NULL_STR;
-  if (!mg_get_mime_type_encoding(mg_mk_str(path), &type, &encoding, opts)) {
-    type = mg_mk_str("text/plain");
-  }
-  mg_http_serve_file_internal(nc, hm, path, type, encoding,
-                              mg_mk_str(opts->extra_headers));
-}
-
-#endif
-
-int mg_url_decode(const char *src, int src_len, char *dst, int dst_len,
-                  int is_form_url_encoded) {
-  int i, j, a, b;
-#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
-
-  for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
-    if (src[i] == '%') {
-      if (i < src_len - 2 && isxdigit(*(const unsigned char *) (src + i + 1)) &&
-          isxdigit(*(const unsigned char *) (src + i + 2))) {
-        a = tolower(*(const unsigned char *) (src + i + 1));
-        b = tolower(*(const unsigned char *) (src + i + 2));
-        dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
-        i += 2;
-      } else {
-        return -1;
-      }
-    } else if (is_form_url_encoded && src[i] == '+') {
-      dst[j] = ' ';
-    } else {
-      dst[j] = src[i];
-    }
-  }
-
-  dst[j] = '\0'; /* Null-terminate the destination */
-
-  return i >= src_len ? j : -1;
-}
-
-int mg_get_http_var(const struct mg_str *buf, const char *name, char *dst,
-                    size_t dst_len) {
-  const char *p, *e, *s;
-  size_t name_len;
-  int len;
-
-  /*
-   * According to the documentation function returns negative
-   * value in case of error. For debug purposes it returns:
-   * -1 - src is wrong (NUUL)
-   * -2 - dst is wrong (NULL)
-   * -3 - failed to decode url or dst is to small
-   * -4 - name does not exist
-   */
-  if (dst == NULL || dst_len == 0) {
-    len = -2;
-  } else if (buf->p == NULL || name == NULL || buf->len == 0) {
-    len = -1;
-    dst[0] = '\0';
-  } else {
-    name_len = strlen(name);
-    e = buf->p + buf->len;
-    len = -4;
-    dst[0] = '\0';
-
-    for (p = buf->p; p + name_len < e; p++) {
-      if ((p == buf->p || p[-1] == '&') && p[name_len] == '=' &&
-          !mg_ncasecmp(name, p, name_len)) {
-        p += name_len + 1;
-        s = (const char *) memchr(p, '&', (size_t)(e - p));
-        if (s == NULL) {
-          s = e;
-        }
-        len = mg_url_decode(p, (size_t)(s - p), dst, dst_len, 1);
-        /* -1 means: failed to decode or dst is too small */
-        if (len == -1) {
-          len = -3;
-        }
-        break;
-      }
-    }
-  }
-
-  return len;
-}
-
-void mg_send_http_chunk(struct mg_connection *nc, const char *buf, size_t len) {
-  char chunk_size[50];
-  int n;
-
-  n = snprintf(chunk_size, sizeof(chunk_size), "%lX\r\n", (unsigned long) len);
-  mg_send(nc, chunk_size, n);
-  mg_send(nc, buf, len);
-  mg_send(nc, "\r\n", 2);
-}
-
-void mg_printf_http_chunk(struct mg_connection *nc, const char *fmt, ...) {
-  char mem[MG_VPRINTF_BUFFER_SIZE], *buf = mem;
-  int len;
-  va_list ap;
-
-  va_start(ap, fmt);
-  len = mg_avprintf(&buf, sizeof(mem), fmt, ap);
-  va_end(ap);
-
-  if (len >= 0) {
-    mg_send_http_chunk(nc, buf, len);
-  }
-
-  /* LCOV_EXCL_START */
-  if (buf != mem && buf != NULL) {
-    MG_FREE(buf);
-  }
-  /* LCOV_EXCL_STOP */
-}
-
-void mg_printf_html_escape(struct mg_connection *nc, const char *fmt, ...) {
-  char mem[MG_VPRINTF_BUFFER_SIZE], *buf = mem;
-  int i, j, len;
-  va_list ap;
-
-  va_start(ap, fmt);
-  len = mg_avprintf(&buf, sizeof(mem), fmt, ap);
-  va_end(ap);
-
-  if (len >= 0) {
-    for (i = j = 0; i < len; i++) {
-      if (buf[i] == '<' || buf[i] == '>') {
-        mg_send(nc, buf + j, i - j);
-        mg_send(nc, buf[i] == '<' ? "&lt;" : "&gt;", 4);
-        j = i + 1;
-      }
-    }
-    mg_send(nc, buf + j, i - j);
-  }
-
-  /* LCOV_EXCL_START */
-  if (buf != mem && buf != NULL) {
-    MG_FREE(buf);
-  }
-  /* LCOV_EXCL_STOP */
-}
-
-static void mg_http_parse_header_internal(struct mg_str *hdr,
-                                          const char *var_name,
-                                          struct altbuf *ab) {
-  int ch = ' ', ch1 = ',', ch2 = ';', n = strlen(var_name);
-  const char *p, *end = hdr ? hdr->p + hdr->len : NULL, *s = NULL;
-
-  /* Find where variable starts */
-  for (s = hdr->p; s != NULL && s + n < end; s++) {
-    if ((s == hdr->p || s[-1] == ch || s[-1] == ch1 || s[-1] == ';') &&
-        s[n] == '=' && !strncmp(s, var_name, n))
-      break;
-  }
-
-  if (s != NULL && &s[n + 1] < end) {
-    s += n + 1;
-    if (*s == '"' || *s == '\'') {
-      ch = ch1 = ch2 = *s++;
-    }
-    p = s;
-    while (p < end && p[0] != ch && p[0] != ch1 && p[0] != ch2) {
-      if (ch != ' ' && p[0] == '\\' && p[1] == ch) p++;
-      altbuf_append(ab, *p++);
-    }
-
-    if (ch != ' ' && *p != ch) {
-      altbuf_reset(ab);
-    }
-  }
-
-  /* If there is some data, append a NUL. */
-  if (ab->len > 0) {
-    altbuf_append(ab, '\0');
-  }
-}
-
-int mg_http_parse_header2(struct mg_str *hdr, const char *var_name, char **buf,
-                          size_t buf_size) {
-  struct altbuf ab;
-  altbuf_init(&ab, *buf, buf_size);
-  if (hdr == NULL) return 0;
-  if (*buf != NULL && buf_size > 0) *buf[0] = '\0';
-
-  mg_http_parse_header_internal(hdr, var_name, &ab);
-
-  /*
-   * Get a (trimmed) buffer, and return a len without a NUL byte which might
-   * have been added.
-   */
-  *buf = altbuf_get_buf(&ab, 1 /* trim */);
-  return ab.len > 0 ? ab.len - 1 : 0;
-}
-
-int mg_http_parse_header(struct mg_str *hdr, const char *var_name, char *buf,
-                         size_t buf_size) {
-  char *buf2 = buf;
-
-  int len = mg_http_parse_header2(hdr, var_name, &buf2, buf_size);
-
-  if (buf2 != buf) {
-    /* Buffer was not enough and was reallocated: free it and just return 0 */
-    MG_FREE(buf2);
-    return 0;
-  }
-
-  return len;
-}
-
-int mg_get_http_basic_auth(struct http_message *hm, char *user, size_t user_len,
-                           char *pass, size_t pass_len) {
-  struct mg_str *hdr = mg_get_http_header(hm, "Authorization");
-  if (hdr == NULL) return -1;
-  return mg_parse_http_basic_auth(hdr, user, user_len, pass, pass_len);
-}
-
-int mg_parse_http_basic_auth(struct mg_str *hdr, char *user, size_t user_len,
-                             char *pass, size_t pass_len) {
-  char *buf = NULL;
-  char fmt[64];
-  int res = 0;
-
-  if (mg_strncmp(*hdr, mg_mk_str("Basic "), 6) != 0) return -1;
-
-  buf = (char *) MG_MALLOC(hdr->len);
-  cs_base64_decode((unsigned char *) hdr->p + 6, hdr->len, buf, NULL);
-
-  /* e.g. "%123[^:]:%321[^\n]" */
-  snprintf(fmt, sizeof(fmt), "%%%" SIZE_T_FMT "[^:]:%%%" SIZE_T_FMT "[^\n]",
-           user_len - 1, pass_len - 1);
-  if (sscanf(buf, fmt, user, pass) == 0) {
-    res = -1;
-  }
-
-  MG_FREE(buf);
-  return res;
-}
-
-#if MG_ENABLE_FILESYSTEM
-static int mg_is_file_hidden(const char *path,
-                             const struct mg_serve_http_opts *opts,
-                             int exclude_specials) {
-  const char *p1 = opts->per_directory_auth_file;
-  const char *p2 = opts->hidden_file_pattern;
-
-  /* Strip directory path from the file name */
-  const char *pdir = strrchr(path, DIRSEP);
-  if (pdir != NULL) {
-    path = pdir + 1;
-  }
-
-  return (exclude_specials && (!strcmp(path, ".") || !strcmp(path, ".."))) ||
-         (p1 != NULL && mg_match_prefix(p1, strlen(p1), path) == strlen(p1)) ||
-         (p2 != NULL && mg_match_prefix(p2, strlen(p2), path) > 0);
-}
-
-#if !MG_DISABLE_HTTP_DIGEST_AUTH
-
-#ifndef MG_EXT_MD5
-void mg_hash_md5_v(size_t num_msgs, const uint8_t *msgs[],
-                   const size_t *msg_lens, uint8_t *digest) {
-  size_t i;
-  cs_md5_ctx md5_ctx;
-  cs_md5_init(&md5_ctx);
-  for (i = 0; i < num_msgs; i++) {
-    cs_md5_update(&md5_ctx, msgs[i], msg_lens[i]);
-  }
-  cs_md5_final(digest, &md5_ctx);
-}
-#else
-extern void mg_hash_md5_v(size_t num_msgs, const uint8_t *msgs[],
-                          const size_t *msg_lens, uint8_t *digest);
-#endif
-
-static void cs_md5(char buf[33], ...) {
-  unsigned char hash[16];
-  const uint8_t *msgs[20], *p;
-  size_t msg_lens[20];
-  size_t num_msgs = 0;
-  va_list ap;
-
-  va_start(ap, buf);
-  while ((p = va_arg(ap, const unsigned char *)) != NULL) {
-    msgs[num_msgs] = p;
-    msg_lens[num_msgs] = va_arg(ap, size_t);
-    num_msgs++;
-  }
-  va_end(ap);
-
-  mg_hash_md5_v(num_msgs, msgs, msg_lens, hash);
-  cs_to_hex(buf, hash, sizeof(hash));
-}
-
-static void mg_mkmd5resp(const char *method, size_t method_len, const char *uri,
-                         size_t uri_len, const char *ha1, size_t ha1_len,
-                         const char *nonce, size_t nonce_len, const char *nc,
-                         size_t nc_len, const char *cnonce, size_t cnonce_len,
-                         const char *qop, size_t qop_len, char *resp) {
-  static const char colon[] = ":";
-  static const size_t one = 1;
-  char ha2[33];
-  cs_md5(ha2, method, method_len, colon, one, uri, uri_len, NULL);
-  cs_md5(resp, ha1, ha1_len, colon, one, nonce, nonce_len, colon, one, nc,
-         nc_len, colon, one, cnonce, cnonce_len, colon, one, qop, qop_len,
-         colon, one, ha2, sizeof(ha2) - 1, NULL);
-}
-
-int mg_http_create_digest_auth_header(char *buf, size_t buf_len,
-                                      const char *method, const char *uri,
-                                      const char *auth_domain, const char *user,
-                                      const char *passwd, const char *nonce) {
-  static const char colon[] = ":", qop[] = "auth";
-  static const size_t one = 1;
-  char ha1[33], resp[33], cnonce[40];
-
-  snprintf(cnonce, sizeof(cnonce), "%lx", (unsigned long) mg_time());
-  cs_md5(ha1, user, (size_t) strlen(user), colon, one, auth_domain,
-         (size_t) strlen(auth_domain), colon, one, passwd,
-         (size_t) strlen(passwd), NULL);
-  mg_mkmd5resp(method, strlen(method), uri, strlen(uri), ha1, sizeof(ha1) - 1,
-               nonce, strlen(nonce), "1", one, cnonce, strlen(cnonce), qop,
-               sizeof(qop) - 1, resp);
-  return snprintf(buf, buf_len,
-                  "Authorization: Digest username=\"%s\","
-                  "realm=\"%s\",uri=\"%s\",qop=%s,nc=1,cnonce=%s,"
-                  "nonce=%s,response=%s\r\n",
-                  user, auth_domain, uri, qop, cnonce, nonce, resp);
-}
-
-/*
- * Check for authentication timeout.
- * Clients send time stamp encoded in nonce. Make sure it is not too old,
- * to prevent replay attacks.
- * Assumption: nonce is a hexadecimal number of seconds since 1970.
- */
-static int mg_check_nonce(const char *nonce) {
-  unsigned long now = (unsigned long) mg_time();
-  unsigned long val = (unsigned long) strtoul(nonce, NULL, 16);
-  return (now >= val) && (now - val < 60 * 60);
-}
-
-int mg_http_check_digest_auth(struct http_message *hm, const char *auth_domain,
-                              FILE *fp) {
-  int ret = 0;
-  struct mg_str *hdr;
-  char username_buf[50], cnonce_buf[64], response_buf[40], uri_buf[200],
-      qop_buf[20], nc_buf[20], nonce_buf[16];
-
-  char *username = username_buf, *cnonce = cnonce_buf, *response = response_buf,
-       *uri = uri_buf, *qop = qop_buf, *nc = nc_buf, *nonce = nonce_buf;
-
-  /* Parse "Authorization:" header, fail fast on parse error */
-  if (hm == NULL || fp == NULL ||
-      (hdr = mg_get_http_header(hm, "Authorization")) == NULL ||
-      mg_http_parse_header2(hdr, "username", &username, sizeof(username_buf)) ==
-          0 ||
-      mg_http_parse_header2(hdr, "cnonce", &cnonce, sizeof(cnonce_buf)) == 0 ||
-      mg_http_parse_header2(hdr, "response", &response, sizeof(response_buf)) ==
-          0 ||
-      mg_http_parse_header2(hdr, "uri", &uri, sizeof(uri_buf)) == 0 ||
-      mg_http_parse_header2(hdr, "qop", &qop, sizeof(qop_buf)) == 0 ||
-      mg_http_parse_header2(hdr, "nc", &nc, sizeof(nc_buf)) == 0 ||
-      mg_http_parse_header2(hdr, "nonce", &nonce, sizeof(nonce_buf)) == 0 ||
-      mg_check_nonce(nonce) == 0) {
-    ret = 0;
-    goto clean;
-  }
-
-  /* NOTE(lsm): due to a bug in MSIE, we do not compare URIs */
-
-  ret = mg_check_digest_auth(
-      hm->method,
-      mg_mk_str_n(
-          hm->uri.p,
-          hm->uri.len + (hm->query_string.len ? hm->query_string.len + 1 : 0)),
-      mg_mk_str(username), mg_mk_str(cnonce), mg_mk_str(response),
-      mg_mk_str(qop), mg_mk_str(nc), mg_mk_str(nonce), mg_mk_str(auth_domain),
-      fp);
-
-clean:
-  if (username != username_buf) MG_FREE(username);
-  if (cnonce != cnonce_buf) MG_FREE(cnonce);
-  if (response != response_buf) MG_FREE(response);
-  if (uri != uri_buf) MG_FREE(uri);
-  if (qop != qop_buf) MG_FREE(qop);
-  if (nc != nc_buf) MG_FREE(nc);
-  if (nonce != nonce_buf) MG_FREE(nonce);
-
-  return ret;
-}
-
-int mg_check_digest_auth(struct mg_str method, struct mg_str uri,
-                         struct mg_str username, struct mg_str cnonce,
-                         struct mg_str response, struct mg_str qop,
-                         struct mg_str nc, struct mg_str nonce,
-                         struct mg_str auth_domain, FILE *fp) {
-  char buf[128], f_user[sizeof(buf)], f_ha1[sizeof(buf)], f_domain[sizeof(buf)];
-  char exp_resp[33];
-
-  /*
-   * Read passwords file line by line. If should have htdigest format,
-   * i.e. each line should be a colon-separated sequence:
-   * USER_NAME:DOMAIN_NAME:HA1_HASH_OF_USER_DOMAIN_AND_PASSWORD
-   */
-  while (fgets(buf, sizeof(buf), fp) != NULL) {
-    if (sscanf(buf, "%[^:]:%[^:]:%s", f_user, f_domain, f_ha1) == 3 &&
-        mg_vcmp(&username, f_user) == 0 &&
-        mg_vcmp(&auth_domain, f_domain) == 0) {
-      /* Username and domain matched, check the password */
-      mg_mkmd5resp(method.p, method.len, uri.p, uri.len, f_ha1, strlen(f_ha1),
-                   nonce.p, nonce.len, nc.p, nc.len, cnonce.p, cnonce.len,
-                   qop.p, qop.len, exp_resp);
-      LOG(LL_DEBUG, ("%.*s %s %.*s %s", (int) username.len, username.p,
-                     f_domain, (int) response.len, response.p, exp_resp));
-      return mg_ncasecmp(response.p, exp_resp, strlen(exp_resp)) == 0;
-    }
-  }
-
-  /* None of the entries in the passwords file matched - return failure */
-  return 0;
-}
-
-int mg_http_is_authorized(struct http_message *hm, struct mg_str path,
-                          const char *domain, const char *passwords_file,
-                          int flags) {
-  char buf[MG_MAX_PATH];
-  const char *p;
-  FILE *fp;
-  int authorized = 1;
-
-  if (domain != NULL && passwords_file != NULL) {
-    if (flags & MG_AUTH_FLAG_IS_GLOBAL_PASS_FILE) {
-      fp = mg_fopen(passwords_file, "r");
-    } else if (flags & MG_AUTH_FLAG_IS_DIRECTORY) {
-      snprintf(buf, sizeof(buf), "%.*s%c%s", (int) path.len, path.p, DIRSEP,
-               passwords_file);
-      fp = mg_fopen(buf, "r");
-    } else {
-      p = strrchr(path.p, DIRSEP);
-      if (p == NULL) p = path.p;
-      snprintf(buf, sizeof(buf), "%.*s%c%s", (int) (p - path.p), path.p, DIRSEP,
-               passwords_file);
-      fp = mg_fopen(buf, "r");
-    }
-
-    if (fp != NULL) {
-      authorized = mg_http_check_digest_auth(hm, domain, fp);
-      fclose(fp);
-    } else if (!(flags & MG_AUTH_FLAG_ALLOW_MISSING_FILE)) {
-      authorized = 0;
-    }
-  }
-
-  LOG(LL_DEBUG, ("%.*s %s %x %d", (int) path.len, path.p,
-                 passwords_file ? passwords_file : "", flags, authorized));
-  return authorized;
-}
-#else
-int mg_http_is_authorized(struct http_message *hm, const struct mg_str path,
-                          const char *domain, const char *passwords_file,
-                          int flags) {
-  (void) hm;
-  (void) path;
-  (void) domain;
-  (void) passwords_file;
-  (void) flags;
-  return 1;
-}
-#endif
-
-#if MG_ENABLE_DIRECTORY_LISTING
-static void mg_escape(const char *src, char *dst, size_t dst_len) {
-  size_t n = 0;
-  while (*src != '\0' && n + 5 < dst_len) {
-    unsigned char ch = *(unsigned char *) src++;
-    if (ch == '<') {
-      n += snprintf(dst + n, dst_len - n, "%s", "&lt;");
-    } else {
-      dst[n++] = ch;
-    }
-  }
-  dst[n] = '\0';
-}
-
-static void mg_print_dir_entry(struct mg_connection *nc, const char *file_name,
-                               cs_stat_t *stp) {
-  char size[64], mod[64], path[MG_MAX_PATH];
-  int64_t fsize = stp->st_size;
-  int is_dir = S_ISDIR(stp->st_mode);
-  const char *slash = is_dir ? "/" : "";
-  struct mg_str href;
-
-  if (is_dir) {
-    snprintf(size, sizeof(size), "%s", "[DIRECTORY]");
-  } else {
-    /*
-     * We use (double) cast below because MSVC 6 compiler cannot
-     * convert unsigned __int64 to double.
-     */
-    if (fsize < 1024) {
-      snprintf(size, sizeof(size), "%d", (int) fsize);
-    } else if (fsize < 0x100000) {
-      snprintf(size, sizeof(size), "%.1fk", (double) fsize / 1024.0);
-    } else if (fsize < 0x40000000) {
-      snprintf(size, sizeof(size), "%.1fM", (double) fsize / 1048576);
-    } else {
-      snprintf(size, sizeof(size), "%.1fG", (double) fsize / 1073741824);
-    }
-  }
-  strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&stp->st_mtime));
-  mg_escape(file_name, path, sizeof(path));
-  href = mg_url_encode(mg_mk_str(file_name));
-  mg_printf_http_chunk(nc,
-                       "<tr><td><a href=\"%s%s\">%s%s</a></td>"
-                       "<td>%s</td><td name=\"%" INT64_FMT "\">%s</td></tr>",
-                       href.p, slash, path, slash, mod, is_dir ? -1 : fsize,
-                       size);
-  free((void *) href.p);
-}
-
-static void mg_scan_directory(struct mg_connection *nc, const char *dir,
-                              const struct mg_serve_http_opts *opts,
-                              void (*func)(struct mg_connection *, const char *,
-                                           cs_stat_t *)) {
-  char path[MG_MAX_PATH + 1];
-  cs_stat_t st;
-  struct dirent *dp;
-  DIR *dirp;
-
-  LOG(LL_DEBUG, ("%p [%s]", nc, dir));
-  if ((dirp = (opendir(dir))) != NULL) {
-    while ((dp = readdir(dirp)) != NULL) {
-      /* Do not show current dir and hidden files */
-      if (mg_is_file_hidden((const char *) dp->d_name, opts, 1)) {
-        continue;
-      }
-      snprintf(path, sizeof(path), "%s/%s", dir, dp->d_name);
-      if (mg_stat(path, &st) == 0) {
-        func(nc, (const char *) dp->d_name, &st);
-      }
-    }
-    closedir(dirp);
-  } else {
-    LOG(LL_DEBUG, ("%p opendir(%s) -> %d", nc, dir, mg_get_errno()));
-  }
-}
-
-static void mg_send_directory_listing(struct mg_connection *nc, const char *dir,
-                                      struct http_message *hm,
-                                      struct mg_serve_http_opts *opts) {
-  static const char *sort_js_code =
-      "<script>function srt(tb, sc, so, d) {"
-      "var tr = Array.prototype.slice.call(tb.rows, 0),"
-      "tr = tr.sort(function (a, b) { var c1 = a.cells[sc], c2 = b.cells[sc],"
-      "n1 = c1.getAttribute('name'), n2 = c2.getAttribute('name'), "
-      "t1 = a.cells[2].getAttribute('name'), "
-      "t2 = b.cells[2].getAttribute('name'); "
-      "return so * (t1 < 0 && t2 >= 0 ? -1 : t2 < 0 && t1 >= 0 ? 1 : "
-      "n1 ? parseInt(n2) - parseInt(n1) : "
-      "c1.textContent.trim().localeCompare(c2.textContent.trim())); });";
-  static const char *sort_js_code2 =
-      "for (var i = 0; i < tr.length; i++) tb.appendChild(tr[i]); "
-      "if (!d) window.location.hash = ('sc=' + sc + '&so=' + so); "
-      "};"
-      "window.onload = function() {"
-      "var tb = document.getElementById('tb');"
-      "var m = /sc=([012]).so=(1|-1)/.exec(window.location.hash) || [0, 2, 1];"
-      "var sc = m[1], so = m[2]; document.onclick = function(ev) { "
-      "var c = ev.target.rel; if (c) {if (c == sc) so *= -1; srt(tb, c, so); "
-      "sc = c; ev.preventDefault();}};"
-      "srt(tb, sc, so, true);"
-      "}"
-      "</script>";
-
-  mg_send_response_line(nc, 200, opts->extra_headers);
-  mg_printf(nc, "%s: %s\r\n%s: %s\r\n\r\n", "Transfer-Encoding", "chunked",
-            "Content-Type", "text/html; charset=utf-8");
-
-  mg_printf_http_chunk(
-      nc,
-      "<!DOCTYPE html><html><head><title>Index of %.*s</title>%s%s"
-      "<style>th,td {text-align: left; padding-right: 1em; "
-      "font-family: monospace; }</style></head>"
-      "<body><h1>Index of %.*s</h1><table cellpadding=\"0\"><thead>"
-      "<tr><th><a href=\"#\" rel=\"0\">Name</a></th><th>"
-      "<a href=\"#\" rel=\"1\">Modified</a></th>"
-      "<th><a href=\"#\" rel=\"2\">Size</a></th></tr>"
-      "<tr><td colspan=\"3\"><hr></td></tr>"
-      "</thead>"
-      "<tbody id=\"tb\">",
-      (int) hm->uri.len, hm->uri.p, sort_js_code, sort_js_code2,
-      (int) hm->uri.len, hm->uri.p);
-  mg_scan_directory(nc, dir, opts, mg_print_dir_entry);
-  mg_printf_http_chunk(nc,
-                       "</tbody>"
-                       "<tfoot><tr><td colspan=\"3\"><hr></td></tr></tfoot>"
-                       "</table>"
-                       "<address>%s</address>"
-                       "</body></html>",
-                       mg_version_header);
-  mg_send_http_chunk(nc, "", 0);
-  /* TODO(rojer): Remove when cesanta/dev/issues/197 is fixed. */
-  nc->flags |= MG_F_SEND_AND_CLOSE;
-}
-#endif /* MG_ENABLE_DIRECTORY_LISTING */
-
-/*
- * Given a directory path, find one of the files specified in the
- * comma-separated list of index files `list`.
- * First found index file wins. If an index file is found, then gets
- * appended to the `path`, stat-ed, and result of `stat()` passed to `stp`.
- * If index file is not found, then `path` and `stp` remain unchanged.
- */
-MG_INTERNAL void mg_find_index_file(const char *path, const char *list,
-                                    char **index_file, cs_stat_t *stp) {
-  struct mg_str vec;
-  size_t path_len = strlen(path);
-  int found = 0;
-  *index_file = NULL;
-
-  /* Traverse index files list. For each entry, append it to the given */
-  /* path and see if the file exists. If it exists, break the loop */
-  while ((list = mg_next_comma_list_entry(list, &vec, NULL)) != NULL) {
-    cs_stat_t st;
-    size_t len = path_len + 1 + vec.len + 1;
-    *index_file = (char *) MG_REALLOC(*index_file, len);
-    if (*index_file == NULL) break;
-    snprintf(*index_file, len, "%s%c%.*s", path, DIRSEP, (int) vec.len, vec.p);
-
-    /* Does it exist? Is it a file? */
-    if (mg_stat(*index_file, &st) == 0 && S_ISREG(st.st_mode)) {
-      /* Yes it does, break the loop */
-      *stp = st;
-      found = 1;
-      break;
-    }
-  }
-  if (!found) {
-    MG_FREE(*index_file);
-    *index_file = NULL;
-  }
-  LOG(LL_DEBUG, ("[%s] [%s]", path, (*index_file ? *index_file : "")));
-}
-
-#if MG_ENABLE_HTTP_URL_REWRITES
-static int mg_http_send_port_based_redirect(
-    struct mg_connection *c, struct http_message *hm,
-    const struct mg_serve_http_opts *opts) {
-  const char *rewrites = opts->url_rewrites;
-  struct mg_str a, b;
-  char local_port[20] = {'%'};
-
-  mg_conn_addr_to_str(c, local_port + 1, sizeof(local_port) - 1,
-                      MG_SOCK_STRINGIFY_PORT);
-
-  while ((rewrites = mg_next_comma_list_entry(rewrites, &a, &b)) != NULL) {
-    if (mg_vcmp(&a, local_port) == 0) {
-      mg_send_response_line(c, 301, NULL);
-      mg_printf(c, "Content-Length: 0\r\nLocation: %.*s%.*s\r\n\r\n",
-                (int) b.len, b.p, (int) (hm->proto.p - hm->uri.p - 1),
-                hm->uri.p);
-      return 1;
-    }
-  }
-
-  return 0;
-}
-
-static void mg_reverse_proxy_handler(struct mg_connection *nc, int ev,
-                                     void *ev_data MG_UD_ARG(void *user_data)) {
-  struct http_message *hm = (struct http_message *) ev_data;
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
-
-  if (pd == NULL || pd->reverse_proxy_data.linked_conn == NULL) {
-    DBG(("%p: upstream closed", nc));
-    return;
-  }
-
-  switch (ev) {
-    case MG_EV_CONNECT:
-      if (*(int *) ev_data != 0) {
-        mg_http_send_error(pd->reverse_proxy_data.linked_conn, 502, NULL);
-      }
-      break;
-    /* TODO(mkm): handle streaming */
-    case MG_EV_HTTP_REPLY:
-      mg_send(pd->reverse_proxy_data.linked_conn, hm->message.p,
-              hm->message.len);
-      pd->reverse_proxy_data.linked_conn->flags |= MG_F_SEND_AND_CLOSE;
-      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      break;
-    case MG_EV_CLOSE:
-      pd->reverse_proxy_data.linked_conn->flags |= MG_F_SEND_AND_CLOSE;
-      break;
-  }
-
-#if MG_ENABLE_CALLBACK_USERDATA
-  (void) user_data;
-#endif
-}
-
-void mg_http_reverse_proxy(struct mg_connection *nc,
-                           const struct http_message *hm, struct mg_str mount,
-                           struct mg_str upstream) {
-  struct mg_connection *be;
-  char burl[256], *purl = burl;
-  int i;
-  const char *error;
-  struct mg_connect_opts opts;
-  struct mg_str path = MG_NULL_STR, user_info = MG_NULL_STR, host = MG_NULL_STR;
-  memset(&opts, 0, sizeof(opts));
-  opts.error_string = &error;
-
-  mg_asprintf(&purl, sizeof(burl), "%.*s%.*s", (int) upstream.len, upstream.p,
-              (int) (hm->uri.len - mount.len), hm->uri.p + mount.len);
-
-  be = mg_connect_http_base(nc->mgr, MG_CB(mg_reverse_proxy_handler, NULL),
-                            opts, "http", NULL, "https", NULL, purl, &path,
-                            &user_info, &host);
-  LOG(LL_DEBUG, ("Proxying %.*s to %s (rule: %.*s)", (int) hm->uri.len,
-                 hm->uri.p, purl, (int) mount.len, mount.p));
-
-  if (be == NULL) {
-    LOG(LL_ERROR, ("Error connecting to %s: %s", purl, error));
-    mg_http_send_error(nc, 502, NULL);
-    goto cleanup;
-  }
-
-  /* link connections to each other, they must live and die together */
-  mg_http_get_proto_data(be)->reverse_proxy_data.linked_conn = nc;
-  mg_http_get_proto_data(nc)->reverse_proxy_data.linked_conn = be;
-
-  /* send request upstream */
-  mg_printf(be, "%.*s %.*s HTTP/1.1\r\n", (int) hm->method.len, hm->method.p,
-            (int) path.len, path.p);
-
-  mg_printf(be, "Host: %.*s\r\n", (int) host.len, host.p);
-  for (i = 0; i < MG_MAX_HTTP_HEADERS && hm->header_names[i].len > 0; i++) {
-    struct mg_str hn = hm->header_names[i];
-    struct mg_str hv = hm->header_values[i];
-
-    /* we rewrite the host header */
-    if (mg_vcasecmp(&hn, "Host") == 0) continue;
-    /*
-     * Don't pass chunked transfer encoding to the client because hm->body is
-     * already dechunked when we arrive here.
-     */
-    if (mg_vcasecmp(&hn, "Transfer-encoding") == 0 &&
-        mg_vcasecmp(&hv, "chunked") == 0) {
-      mg_printf(be, "Content-Length: %" SIZE_T_FMT "\r\n", hm->body.len);
-      continue;
-    }
-    /* We don't support proxying Expect: 100-continue. */
-    if (mg_vcasecmp(&hn, "Expect") == 0 &&
-        mg_vcasecmp(&hv, "100-continue") == 0) {
-      continue;
-    }
-
-    mg_printf(be, "%.*s: %.*s\r\n", (int) hn.len, hn.p, (int) hv.len, hv.p);
-  }
-
-  mg_send(be, "\r\n", 2);
-  mg_send(be, hm->body.p, hm->body.len);
-
-cleanup:
-  if (purl != burl) MG_FREE(purl);
-}
-
-static int mg_http_handle_forwarding(struct mg_connection *nc,
-                                     struct http_message *hm,
-                                     const struct mg_serve_http_opts *opts) {
-  const char *rewrites = opts->url_rewrites;
-  struct mg_str a, b;
-  struct mg_str p1 = MG_MK_STR("http://"), p2 = MG_MK_STR("https://");
-
-  while ((rewrites = mg_next_comma_list_entry(rewrites, &a, &b)) != NULL) {
-    if (mg_strncmp(a, hm->uri, a.len) == 0) {
-      if (mg_strncmp(b, p1, p1.len) == 0 || mg_strncmp(b, p2, p2.len) == 0) {
-        mg_http_reverse_proxy(nc, hm, a, b);
-        return 1;
-      }
-    }
-  }
-
-  return 0;
-}
-#endif /* MG_ENABLE_FILESYSTEM */
-
-MG_INTERNAL int mg_uri_to_local_path(struct http_message *hm,
-                                     const struct mg_serve_http_opts *opts,
-                                     char **local_path,
-                                     struct mg_str *remainder) {
-  int ok = 1;
-  const char *cp = hm->uri.p, *cp_end = hm->uri.p + hm->uri.len;
-  struct mg_str root = {NULL, 0};
-  const char *file_uri_start = cp;
-  *local_path = NULL;
-  remainder->p = NULL;
-  remainder->len = 0;
-
-  { /* 1. Determine which root to use. */
-
-#if MG_ENABLE_HTTP_URL_REWRITES
-    const char *rewrites = opts->url_rewrites;
-#else
-    const char *rewrites = "";
-#endif
-    struct mg_str *hh = mg_get_http_header(hm, "Host");
-    struct mg_str a, b;
-    /* Check rewrites first. */
-    while ((rewrites = mg_next_comma_list_entry(rewrites, &a, &b)) != NULL) {
-      if (a.len > 1 && a.p[0] == '@') {
-        /* Host rewrite. */
-        if (hh != NULL && hh->len == a.len - 1 &&
-            mg_ncasecmp(a.p + 1, hh->p, a.len - 1) == 0) {
-          root = b;
-          break;
-        }
-      } else {
-        /* Regular rewrite, URI=directory */
-        size_t match_len = mg_match_prefix_n(a, hm->uri);
-        if (match_len > 0) {
-          file_uri_start = hm->uri.p + match_len;
-          if (*file_uri_start == '/' || file_uri_start == cp_end) {
-            /* Match ended at component boundary, ok. */
-          } else if (*(file_uri_start - 1) == '/') {
-            /* Pattern ends with '/', backtrack. */
-            file_uri_start--;
-          } else {
-            /* No match: must fall on the component boundary. */
-            continue;
-          }
-          root = b;
-          break;
-        }
-      }
-    }
-    /* If no rewrite rules matched, use DAV or regular document root. */
-    if (root.p == NULL) {
-#if MG_ENABLE_HTTP_WEBDAV
-      if (opts->dav_document_root != NULL && mg_is_dav_request(&hm->method)) {
-        root.p = opts->dav_document_root;
-        root.len = strlen(opts->dav_document_root);
-      } else
-#endif
-      {
-        root.p = opts->document_root;
-        root.len = strlen(opts->document_root);
-      }
-    }
-    assert(root.p != NULL && root.len > 0);
-  }
-
-  { /* 2. Find where in the canonical URI path the local path ends. */
-    const char *u = file_uri_start + 1;
-    char *lp = (char *) MG_MALLOC(root.len + hm->uri.len + 1);
-    char *lp_end = lp + root.len + hm->uri.len + 1;
-    char *p = lp, *ps;
-    int exists = 1;
-    if (lp == NULL) {
-      ok = 0;
-      goto out;
-    }
-    memcpy(p, root.p, root.len);
-    p += root.len;
-    if (*(p - 1) == DIRSEP) p--;
-    *p = '\0';
-    ps = p;
-
-    /* Chop off URI path components one by one and build local path. */
-    while (u <= cp_end) {
-      const char *next = u;
-      struct mg_str component;
-      if (exists) {
-        cs_stat_t st;
-        exists = (mg_stat(lp, &st) == 0);
-        if (exists && S_ISREG(st.st_mode)) {
-          /* We found the terminal, the rest of the URI (if any) is path_info.
-           */
-          if (*(u - 1) == '/') u--;
-          break;
-        }
-      }
-      if (u >= cp_end) break;
-      parse_uri_component((const char **) &next, cp_end, "/", &component);
-      if (component.len > 0) {
-        int len;
-        memmove(p + 1, component.p, component.len);
-        len = mg_url_decode(p + 1, component.len, p + 1, lp_end - p - 1, 0);
-        if (len <= 0) {
-          ok = 0;
-          break;
-        }
-        component.p = p + 1;
-        component.len = len;
-        if (mg_vcmp(&component, ".") == 0) {
-          /* Yum. */
-        } else if (mg_vcmp(&component, "..") == 0) {
-          while (p > ps && *p != DIRSEP) p--;
-          *p = '\0';
-        } else {
-          size_t i;
-#ifdef _WIN32
-          /* On Windows, make sure it's valid Unicode (no funny stuff). */
-          wchar_t buf[MG_MAX_PATH * 2];
-          if (to_wchar(component.p, buf, MG_MAX_PATH) == 0) {
-            DBG(("[%.*s] smells funny", (int) component.len, component.p));
-            ok = 0;
-            break;
-          }
-#endif
-          *p++ = DIRSEP;
-          /* No NULs and DIRSEPs in the component (percent-encoded). */
-          for (i = 0; i < component.len; i++, p++) {
-            if (*p == '\0' ||
-                *p == DIRSEP
-#ifdef _WIN32
-                /* On Windows, "/" is also accepted, so check for that too. */
-                || *p == '/'
-#endif
-            ) {
-              ok = 0;
-              break;
-            }
-          }
-        }
-      }
-      u = next;
-    }
-    if (ok) {
-      *local_path = lp;
-      if (u > cp_end) u = cp_end;
-      remainder->p = u;
-      remainder->len = cp_end - u;
-    } else {
-      MG_FREE(lp);
-    }
-  }
-
-out:
-  LOG(LL_DEBUG,
-      ("'%.*s' -> '%s' + '%.*s'", (int) hm->uri.len, hm->uri.p,
-       *local_path ? *local_path : "", (int) remainder->len, remainder->p));
-  return ok;
-}
-
-static int mg_get_month_index(const char *s) {
-  static const char *month_names[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
-                                      "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
-  size_t i;
-
-  for (i = 0; i < ARRAY_SIZE(month_names); i++)
-    if (!strcmp(s, month_names[i])) return (int) i;
-
-  return -1;
-}
-
-static int mg_num_leap_years(int year) {
-  return year / 4 - year / 100 + year / 400;
-}
-
-/* Parse UTC date-time string, and return the corresponding time_t value. */
-MG_INTERNAL time_t mg_parse_date_string(const char *datetime) {
-  static const unsigned short days_before_month[] = {
-      0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
-  char month_str[32];
-  int second, minute, hour, day, month, year, leap_days, days;
-  time_t result = (time_t) 0;
-
-  if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d", &day, month_str, &year, &hour,
-               &minute, &second) == 6) ||
-       (sscanf(datetime, "%d %3s %d %d:%d:%d", &day, month_str, &year, &hour,
-               &minute, &second) == 6) ||
-       (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d", &day, month_str, &year,
-               &hour, &minute, &second) == 6) ||
-       (sscanf(datetime, "%d-%3s-%d %d:%d:%d", &day, month_str, &year, &hour,
-               &minute, &second) == 6)) &&
-      year > 1970 && (month = mg_get_month_index(month_str)) != -1) {
-    leap_days = mg_num_leap_years(year) - mg_num_leap_years(1970);
-    year -= 1970;
-    days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
-    result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
-  }
-
-  return result;
-}
-
-MG_INTERNAL int mg_is_not_modified(struct http_message *hm, cs_stat_t *st) {
-  struct mg_str *hdr;
-  if ((hdr = mg_get_http_header(hm, "If-None-Match")) != NULL) {
-    char etag[64];
-    mg_http_construct_etag(etag, sizeof(etag), st);
-    return mg_vcasecmp(hdr, etag) == 0;
-  } else if ((hdr = mg_get_http_header(hm, "If-Modified-Since")) != NULL) {
-    return st->st_mtime <= mg_parse_date_string(hdr->p);
-  } else {
-    return 0;
-  }
-}
-
-void mg_http_send_digest_auth_request(struct mg_connection *c,
-                                      const char *domain) {
-  mg_printf(c,
-            "HTTP/1.1 401 Unauthorized\r\n"
-            "WWW-Authenticate: Digest qop=\"auth\", "
-            "realm=\"%s\", nonce=\"%lx\"\r\n"
-            "Content-Length: 0\r\n\r\n",
-            domain, (unsigned long) mg_time());
-}
-
-static void mg_http_send_options(struct mg_connection *nc,
-                                 struct mg_serve_http_opts *opts) {
-  mg_send_response_line(nc, 200, opts->extra_headers);
-  mg_printf(nc, "%s",
-            "Allow: GET, POST, HEAD, CONNECT, OPTIONS"
-#if MG_ENABLE_HTTP_WEBDAV
-            ", MKCOL, PUT, DELETE, PROPFIND, MOVE\r\nDAV: 1,2"
-#endif
-            "\r\n\r\n");
-  nc->flags |= MG_F_SEND_AND_CLOSE;
-}
-
-static int mg_is_creation_request(const struct http_message *hm) {
-  return mg_vcmp(&hm->method, "MKCOL") == 0 || mg_vcmp(&hm->method, "PUT") == 0;
-}
-
-MG_INTERNAL void mg_send_http_file(struct mg_connection *nc, char *path,
-                                   const struct mg_str *path_info,
-                                   struct http_message *hm,
-                                   struct mg_serve_http_opts *opts) {
-  int exists, is_directory, is_cgi;
-#if MG_ENABLE_HTTP_WEBDAV
-  int is_dav = mg_is_dav_request(&hm->method);
-#else
-  int is_dav = 0;
-#endif
-  char *index_file = NULL;
-  cs_stat_t st;
-
-  exists = (mg_stat(path, &st) == 0);
-  is_directory = exists && S_ISDIR(st.st_mode);
-
-  if (is_directory)
-    mg_find_index_file(path, opts->index_files, &index_file, &st);
-
-  is_cgi =
-      (mg_match_prefix(opts->cgi_file_pattern, strlen(opts->cgi_file_pattern),
-                       index_file ? index_file : path) > 0);
-
-  LOG(LL_DEBUG,
-      ("%p %.*s [%s] exists=%d is_dir=%d is_dav=%d is_cgi=%d index=%s", nc,
-       (int) hm->method.len, hm->method.p, path, exists, is_directory, is_dav,
-       is_cgi, index_file ? index_file : ""));
-
-  if (is_directory && hm->uri.p[hm->uri.len - 1] != '/' && !is_dav) {
-    mg_printf(nc,
-              "HTTP/1.1 301 Moved\r\nLocation: %.*s/\r\n"
-              "Content-Length: 0\r\n\r\n",
-              (int) hm->uri.len, hm->uri.p);
-    MG_FREE(index_file);
-    return;
-  }
-
-  /* If we have path_info, the only way to handle it is CGI. */
-  if (path_info->len > 0 && !is_cgi) {
-    mg_http_send_error(nc, 501, NULL);
-    MG_FREE(index_file);
-    return;
-  }
-
-  if (is_dav && opts->dav_document_root == NULL) {
-    mg_http_send_error(nc, 501, NULL);
-  } else if (!mg_http_is_authorized(
-                 hm, mg_mk_str(path), opts->auth_domain, opts->global_auth_file,
-                 ((is_directory ? MG_AUTH_FLAG_IS_DIRECTORY : 0) |
-                  MG_AUTH_FLAG_IS_GLOBAL_PASS_FILE |
-                  MG_AUTH_FLAG_ALLOW_MISSING_FILE)) ||
-             !mg_http_is_authorized(
-                 hm, mg_mk_str(path), opts->auth_domain,
-                 opts->per_directory_auth_file,
-                 ((is_directory ? MG_AUTH_FLAG_IS_DIRECTORY : 0) |
-                  MG_AUTH_FLAG_ALLOW_MISSING_FILE))) {
-    mg_http_send_digest_auth_request(nc, opts->auth_domain);
-  } else if (is_cgi) {
-#if MG_ENABLE_HTTP_CGI
-    mg_handle_cgi(nc, index_file ? index_file : path, path_info, hm, opts);
-#else
-    mg_http_send_error(nc, 501, NULL);
-#endif /* MG_ENABLE_HTTP_CGI */
-  } else if ((!exists ||
-              mg_is_file_hidden(path, opts, 0 /* specials are ok */)) &&
-             !mg_is_creation_request(hm)) {
-    mg_http_send_error(nc, 404, NULL);
-#if MG_ENABLE_HTTP_WEBDAV
-  } else if (!mg_vcmp(&hm->method, "PROPFIND")) {
-    mg_handle_propfind(nc, path, &st, hm, opts);
-#if !MG_DISABLE_DAV_AUTH
-  } else if (is_dav &&
-             (opts->dav_auth_file == NULL ||
-              (strcmp(opts->dav_auth_file, "-") != 0 &&
-               !mg_http_is_authorized(
-                   hm, mg_mk_str(path), opts->auth_domain, opts->dav_auth_file,
-                   ((is_directory ? MG_AUTH_FLAG_IS_DIRECTORY : 0) |
-                    MG_AUTH_FLAG_IS_GLOBAL_PASS_FILE |
-                    MG_AUTH_FLAG_ALLOW_MISSING_FILE))))) {
-    mg_http_send_digest_auth_request(nc, opts->auth_domain);
-#endif
-  } else if (!mg_vcmp(&hm->method, "MKCOL")) {
-    mg_handle_mkcol(nc, path, hm);
-  } else if (!mg_vcmp(&hm->method, "DELETE")) {
-    mg_handle_delete(nc, opts, path);
-  } else if (!mg_vcmp(&hm->method, "PUT")) {
-    mg_handle_put(nc, path, hm);
-  } else if (!mg_vcmp(&hm->method, "MOVE")) {
-    mg_handle_move(nc, opts, path, hm);
-#if MG_ENABLE_FAKE_DAVLOCK
-  } else if (!mg_vcmp(&hm->method, "LOCK")) {
-    mg_handle_lock(nc, path);
-#endif
-#endif /* MG_ENABLE_HTTP_WEBDAV */
-  } else if (!mg_vcmp(&hm->method, "OPTIONS")) {
-    mg_http_send_options(nc, opts);
-  } else if (is_directory && index_file == NULL) {
-#if MG_ENABLE_DIRECTORY_LISTING
-    if (strcmp(opts->enable_directory_listing, "yes") == 0) {
-      mg_send_directory_listing(nc, path, hm, opts);
-    } else {
-      mg_http_send_error(nc, 403, NULL);
-    }
-#else
-    mg_http_send_error(nc, 501, NULL);
-#endif
-  } else if (mg_is_not_modified(hm, &st)) {
-    /* Note: not using mg_http_send_error in order to keep connection alive */
-    /* Note: passing extra headers allow users to control session cookies */
-    mg_send_head(nc, 304, 0, opts->extra_headers);
-  } else {
-    mg_http_serve_file2(nc, index_file ? index_file : path, hm, opts);
-  }
-  MG_FREE(index_file);
-}
-
-void mg_serve_http(struct mg_connection *nc, struct http_message *hm,
-                   struct mg_serve_http_opts opts) {
-  char *path = NULL;
-  struct mg_str *hdr, path_info;
-  uint32_t remote_ip = ntohl(*(uint32_t *) &nc->sa.sin.sin_addr);
-
-  if (mg_check_ip_acl(opts.ip_acl, remote_ip) != 1) {
-    /* Not allowed to connect */
-    mg_http_send_error(nc, 403, NULL);
-    nc->flags |= MG_F_SEND_AND_CLOSE;
-    return;
-  }
-
-#if MG_ENABLE_HTTP_URL_REWRITES
-  if (mg_http_handle_forwarding(nc, hm, &opts)) {
-    return;
-  }
-
-  if (mg_http_send_port_based_redirect(nc, hm, &opts)) {
-    return;
-  }
-#endif
-
-  if (opts.document_root == NULL) {
-    opts.document_root = ".";
-  }
-  if (opts.per_directory_auth_file == NULL) {
-    opts.per_directory_auth_file = ".htpasswd";
-  }
-  if (opts.enable_directory_listing == NULL) {
-    opts.enable_directory_listing = "yes";
-  }
-  if (opts.cgi_file_pattern == NULL) {
-    opts.cgi_file_pattern = "**.cgi$|**.php$";
-  }
-  if (opts.ssi_pattern == NULL) {
-    opts.ssi_pattern = "**.shtml$|**.shtm$";
-  }
-  if (opts.index_files == NULL) {
-    opts.index_files = "index.html,index.htm,index.shtml,index.cgi,index.php";
-  }
-  /* Normalize path - resolve "." and ".." (in-place). */
-  if (!mg_normalize_uri_path(&hm->uri, &hm->uri)) {
-    mg_http_send_error(nc, 400, NULL);
-    return;
-  }
-  if (mg_uri_to_local_path(hm, &opts, &path, &path_info) == 0) {
-    mg_http_send_error(nc, 404, NULL);
-    return;
-  }
-  mg_send_http_file(nc, path, &path_info, hm, &opts);
-
-  MG_FREE(path);
-  path = NULL;
-
-  /* Close connection for non-keep-alive requests */
-  if (mg_vcmp(&hm->proto, "HTTP/1.1") != 0 ||
-      ((hdr = mg_get_http_header(hm, "Connection")) != NULL &&
-       mg_vcmp(hdr, "keep-alive") != 0)) {
-#if 0
-    nc->flags |= MG_F_SEND_AND_CLOSE;
-#endif
-  }
-}
-
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-void mg_file_upload_handler(struct mg_connection *nc, int ev, void *ev_data,
-                            mg_fu_fname_fn local_name_fn
-                                MG_UD_ARG(void *user_data)) {
-  switch (ev) {
-    case MG_EV_HTTP_PART_BEGIN: {
-      struct mg_http_multipart_part *mp =
-          (struct mg_http_multipart_part *) ev_data;
-      struct file_upload_state *fus;
-      struct mg_str lfn = local_name_fn(nc, mg_mk_str(mp->file_name));
-      mp->user_data = NULL;
-      if (lfn.p == NULL || lfn.len == 0) {
-        LOG(LL_ERROR, ("%p Not allowed to upload %s", nc, mp->file_name));
-        mg_printf(nc,
-                  "HTTP/1.1 403 Not Allowed\r\n"
-                  "Content-Type: text/plain\r\n"
-                  "Connection: close\r\n\r\n"
-                  "Not allowed to upload %s\r\n",
-                  mp->file_name);
-        nc->flags |= MG_F_SEND_AND_CLOSE;
-        return;
-      }
-      fus = (struct file_upload_state *) MG_CALLOC(1, sizeof(*fus));
-      if (fus == NULL) {
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-        return;
-      }
-      fus->lfn = (char *) MG_MALLOC(lfn.len + 1);
-      memcpy(fus->lfn, lfn.p, lfn.len);
-      fus->lfn[lfn.len] = '\0';
-      if (lfn.p != mp->file_name) MG_FREE((char *) lfn.p);
-      LOG(LL_DEBUG,
-          ("%p Receiving file %s -> %s", nc, mp->file_name, fus->lfn));
-      fus->fp = mg_fopen(fus->lfn, "wb");
-      if (fus->fp == NULL) {
-        mg_printf(nc,
-                  "HTTP/1.1 500 Internal Server Error\r\n"
-                  "Content-Type: text/plain\r\n"
-                  "Connection: close\r\n\r\n");
-        LOG(LL_ERROR, ("Failed to open %s: %d\n", fus->lfn, mg_get_errno()));
-        mg_printf(nc, "Failed to open %s: %d\n", fus->lfn, mg_get_errno());
-        /* Do not close the connection just yet, discard remainder of the data.
-         * This is because at the time of writing some browsers (Chrome) fail to
-         * render response before all the data is sent. */
-      }
-      mp->user_data = (void *) fus;
-      break;
-    }
-    case MG_EV_HTTP_PART_DATA: {
-      struct mg_http_multipart_part *mp =
-          (struct mg_http_multipart_part *) ev_data;
-      struct file_upload_state *fus =
-          (struct file_upload_state *) mp->user_data;
-      if (fus == NULL || fus->fp == NULL) break;
-      if (mg_fwrite(mp->data.p, 1, mp->data.len, fus->fp) != mp->data.len) {
-        LOG(LL_ERROR, ("Failed to write to %s: %d, wrote %d", fus->lfn,
-                       mg_get_errno(), (int) fus->num_recd));
-        if (mg_get_errno() == ENOSPC
-#ifdef SPIFFS_ERR_FULL
-            || mg_get_errno() == SPIFFS_ERR_FULL
-#endif
-        ) {
-          mg_printf(nc,
-                    "HTTP/1.1 413 Payload Too Large\r\n"
-                    "Content-Type: text/plain\r\n"
-                    "Connection: close\r\n\r\n");
-          mg_printf(nc, "Failed to write to %s: no space left; wrote %d\r\n",
-                    fus->lfn, (int) fus->num_recd);
-        } else {
-          mg_printf(nc,
-                    "HTTP/1.1 500 Internal Server Error\r\n"
-                    "Content-Type: text/plain\r\n"
-                    "Connection: close\r\n\r\n");
-          mg_printf(nc, "Failed to write to %s: %d, wrote %d", mp->file_name,
-                    mg_get_errno(), (int) fus->num_recd);
-        }
-        fclose(fus->fp);
-        remove(fus->lfn);
-        fus->fp = NULL;
-        /* Do not close the connection just yet, discard remainder of the data.
-         * This is because at the time of writing some browsers (Chrome) fail to
-         * render response before all the data is sent. */
-        return;
-      }
-      fus->num_recd += mp->data.len;
-      LOG(LL_DEBUG, ("%p rec'd %d bytes, %d total", nc, (int) mp->data.len,
-                     (int) fus->num_recd));
-      break;
-    }
-    case MG_EV_HTTP_PART_END: {
-      struct mg_http_multipart_part *mp =
-          (struct mg_http_multipart_part *) ev_data;
-      struct file_upload_state *fus =
-          (struct file_upload_state *) mp->user_data;
-      if (fus == NULL) break;
-      if (mp->status >= 0 && fus->fp != NULL) {
-        LOG(LL_DEBUG, ("%p Uploaded %s (%s), %d bytes", nc, mp->file_name,
-                       fus->lfn, (int) fus->num_recd));
-      } else {
-        LOG(LL_ERROR, ("Failed to store %s (%s)", mp->file_name, fus->lfn));
-        /*
-         * mp->status < 0 means connection was terminated, so no reason to send
-         * HTTP reply
-         */
-      }
-      if (fus->fp != NULL) fclose(fus->fp);
-      MG_FREE(fus->lfn);
-      MG_FREE(fus);
-      mp->user_data = NULL;
-      /* Don't close the connection yet, there may be more files to come. */
-      break;
-    }
-    case MG_EV_HTTP_MULTIPART_REQUEST_END: {
-      mg_printf(nc,
-                "HTTP/1.1 200 OK\r\n"
-                "Content-Type: text/plain\r\n"
-                "Connection: close\r\n\r\n"
-                "Ok.\r\n");
-      nc->flags |= MG_F_SEND_AND_CLOSE;
-      break;
-    }
-  }
-
-#if MG_ENABLE_CALLBACK_USERDATA
-  (void) user_data;
-#endif
-}
-
-#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
-#endif /* MG_ENABLE_FILESYSTEM */
-
-struct mg_connection *mg_connect_http_base(
-    struct mg_mgr *mgr, MG_CB(mg_event_handler_t ev_handler, void *user_data),
-    struct mg_connect_opts opts, const char *scheme1, const char *scheme2,
-    const char *scheme_ssl1, const char *scheme_ssl2, const char *url,
-    struct mg_str *path, struct mg_str *user_info, struct mg_str *host) {
-  struct mg_connection *nc = NULL;
-  unsigned int port_i = 0;
-  int use_ssl = 0;
-  struct mg_str scheme, query, fragment;
-  char conn_addr_buf[2];
-  char *conn_addr = conn_addr_buf;
-
-  if (mg_parse_uri(mg_mk_str(url), &scheme, user_info, host, &port_i, path,
-                   &query, &fragment) != 0) {
-    MG_SET_PTRPTR(opts.error_string, "cannot parse url");
-    goto out;
-  }
-
-  /* If query is present, do not strip it. Pass to the caller. */
-  if (query.len > 0) path->len += query.len + 1;
-
-  if (scheme.len == 0 || mg_vcmp(&scheme, scheme1) == 0 ||
-      (scheme2 != NULL && mg_vcmp(&scheme, scheme2) == 0)) {
-    use_ssl = 0;
-    if (port_i == 0) port_i = 80;
-  } else if (mg_vcmp(&scheme, scheme_ssl1) == 0 ||
-             (scheme2 != NULL && mg_vcmp(&scheme, scheme_ssl2) == 0)) {
-    use_ssl = 1;
-    if (port_i == 0) port_i = 443;
-  } else {
-    goto out;
-  }
-
-  mg_asprintf(&conn_addr, sizeof(conn_addr_buf), "tcp://%.*s:%u",
-              (int) host->len, host->p, port_i);
-  if (conn_addr == NULL) goto out;
-
-  LOG(LL_DEBUG, ("%s use_ssl? %d %s", url, use_ssl, conn_addr));
-  if (use_ssl) {
-#if MG_ENABLE_SSL
-    /*
-     * Schema requires SSL, but no SSL parameters were provided in opts.
-     * In order to maintain backward compatibility, use a faux-SSL with no
-     * verification.
-     */
-    if (opts.ssl_ca_cert == NULL) {
-      opts.ssl_ca_cert = "*";
-    }
-#else
-    MG_SET_PTRPTR(opts.error_string, "ssl is disabled");
-    goto out;
-#endif
-  }
-
-  if ((nc = mg_connect_opt(mgr, conn_addr, MG_CB(ev_handler, user_data),
-                           opts)) != NULL) {
-    mg_set_protocol_http_websocket(nc);
-  }
-
-out:
-  if (conn_addr != NULL && conn_addr != conn_addr_buf) MG_FREE(conn_addr);
-  return nc;
-}
-
-struct mg_connection *mg_connect_http_opt(
-    struct mg_mgr *mgr, MG_CB(mg_event_handler_t ev_handler, void *user_data),
-    struct mg_connect_opts opts, const char *url, const char *extra_headers,
-    const char *post_data) {
-  struct mg_str user = MG_NULL_STR, null_str = MG_NULL_STR;
-  struct mg_str host = MG_NULL_STR, path = MG_NULL_STR;
-  struct mbuf auth;
-  struct mg_connection *nc =
-      mg_connect_http_base(mgr, MG_CB(ev_handler, user_data), opts, "http",
-                           NULL, "https", NULL, url, &path, &user, &host);
-
-  if (nc == NULL) {
-    return NULL;
-  }
-
-  mbuf_init(&auth, 0);
-  if (user.len > 0) {
-    mg_basic_auth_header(user, null_str, &auth);
-  }
-
-  if (post_data == NULL) post_data = "";
-  if (extra_headers == NULL) extra_headers = "";
-  if (path.len == 0) path = mg_mk_str("/");
-  if (host.len == 0) host = mg_mk_str("");
-
-  mg_printf(nc,
-            "%s %.*s HTTP/1.1\r\nHost: %.*s\r\nContent-Length: %" SIZE_T_FMT
-            "\r\n%.*s%s\r\n%s",
-            (post_data[0] == '\0' ? "GET" : "POST"), (int) path.len, path.p,
-            (int) (path.p - host.p), host.p, strlen(post_data), (int) auth.len,
-            (auth.buf == NULL ? "" : auth.buf), extra_headers, post_data);
-
-  mbuf_free(&auth);
-  return nc;
-}
-
-struct mg_connection *mg_connect_http(
-    struct mg_mgr *mgr, MG_CB(mg_event_handler_t ev_handler, void *user_data),
-    const char *url, const char *extra_headers, const char *post_data) {
-  struct mg_connect_opts opts;
-  memset(&opts, 0, sizeof(opts));
-  return mg_connect_http_opt(mgr, MG_CB(ev_handler, user_data), opts, url,
-                             extra_headers, post_data);
-}
-
-size_t mg_parse_multipart(const char *buf, size_t buf_len, char *var_name,
-                          size_t var_name_len, char *file_name,
-                          size_t file_name_len, const char **data,
-                          size_t *data_len) {
-  static const char cd[] = "Content-Disposition: ";
-  size_t hl, bl, n, ll, pos, cdl = sizeof(cd) - 1;
-  int shl;
-
-  if (buf == NULL || buf_len <= 0) return 0;
-  if ((shl = mg_http_get_request_len(buf, buf_len)) <= 0) return 0;
-  hl = shl;
-  if (buf[0] != '-' || buf[1] != '-' || buf[2] == '\n') return 0;
-
-  /* Get boundary length */
-  bl = mg_get_line_len(buf, buf_len);
-
-  /* Loop through headers, fetch variable name and file name */
-  var_name[0] = file_name[0] = '\0';
-  for (n = bl; (ll = mg_get_line_len(buf + n, hl - n)) > 0; n += ll) {
-    if (mg_ncasecmp(cd, buf + n, cdl) == 0) {
-      struct mg_str header;
-      header.p = buf + n + cdl;
-      header.len = ll - (cdl + 2);
-      {
-        char *var_name2 = var_name;
-        mg_http_parse_header2(&header, "name", &var_name2, var_name_len);
-        /* TODO: handle reallocated buffer correctly */
-        if (var_name2 != var_name) {
-          MG_FREE(var_name2);
-          var_name[0] = '\0';
-        }
-      }
-      {
-        char *file_name2 = file_name;
-        mg_http_parse_header2(&header, "filename", &file_name2, file_name_len);
-        /* TODO: handle reallocated buffer correctly */
-        if (file_name2 != file_name) {
-          MG_FREE(file_name2);
-          file_name[0] = '\0';
-        }
-      }
-    }
-  }
-
-  /* Scan through the body, search for terminating boundary */
-  for (pos = hl; pos + (bl - 2) < buf_len; pos++) {
-    if (buf[pos] == '-' && !strncmp(buf, &buf[pos], bl - 2)) {
-      if (data_len != NULL) *data_len = (pos - 2) - hl;
-      if (data != NULL) *data = buf + hl;
-      return pos;
-    }
-  }
-
-  return 0;
-}
-
-void mg_register_http_endpoint_opt(struct mg_connection *nc,
-                                   const char *uri_path,
-                                   mg_event_handler_t handler,
-                                   struct mg_http_endpoint_opts opts) {
-  struct mg_http_proto_data *pd = NULL;
-  struct mg_http_endpoint *new_ep = NULL;
-
-  if (nc == NULL) return;
-  new_ep = (struct mg_http_endpoint *) MG_CALLOC(1, sizeof(*new_ep));
-  if (new_ep == NULL) return;
-
-  pd = mg_http_get_proto_data(nc);
-  if (pd == NULL) pd = mg_http_create_proto_data(nc);
-  new_ep->uri_pattern = mg_strdup(mg_mk_str(uri_path));
-  if (opts.auth_domain != NULL && opts.auth_file != NULL) {
-    new_ep->auth_domain = strdup(opts.auth_domain);
-    new_ep->auth_file = strdup(opts.auth_file);
-  }
-  new_ep->handler = handler;
-#if MG_ENABLE_CALLBACK_USERDATA
-  new_ep->user_data = opts.user_data;
-#endif
-  new_ep->next = pd->endpoints;
-  pd->endpoints = new_ep;
-}
-
-static void mg_http_call_endpoint_handler(struct mg_connection *nc, int ev,
-                                          struct http_message *hm) {
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
-  void *user_data = nc->user_data;
-
-  if (ev == MG_EV_HTTP_REQUEST
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-      || ev == MG_EV_HTTP_MULTIPART_REQUEST
-#endif
-  ) {
-    struct mg_http_endpoint *ep =
-        mg_http_get_endpoint_handler(nc->listener, &hm->uri);
-    if (ep != NULL) {
-#if MG_ENABLE_FILESYSTEM && !MG_DISABLE_HTTP_DIGEST_AUTH
-      if (!mg_http_is_authorized(hm, hm->uri, ep->auth_domain, ep->auth_file,
-                                 MG_AUTH_FLAG_IS_GLOBAL_PASS_FILE)) {
-        mg_http_send_digest_auth_request(nc, ep->auth_domain);
-        return;
-      }
-#endif
-      pd->endpoint_handler = ep->handler;
-#if MG_ENABLE_CALLBACK_USERDATA
-      user_data = ep->user_data;
-#endif
-    }
-  }
-  mg_call(nc, pd->endpoint_handler ? pd->endpoint_handler : nc->handler,
-          user_data, ev, hm);
-}
-
-void mg_register_http_endpoint(struct mg_connection *nc, const char *uri_path,
-                               MG_CB(mg_event_handler_t handler,
-                                     void *user_data)) {
-  struct mg_http_endpoint_opts opts;
-  memset(&opts, 0, sizeof(opts));
-#if MG_ENABLE_CALLBACK_USERDATA
-  opts.user_data = user_data;
-#endif
-  mg_register_http_endpoint_opt(nc, uri_path, handler, opts);
-}
-
-#endif /* MG_ENABLE_HTTP */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_http_cgi.c"
-#endif
-
-#ifndef _WIN32
-#include <signal.h>
-#endif
-
-#if MG_ENABLE_HTTP && MG_ENABLE_HTTP_CGI
-
-#ifndef MG_MAX_CGI_ENVIR_VARS
-#define MG_MAX_CGI_ENVIR_VARS 64
-#endif
-
-#ifndef MG_ENV_EXPORT_TO_CGI
-#define MG_ENV_EXPORT_TO_CGI "MONGOOSE_CGI"
-#endif
-
-#define MG_F_HTTP_CGI_PARSE_HEADERS MG_F_USER_1
-
-/*
- * This structure helps to create an environment for the spawned CGI program.
- * Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings,
- * last element must be NULL.
- * However, on Windows there is a requirement that all these VARIABLE=VALUE\0
- * strings must reside in a contiguous buffer. The end of the buffer is
- * marked by two '\0' characters.
- * We satisfy both worlds: we create an envp array (which is vars), all
- * entries are actually pointers inside buf.
- */
-struct mg_cgi_env_block {
-  struct mg_connection *nc;
-  char buf[MG_CGI_ENVIRONMENT_SIZE];       /* Environment buffer */
-  const char *vars[MG_MAX_CGI_ENVIR_VARS]; /* char *envp[] */
-  int len;                                 /* Space taken */
-  int nvars;                               /* Number of variables in envp[] */
-};
-
-#ifdef _WIN32
-struct mg_threadparam {
-  sock_t s;
-  HANDLE hPipe;
-};
-
-static int mg_wait_until_ready(sock_t sock, int for_read) {
-  fd_set set;
-  FD_ZERO(&set);
-  FD_SET(sock, &set);
-  return select(sock + 1, for_read ? &set : 0, for_read ? 0 : &set, 0, 0) == 1;
-}
-
-static void *mg_push_to_stdin(void *arg) {
-  struct mg_threadparam *tp = (struct mg_threadparam *) arg;
-  int n, sent, stop = 0;
-  DWORD k;
-  char buf[BUFSIZ];
-
-  while (!stop && mg_wait_until_ready(tp->s, 1) &&
-         (n = recv(tp->s, buf, sizeof(buf), 0)) > 0) {
-    if (n == -1 && GetLastError() == WSAEWOULDBLOCK) continue;
-    for (sent = 0; !stop && sent < n; sent += k) {
-      if (!WriteFile(tp->hPipe, buf + sent, n - sent, &k, 0)) stop = 1;
-    }
-  }
-  DBG(("%s", "FORWARED EVERYTHING TO CGI"));
-  CloseHandle(tp->hPipe);
-  MG_FREE(tp);
-  return NULL;
-}
-
-static void *mg_pull_from_stdout(void *arg) {
-  struct mg_threadparam *tp = (struct mg_threadparam *) arg;
-  int k = 0, stop = 0;
-  DWORD n, sent;
-  char buf[BUFSIZ];
-
-  while (!stop && ReadFile(tp->hPipe, buf, sizeof(buf), &n, NULL)) {
-    for (sent = 0; !stop && sent < n; sent += k) {
-      if (mg_wait_until_ready(tp->s, 0) &&
-          (k = send(tp->s, buf + sent, n - sent, 0)) <= 0)
-        stop = 1;
-    }
-  }
-  DBG(("%s", "EOF FROM CGI"));
-  CloseHandle(tp->hPipe);
-  shutdown(tp->s, 2);  // Without this, IO thread may get truncated data
-  closesocket(tp->s);
-  MG_FREE(tp);
-  return NULL;
-}
-
-static void mg_spawn_stdio_thread(sock_t sock, HANDLE hPipe,
-                                  void *(*func)(void *)) {
-  struct mg_threadparam *tp = (struct mg_threadparam *) MG_MALLOC(sizeof(*tp));
-  if (tp != NULL) {
-    tp->s = sock;
-    tp->hPipe = hPipe;
-    mg_start_thread(func, tp);
-  }
-}
-
-static void mg_abs_path(const char *utf8_path, char *abs_path, size_t len) {
-  wchar_t buf[MG_MAX_PATH], buf2[MG_MAX_PATH];
-  to_wchar(utf8_path, buf, ARRAY_SIZE(buf));
-  GetFullPathNameW(buf, ARRAY_SIZE(buf2), buf2, NULL);
-  WideCharToMultiByte(CP_UTF8, 0, buf2, wcslen(buf2) + 1, abs_path, len, 0, 0);
-}
-
-static int mg_start_process(const char *interp, const char *cmd,
-                            const char *env, const char *envp[],
-                            const char *dir, sock_t sock) {
-  STARTUPINFOW si;
-  PROCESS_INFORMATION pi;
-  HANDLE a[2], b[2], me = GetCurrentProcess();
-  wchar_t wcmd[MG_MAX_PATH], full_dir[MG_MAX_PATH];
-  char buf[MG_MAX_PATH], buf2[MG_MAX_PATH], buf5[MG_MAX_PATH],
-      buf4[MG_MAX_PATH], cmdline[MG_MAX_PATH];
-  DWORD flags = DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS;
-  FILE *fp;
-
-  memset(&si, 0, sizeof(si));
-  memset(&pi, 0, sizeof(pi));
-
-  si.cb = sizeof(si);
-  si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
-  si.wShowWindow = SW_HIDE;
-  si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
-
-  CreatePipe(&a[0], &a[1], NULL, 0);
-  CreatePipe(&b[0], &b[1], NULL, 0);
-  DuplicateHandle(me, a[0], me, &si.hStdInput, 0, TRUE, flags);
-  DuplicateHandle(me, b[1], me, &si.hStdOutput, 0, TRUE, flags);
-
-  if (interp == NULL && (fp = mg_fopen(cmd, "r")) != NULL) {
-    buf[0] = buf[1] = '\0';
-    fgets(buf, sizeof(buf), fp);
-    buf[sizeof(buf) - 1] = '\0';
-    if (buf[0] == '#' && buf[1] == '!') {
-      interp = buf + 2;
-      /* Trim leading spaces: https://github.com/cesanta/mongoose/issues/489 */
-      while (*interp != '\0' && isspace(*(unsigned char *) interp)) {
-        interp++;
-      }
-    }
-    fclose(fp);
-  }
-
-  snprintf(buf, sizeof(buf), "%s/%s", dir, cmd);
-  mg_abs_path(buf, buf2, ARRAY_SIZE(buf2));
-
-  mg_abs_path(dir, buf5, ARRAY_SIZE(buf5));
-  to_wchar(dir, full_dir, ARRAY_SIZE(full_dir));
-
-  if (interp != NULL) {
-    mg_abs_path(interp, buf4, ARRAY_SIZE(buf4));
-    snprintf(cmdline, sizeof(cmdline), "%s \"%s\"", buf4, buf2);
-  } else {
-    snprintf(cmdline, sizeof(cmdline), "\"%s\"", buf2);
-  }
-  to_wchar(cmdline, wcmd, ARRAY_SIZE(wcmd));
-
-  if (CreateProcessW(NULL, wcmd, NULL, NULL, TRUE, CREATE_NEW_PROCESS_GROUP,
-                     (void *) env, full_dir, &si, &pi) != 0) {
-    mg_spawn_stdio_thread(sock, a[1], mg_push_to_stdin);
-    mg_spawn_stdio_thread(sock, b[0], mg_pull_from_stdout);
-
-    CloseHandle(si.hStdOutput);
-    CloseHandle(si.hStdInput);
-
-    CloseHandle(pi.hThread);
-    CloseHandle(pi.hProcess);
-  } else {
-    CloseHandle(a[1]);
-    CloseHandle(b[0]);
-    closesocket(sock);
-  }
-  DBG(("CGI command: [%ls] -> %p", wcmd, pi.hProcess));
-
-  /* Not closing a[0] and b[1] because we've used DUPLICATE_CLOSE_SOURCE */
-  (void) envp;
-  return (pi.hProcess != NULL);
-}
-#else
-static int mg_start_process(const char *interp, const char *cmd,
-                            const char *env, const char *envp[],
-                            const char *dir, sock_t sock) {
-  char buf[500];
-  pid_t pid = fork();
-  (void) env;
-
-  if (pid == 0) {
-    /*
-     * In Linux `chdir` declared with `warn_unused_result` attribute
-     * To shutup compiler we have yo use result in some way
-     */
-    int tmp = chdir(dir);
-    (void) tmp;
-    (void) dup2(sock, 0);
-    (void) dup2(sock, 1);
-    closesocket(sock);
-
-    /*
-     * After exec, all signal handlers are restored to their default values,
-     * with one exception of SIGCHLD. According to POSIX.1-2001 and Linux's
-     * implementation, SIGCHLD's handler will leave unchanged after exec
-     * if it was set to be ignored. Restore it to default action.
-     */
-    signal(SIGCHLD, SIG_DFL);
-
-    if (interp == NULL) {
-      execle(cmd, cmd, (char *) 0, envp); /* (char *) 0 to squash warning */
-    } else {
-      execle(interp, interp, cmd, (char *) 0, envp);
-    }
-    snprintf(buf, sizeof(buf),
-             "Status: 500\r\n\r\n"
-             "500 Server Error: %s%s%s: %s",
-             interp == NULL ? "" : interp, interp == NULL ? "" : " ", cmd,
-             strerror(errno));
-    send(1, buf, strlen(buf), 0);
-    _exit(EXIT_FAILURE); /* exec call failed */
-  }
-
-  return (pid != 0);
-}
-#endif /* _WIN32 */
-
-/*
- * Append VARIABLE=VALUE\0 string to the buffer, and add a respective
- * pointer into the vars array.
- */
-static char *mg_addenv(struct mg_cgi_env_block *block, const char *fmt, ...) {
-  int n, space;
-  char *added = block->buf + block->len;
-  va_list ap;
-
-  /* Calculate how much space is left in the buffer */
-  space = sizeof(block->buf) - (block->len + 2);
-  if (space > 0) {
-    /* Copy VARIABLE=VALUE\0 string into the free space */
-    va_start(ap, fmt);
-    n = vsnprintf(added, (size_t) space, fmt, ap);
-    va_end(ap);
-
-    /* Make sure we do not overflow buffer and the envp array */
-    if (n > 0 && n + 1 < space &&
-        block->nvars < (int) ARRAY_SIZE(block->vars) - 2) {
-      /* Append a pointer to the added string into the envp array */
-      block->vars[block->nvars++] = added;
-      /* Bump up used length counter. Include \0 terminator */
-      block->len += n + 1;
-    }
-  }
-
-  return added;
-}
-
-static void mg_addenv2(struct mg_cgi_env_block *blk, const char *name) {
-  const char *s;
-  if ((s = getenv(name)) != NULL) mg_addenv(blk, "%s=%s", name, s);
-}
-
-static void mg_prepare_cgi_environment(struct mg_connection *nc,
-                                       const char *prog,
-                                       const struct mg_str *path_info,
-                                       const struct http_message *hm,
-                                       const struct mg_serve_http_opts *opts,
-                                       struct mg_cgi_env_block *blk) {
-  const char *s;
-  struct mg_str *h;
-  char *p;
-  size_t i;
-  char buf[100];
-  size_t path_info_len = path_info != NULL ? path_info->len : 0;
-
-  blk->len = blk->nvars = 0;
-  blk->nc = nc;
-
-  if ((s = getenv("SERVER_NAME")) != NULL) {
-    mg_addenv(blk, "SERVER_NAME=%s", s);
-  } else {
-    mg_sock_to_str(nc->sock, buf, sizeof(buf), 3);
-    mg_addenv(blk, "SERVER_NAME=%s", buf);
-  }
-  mg_addenv(blk, "SERVER_ROOT=%s", opts->document_root);
-  mg_addenv(blk, "DOCUMENT_ROOT=%s", opts->document_root);
-  mg_addenv(blk, "SERVER_SOFTWARE=%s/%s", "Mongoose", MG_VERSION);
-
-  /* Prepare the environment block */
-  mg_addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1");
-  mg_addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1");
-  mg_addenv(blk, "%s", "REDIRECT_STATUS=200"); /* For PHP */
-
-  mg_addenv(blk, "REQUEST_METHOD=%.*s", (int) hm->method.len, hm->method.p);
-
-  mg_addenv(blk, "REQUEST_URI=%.*s%s%.*s", (int) hm->uri.len, hm->uri.p,
-            hm->query_string.len == 0 ? "" : "?", (int) hm->query_string.len,
-            hm->query_string.p);
-
-  mg_conn_addr_to_str(nc, buf, sizeof(buf),
-                      MG_SOCK_STRINGIFY_REMOTE | MG_SOCK_STRINGIFY_IP);
-  mg_addenv(blk, "REMOTE_ADDR=%s", buf);
-  mg_conn_addr_to_str(nc, buf, sizeof(buf), MG_SOCK_STRINGIFY_PORT);
-  mg_addenv(blk, "SERVER_PORT=%s", buf);
-
-  s = hm->uri.p + hm->uri.len - path_info_len - 1;
-  if (*s == '/') {
-    const char *base_name = strrchr(prog, DIRSEP);
-    mg_addenv(blk, "SCRIPT_NAME=%.*s/%s", (int) (s - hm->uri.p), hm->uri.p,
-              (base_name != NULL ? base_name + 1 : prog));
-  } else {
-    mg_addenv(blk, "SCRIPT_NAME=%.*s", (int) (s - hm->uri.p + 1), hm->uri.p);
-  }
-  mg_addenv(blk, "SCRIPT_FILENAME=%s", prog);
-
-  if (path_info != NULL && path_info->len > 0) {
-    mg_addenv(blk, "PATH_INFO=%.*s", (int) path_info->len, path_info->p);
-    /* Not really translated... */
-    mg_addenv(blk, "PATH_TRANSLATED=%.*s", (int) path_info->len, path_info->p);
-  }
-
-#if MG_ENABLE_SSL
-  mg_addenv(blk, "HTTPS=%s", (nc->flags & MG_F_SSL ? "on" : "off"));
-#else
-  mg_addenv(blk, "HTTPS=off");
-#endif
-
-  if ((h = mg_get_http_header((struct http_message *) hm, "Content-Type")) !=
-      NULL) {
-    mg_addenv(blk, "CONTENT_TYPE=%.*s", (int) h->len, h->p);
-  }
-
-  if (hm->query_string.len > 0) {
-    mg_addenv(blk, "QUERY_STRING=%.*s", (int) hm->query_string.len,
-              hm->query_string.p);
-  }
-
-  if ((h = mg_get_http_header((struct http_message *) hm, "Content-Length")) !=
-      NULL) {
-    mg_addenv(blk, "CONTENT_LENGTH=%.*s", (int) h->len, h->p);
-  }
-
-  mg_addenv2(blk, "PATH");
-  mg_addenv2(blk, "TMP");
-  mg_addenv2(blk, "TEMP");
-  mg_addenv2(blk, "TMPDIR");
-  mg_addenv2(blk, "PERLLIB");
-  mg_addenv2(blk, MG_ENV_EXPORT_TO_CGI);
-
-#ifdef _WIN32
-  mg_addenv2(blk, "COMSPEC");
-  mg_addenv2(blk, "SYSTEMROOT");
-  mg_addenv2(blk, "SystemDrive");
-  mg_addenv2(blk, "ProgramFiles");
-  mg_addenv2(blk, "ProgramFiles(x86)");
-  mg_addenv2(blk, "CommonProgramFiles(x86)");
-#else
-  mg_addenv2(blk, "LD_LIBRARY_PATH");
-#endif /* _WIN32 */
-
-  /* Add all headers as HTTP_* variables */
-  for (i = 0; hm->header_names[i].len > 0; i++) {
-    p = mg_addenv(blk, "HTTP_%.*s=%.*s", (int) hm->header_names[i].len,
-                  hm->header_names[i].p, (int) hm->header_values[i].len,
-                  hm->header_values[i].p);
-
-    /* Convert variable name into uppercase, and change - to _ */
-    for (; *p != '=' && *p != '\0'; p++) {
-      if (*p == '-') *p = '_';
-      *p = (char) toupper(*(unsigned char *) p);
-    }
-  }
-
-  blk->vars[blk->nvars++] = NULL;
-  blk->buf[blk->len++] = '\0';
-}
-
-static void mg_cgi_ev_handler(struct mg_connection *cgi_nc, int ev,
-                              void *ev_data MG_UD_ARG(void *user_data)) {
-#if !MG_ENABLE_CALLBACK_USERDATA
-  void *user_data = cgi_nc->user_data;
-#endif
-  struct mg_connection *nc = (struct mg_connection *) user_data;
-  (void) ev_data;
-
-  if (nc == NULL) {
-    /* The corresponding network connection was closed. */
-    cgi_nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-    return;
-  }
-
-  switch (ev) {
-    case MG_EV_RECV:
-      /*
-       * CGI script does not output reply line, like "HTTP/1.1 CODE XXXXX\n"
-       * It outputs headers, then body. Headers might include "Status"
-       * header, which changes CODE, and it might include "Location" header
-       * which changes CODE to 302.
-       *
-       * Therefore we do not send the output from the CGI script to the user
-       * until all CGI headers are received.
-       *
-       * Here we parse the output from the CGI script, and if all headers has
-       * been received, send appropriate reply line, and forward all
-       * received headers to the client.
-       */
-      if (nc->flags & MG_F_HTTP_CGI_PARSE_HEADERS) {
-        struct mbuf *io = &cgi_nc->recv_mbuf;
-        int len = mg_http_get_request_len(io->buf, io->len);
-
-        if (len == 0) break;
-        if (len < 0 || io->len > MG_MAX_HTTP_REQUEST_SIZE) {
-          cgi_nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-          mg_http_send_error(nc, 500, "Bad headers");
-        } else {
-          struct http_message hm;
-          struct mg_str *h;
-          mg_http_parse_headers(io->buf, io->buf + io->len, io->len, &hm);
-          if (mg_get_http_header(&hm, "Location") != NULL) {
-            mg_printf(nc, "%s", "HTTP/1.1 302 Moved\r\n");
-          } else if ((h = mg_get_http_header(&hm, "Status")) != NULL) {
-            mg_printf(nc, "HTTP/1.1 %.*s\r\n", (int) h->len, h->p);
-          } else {
-            mg_printf(nc, "%s", "HTTP/1.1 200 OK\r\n");
-          }
-        }
-        nc->flags &= ~MG_F_HTTP_CGI_PARSE_HEADERS;
-      }
-      if (!(nc->flags & MG_F_HTTP_CGI_PARSE_HEADERS)) {
-        mg_forward(cgi_nc, nc);
-      }
-      break;
-    case MG_EV_CLOSE:
-      DBG(("%p CLOSE", cgi_nc));
-      mg_http_free_proto_data_cgi(&mg_http_get_proto_data(nc)->cgi);
-      nc->flags |= MG_F_SEND_AND_CLOSE;
-      break;
-  }
-}
-
-MG_INTERNAL void mg_handle_cgi(struct mg_connection *nc, const char *prog,
-                               const struct mg_str *path_info,
-                               const struct http_message *hm,
-                               const struct mg_serve_http_opts *opts) {
-  struct mg_cgi_env_block blk;
-  char dir[MG_MAX_PATH];
-  const char *p;
-  sock_t fds[2];
-
-  DBG(("%p [%s]", nc, prog));
-  mg_prepare_cgi_environment(nc, prog, path_info, hm, opts, &blk);
-  /*
-   * CGI must be executed in its own directory. 'dir' must point to the
-   * directory containing executable program, 'p' must point to the
-   * executable program name relative to 'dir'.
-   */
-  if ((p = strrchr(prog, DIRSEP)) == NULL) {
-    snprintf(dir, sizeof(dir), "%s", ".");
-  } else {
-    snprintf(dir, sizeof(dir), "%.*s", (int) (p - prog), prog);
-    prog = p + 1;
-  }
-
-  if (!mg_socketpair(fds, SOCK_STREAM)) {
-    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-    return;
-  }
-
-#ifndef _WIN32
-  struct sigaction sa;
-
-  sigemptyset(&sa.sa_mask);
-  sa.sa_handler = SIG_IGN;
-  sa.sa_flags = 0;
-  sigaction(SIGCHLD, &sa, NULL);
-#endif
-
-  if (mg_start_process(opts->cgi_interpreter, prog, blk.buf, blk.vars, dir,
-                       fds[1]) != 0) {
-    struct mg_connection *cgi_nc =
-        mg_add_sock(nc->mgr, fds[0], mg_cgi_ev_handler MG_UD_ARG(nc));
-    struct mg_http_proto_data *cgi_pd = mg_http_get_proto_data(nc);
-    cgi_pd->cgi.cgi_nc = cgi_nc;
-#if !MG_ENABLE_CALLBACK_USERDATA
-    cgi_pd->cgi.cgi_nc->user_data = nc;
-#endif
-    nc->flags |= MG_F_HTTP_CGI_PARSE_HEADERS;
-    /* Push POST data to the CGI */
-    if (hm->body.len > 0) {
-      mg_send(cgi_pd->cgi.cgi_nc, hm->body.p, hm->body.len);
-    }
-    mbuf_remove(&nc->recv_mbuf, nc->recv_mbuf.len);
-  } else {
-    closesocket(fds[0]);
-    mg_http_send_error(nc, 500, "CGI failure");
-  }
-
-#ifndef _WIN32
-  closesocket(fds[1]); /* On Windows, CGI stdio thread closes that socket */
-#endif
-}
-
-MG_INTERNAL void mg_http_free_proto_data_cgi(struct mg_http_proto_data_cgi *d) {
-  if (d == NULL) return;
-  if (d->cgi_nc != NULL) {
-    d->cgi_nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-    d->cgi_nc->user_data = NULL;
-  }
-  memset(d, 0, sizeof(*d));
-}
-
-#endif /* MG_ENABLE_HTTP && MG_ENABLE_HTTP_CGI */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_http_ssi.c"
-#endif
-
-#if MG_ENABLE_HTTP && MG_ENABLE_HTTP_SSI && MG_ENABLE_FILESYSTEM
-
-static void mg_send_ssi_file(struct mg_connection *nc, struct http_message *hm,
-                             const char *path, FILE *fp, int include_level,
-                             const struct mg_serve_http_opts *opts);
-
-static void mg_send_file_data(struct mg_connection *nc, FILE *fp) {
-  char buf[BUFSIZ];
-  size_t n;
-  while ((n = mg_fread(buf, 1, sizeof(buf), fp)) > 0) {
-    mg_send(nc, buf, n);
-  }
-}
-
-static void mg_do_ssi_include(struct mg_connection *nc, struct http_message *hm,
-                              const char *ssi, char *tag, int include_level,
-                              const struct mg_serve_http_opts *opts) {
-  char file_name[MG_MAX_PATH], path[MG_MAX_PATH], *p;
-  FILE *fp;
-
-  /*
-   * sscanf() is safe here, since send_ssi_file() also uses buffer
-   * of size MG_BUF_LEN to get the tag. So strlen(tag) is always < MG_BUF_LEN.
-   */
-  if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) {
-    /* File name is relative to the webserver root */
-    snprintf(path, sizeof(path), "%s/%s", opts->document_root, file_name);
-  } else if (sscanf(tag, " abspath=\"%[^\"]\"", file_name) == 1) {
-    /*
-     * File name is relative to the webserver working directory
-     * or it is absolute system path
-     */
-    snprintf(path, sizeof(path), "%s", file_name);
-  } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1 ||
-             sscanf(tag, " \"%[^\"]\"", file_name) == 1) {
-    /* File name is relative to the currect document */
-    snprintf(path, sizeof(path), "%s", ssi);
-    if ((p = strrchr(path, DIRSEP)) != NULL) {
-      p[1] = '\0';
-    }
-    snprintf(path + strlen(path), sizeof(path) - strlen(path), "%s", file_name);
-  } else {
-    mg_printf(nc, "Bad SSI #include: [%s]", tag);
-    return;
-  }
-
-  if ((fp = mg_fopen(path, "rb")) == NULL) {
-    mg_printf(nc, "SSI include error: mg_fopen(%s): %s", path,
-              strerror(mg_get_errno()));
-  } else {
-    mg_set_close_on_exec((sock_t) fileno(fp));
-    if (mg_match_prefix(opts->ssi_pattern, strlen(opts->ssi_pattern), path) >
-        0) {
-      mg_send_ssi_file(nc, hm, path, fp, include_level + 1, opts);
-    } else {
-      mg_send_file_data(nc, fp);
-    }
-    fclose(fp);
-  }
-}
-
-#if MG_ENABLE_HTTP_SSI_EXEC
-static void do_ssi_exec(struct mg_connection *nc, char *tag) {
-  char cmd[BUFSIZ];
-  FILE *fp;
-
-  if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) {
-    mg_printf(nc, "Bad SSI #exec: [%s]", tag);
-  } else if ((fp = popen(cmd, "r")) == NULL) {
-    mg_printf(nc, "Cannot SSI #exec: [%s]: %s", cmd, strerror(mg_get_errno()));
-  } else {
-    mg_send_file_data(nc, fp);
-    pclose(fp);
-  }
-}
-#endif /* MG_ENABLE_HTTP_SSI_EXEC */
-
-/*
- * SSI directive has the following format:
- * <!--#directive parameter=value parameter=value -->
- */
-static void mg_send_ssi_file(struct mg_connection *nc, struct http_message *hm,
-                             const char *path, FILE *fp, int include_level,
-                             const struct mg_serve_http_opts *opts) {
-  static const struct mg_str btag = MG_MK_STR("<!--#");
-  static const struct mg_str d_include = MG_MK_STR("include");
-  static const struct mg_str d_call = MG_MK_STR("call");
-#if MG_ENABLE_HTTP_SSI_EXEC
-  static const struct mg_str d_exec = MG_MK_STR("exec");
-#endif
-  char buf[BUFSIZ], *p = buf + btag.len; /* p points to SSI directive */
-  int ch, len, in_ssi_tag;
-
-  if (include_level > 10) {
-    mg_printf(nc, "SSI #include level is too deep (%s)", path);
-    return;
-  }
-
-  in_ssi_tag = len = 0;
-  while ((ch = fgetc(fp)) != EOF) {
-    if (in_ssi_tag && ch == '>' && buf[len - 1] == '-' && buf[len - 2] == '-') {
-      size_t i = len - 2;
-      in_ssi_tag = 0;
-
-      /* Trim closing --> */
-      buf[i--] = '\0';
-      while (i > 0 && buf[i] == ' ') {
-        buf[i--] = '\0';
-      }
-
-      /* Handle known SSI directives */
-      if (strncmp(p, d_include.p, d_include.len) == 0) {
-        mg_do_ssi_include(nc, hm, path, p + d_include.len + 1, include_level,
-                          opts);
-      } else if (strncmp(p, d_call.p, d_call.len) == 0) {
-        struct mg_ssi_call_ctx cctx;
-        memset(&cctx, 0, sizeof(cctx));
-        cctx.req = hm;
-        cctx.file = mg_mk_str(path);
-        cctx.arg = mg_mk_str(p + d_call.len + 1);
-        mg_call(nc, NULL, nc->user_data, MG_EV_SSI_CALL,
-                (void *) cctx.arg.p); /* NUL added above */
-        mg_call(nc, NULL, nc->user_data, MG_EV_SSI_CALL_CTX, &cctx);
-#if MG_ENABLE_HTTP_SSI_EXEC
-      } else if (strncmp(p, d_exec.p, d_exec.len) == 0) {
-        do_ssi_exec(nc, p + d_exec.len + 1);
-#endif
-      } else {
-        /* Silently ignore unknown SSI directive. */
-      }
-      len = 0;
-    } else if (ch == '<') {
-      in_ssi_tag = 1;
-      if (len > 0) {
-        mg_send(nc, buf, (size_t) len);
-      }
-      len = 0;
-      buf[len++] = ch & 0xff;
-    } else if (in_ssi_tag) {
-      if (len == (int) btag.len && strncmp(buf, btag.p, btag.len) != 0) {
-        /* Not an SSI tag */
-        in_ssi_tag = 0;
-      } else if (len == (int) sizeof(buf) - 2) {
-        mg_printf(nc, "%s: SSI tag is too large", path);
-        len = 0;
-      }
-      buf[len++] = ch & 0xff;
-    } else {
-      buf[len++] = ch & 0xff;
-      if (len == (int) sizeof(buf)) {
-        mg_send(nc, buf, (size_t) len);
-        len = 0;
-      }
-    }
-  }
-
-  /* Send the rest of buffered data */
-  if (len > 0) {
-    mg_send(nc, buf, (size_t) len);
-  }
-}
-
-MG_INTERNAL void mg_handle_ssi_request(struct mg_connection *nc,
-                                       struct http_message *hm,
-                                       const char *path,
-                                       const struct mg_serve_http_opts *opts) {
-  FILE *fp;
-  struct mg_str mime_type = MG_NULL_STR, encoding = MG_NULL_STR;
-  DBG(("%p %s", nc, path));
-
-  if ((fp = mg_fopen(path, "rb")) == NULL) {
-    mg_http_send_error(nc, 404, NULL);
-  } else {
-    mg_set_close_on_exec((sock_t) fileno(fp));
-
-    if (!mg_get_mime_type_encoding(mg_mk_str(path), &mime_type, &encoding,
-                                   opts)) {
-      mime_type = mg_mk_str("text/plain");
-    }
-    mg_send_response_line(nc, 200, opts->extra_headers);
-    mg_printf(nc,
-              "Content-Type: %.*s\r\n"
-              "Connection: close\r\n",
-              (int) mime_type.len, mime_type.p);
-    if (encoding.len > 0) {
-      mg_printf(nc, "Content-Encoding: %.*s\r\n", (int) encoding.len,
-                encoding.p);
-    }
-    mg_send(nc, "\r\n", 2);
-    mg_send_ssi_file(nc, hm, path, fp, 0, opts);
-    fclose(fp);
-    nc->flags |= MG_F_SEND_AND_CLOSE;
-  }
-}
-
-#endif /* MG_ENABLE_HTTP_SSI && MG_ENABLE_HTTP && MG_ENABLE_FILESYSTEM */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_http_webdav.c"
-#endif
-
-#if MG_ENABLE_HTTP && MG_ENABLE_HTTP_WEBDAV
-
-MG_INTERNAL int mg_is_dav_request(const struct mg_str *s) {
-  static const char *methods[] = {
-    "PUT",
-    "DELETE",
-    "MKCOL",
-    "PROPFIND",
-    "MOVE"
-#if MG_ENABLE_FAKE_DAVLOCK
-    ,
-    "LOCK",
-    "UNLOCK"
-#endif
-  };
-  size_t i;
-
-  for (i = 0; i < ARRAY_SIZE(methods); i++) {
-    if (mg_vcmp(s, methods[i]) == 0) {
-      return 1;
-    }
-  }
-
-  return 0;
-}
-
-static int mg_mkdir(const char *path, uint32_t mode) {
-#ifndef _WIN32
-  return mkdir(path, mode);
-#else
-  (void) mode;
-  return _mkdir(path);
-#endif
-}
-
-static void mg_print_props(struct mg_connection *nc, const char *name,
-                           cs_stat_t *stp) {
-  char mtime[64];
-  time_t t = stp->st_mtime; /* store in local variable for NDK compile */
-  struct mg_str name_esc = mg_url_encode(mg_mk_str(name));
-  mg_gmt_time_string(mtime, sizeof(mtime), &t);
-  mg_printf(nc,
-            "<d:response>"
-            "<d:href>%s</d:href>"
-            "<d:propstat>"
-            "<d:prop>"
-            "<d:resourcetype>%s</d:resourcetype>"
-            "<d:getcontentlength>%" INT64_FMT
-            "</d:getcontentlength>"
-            "<d:getlastmodified>%s</d:getlastmodified>"
-            "</d:prop>"
-            "<d:status>HTTP/1.1 200 OK</d:status>"
-            "</d:propstat>"
-            "</d:response>\n",
-            name_esc.p, S_ISDIR(stp->st_mode) ? "<d:collection/>" : "",
-            (int64_t) stp->st_size, mtime);
-  free((void *) name_esc.p);
-}
-
-MG_INTERNAL void mg_handle_propfind(struct mg_connection *nc, const char *path,
-                                    cs_stat_t *stp, struct http_message *hm,
-                                    struct mg_serve_http_opts *opts) {
-  static const char header[] =
-      "HTTP/1.1 207 Multi-Status\r\n"
-      "Connection: close\r\n"
-      "Content-Type: text/xml; charset=utf-8\r\n\r\n"
-      "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
-      "<d:multistatus xmlns:d='DAV:'>\n";
-  static const char footer[] = "</d:multistatus>\n";
-  const struct mg_str *depth = mg_get_http_header(hm, "Depth");
-
-  /* Print properties for the requested resource itself */
-  if (S_ISDIR(stp->st_mode) &&
-      strcmp(opts->enable_directory_listing, "yes") != 0) {
-    mg_printf(nc, "%s", "HTTP/1.1 403 Directory Listing Denied\r\n\r\n");
-  } else {
-    char uri[MG_MAX_PATH];
-    mg_send(nc, header, sizeof(header) - 1);
-    snprintf(uri, sizeof(uri), "%.*s", (int) hm->uri.len, hm->uri.p);
-    mg_print_props(nc, uri, stp);
-    if (S_ISDIR(stp->st_mode) && (depth == NULL || mg_vcmp(depth, "0") != 0)) {
-      mg_scan_directory(nc, path, opts, mg_print_props);
-    }
-    mg_send(nc, footer, sizeof(footer) - 1);
-    nc->flags |= MG_F_SEND_AND_CLOSE;
-  }
-}
-
-#if MG_ENABLE_FAKE_DAVLOCK
-/*
- * Windows explorer (probably there are another WebDav clients like it)
- * requires LOCK support in webdav. W/out this, it still works, but fails
- * to save file: shows error message and offers "Save As".
- * "Save as" works, but this message is very annoying.
- * This is fake lock, which doesn't lock something, just returns LOCK token,
- * UNLOCK always answers "OK".
- * With this fake LOCK Windows Explorer looks happy and saves file.
- * NOTE: that is not DAV LOCK imlementation, it is just a way to shut up
- * Windows native DAV client. This is why FAKE LOCK is not enabed by default
- */
-MG_INTERNAL void mg_handle_lock(struct mg_connection *nc, const char *path) {
-  static const char *reply =
-      "HTTP/1.1 207 Multi-Status\r\n"
-      "Connection: close\r\n"
-      "Content-Type: text/xml; charset=utf-8\r\n\r\n"
-      "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
-      "<d:multistatus xmlns:d='DAV:'>\n"
-      "<D:lockdiscovery>\n"
-      "<D:activelock>\n"
-      "<D:locktoken>\n"
-      "<D:href>\n"
-      "opaquelocktoken:%s%u"
-      "</D:href>"
-      "</D:locktoken>"
-      "</D:activelock>\n"
-      "</D:lockdiscovery>"
-      "</d:multistatus>\n";
-  mg_printf(nc, reply, path, (unsigned int) mg_time());
-  nc->flags |= MG_F_SEND_AND_CLOSE;
-}
-#endif
-
-MG_INTERNAL void mg_handle_mkcol(struct mg_connection *nc, const char *path,
-                                 struct http_message *hm) {
-  int status_code = 500;
-  if (hm->body.len != (size_t) ~0 && hm->body.len > 0) {
-    status_code = 415;
-  } else if (!mg_mkdir(path, 0755)) {
-    status_code = 201;
-  } else if (errno == EEXIST) {
-    status_code = 405;
-  } else if (errno == EACCES) {
-    status_code = 403;
-  } else if (errno == ENOENT) {
-    status_code = 409;
-  } else {
-    status_code = 500;
-  }
-  mg_http_send_error(nc, status_code, NULL);
-}
-
-static int mg_remove_directory(const struct mg_serve_http_opts *opts,
-                               const char *dir) {
-  char path[MG_MAX_PATH];
-  struct dirent *dp;
-  cs_stat_t st;
-  DIR *dirp;
-
-  if ((dirp = opendir(dir)) == NULL) return 0;
-
-  while ((dp = readdir(dirp)) != NULL) {
-    if (mg_is_file_hidden((const char *) dp->d_name, opts, 1)) {
-      continue;
-    }
-    snprintf(path, sizeof(path), "%s%c%s", dir, '/', dp->d_name);
-    mg_stat(path, &st);
-    if (S_ISDIR(st.st_mode)) {
-      mg_remove_directory(opts, path);
-    } else {
-      remove(path);
-    }
-  }
-  closedir(dirp);
-  rmdir(dir);
-
-  return 1;
-}
-
-MG_INTERNAL void mg_handle_move(struct mg_connection *c,
-                                const struct mg_serve_http_opts *opts,
-                                const char *path, struct http_message *hm) {
-  const struct mg_str *dest = mg_get_http_header(hm, "Destination");
-  if (dest == NULL) {
-    mg_http_send_error(c, 411, NULL);
-  } else {
-    const char *p = (char *) memchr(dest->p, '/', dest->len);
-    if (p != NULL && p[1] == '/' &&
-        (p = (char *) memchr(p + 2, '/', dest->p + dest->len - p)) != NULL) {
-      char buf[MG_MAX_PATH];
-      snprintf(buf, sizeof(buf), "%s%.*s", opts->dav_document_root,
-               (int) (dest->p + dest->len - p), p);
-      if (rename(path, buf) == 0) {
-        mg_http_send_error(c, 200, NULL);
-      } else {
-        mg_http_send_error(c, 418, NULL);
-      }
-    } else {
-      mg_http_send_error(c, 500, NULL);
-    }
-  }
-}
-
-MG_INTERNAL void mg_handle_delete(struct mg_connection *nc,
-                                  const struct mg_serve_http_opts *opts,
-                                  const char *path) {
-  cs_stat_t st;
-  if (mg_stat(path, &st) != 0) {
-    mg_http_send_error(nc, 404, NULL);
-  } else if (S_ISDIR(st.st_mode)) {
-    mg_remove_directory(opts, path);
-    mg_http_send_error(nc, 204, NULL);
-  } else if (remove(path) == 0) {
-    mg_http_send_error(nc, 204, NULL);
-  } else {
-    mg_http_send_error(nc, 423, NULL);
-  }
-}
-
-/* Return -1 on error, 1 on success. */
-static int mg_create_itermediate_directories(const char *path) {
-  const char *s;
-
-  /* Create intermediate directories if they do not exist */
-  for (s = path + 1; *s != '\0'; s++) {
-    if (*s == '/') {
-      char buf[MG_MAX_PATH];
-      cs_stat_t st;
-      snprintf(buf, sizeof(buf), "%.*s", (int) (s - path), path);
-      buf[sizeof(buf) - 1] = '\0';
-      if (mg_stat(buf, &st) != 0 && mg_mkdir(buf, 0755) != 0) {
-        return -1;
-      }
-    }
-  }
-
-  return 1;
-}
-
-MG_INTERNAL void mg_handle_put(struct mg_connection *nc, const char *path,
-                               struct http_message *hm) {
-  struct mg_http_proto_data *pd = mg_http_get_proto_data(nc);
-  cs_stat_t st;
-  const struct mg_str *cl_hdr = mg_get_http_header(hm, "Content-Length");
-  int rc, status_code = mg_stat(path, &st) == 0 ? 200 : 201;
-
-  mg_http_free_proto_data_file(&pd->file);
-  if ((rc = mg_create_itermediate_directories(path)) == 0) {
-    mg_printf(nc, "HTTP/1.1 %d OK\r\nContent-Length: 0\r\n\r\n", status_code);
-  } else if (rc == -1) {
-    mg_http_send_error(nc, 500, NULL);
-  } else if (cl_hdr == NULL) {
-    mg_http_send_error(nc, 411, NULL);
-  } else if ((pd->file.fp = mg_fopen(path, "w+b")) == NULL) {
-    mg_http_send_error(nc, 500, NULL);
-  } else {
-    const struct mg_str *range_hdr = mg_get_http_header(hm, "Content-Range");
-    int64_t r1 = 0, r2 = 0;
-    pd->file.type = DATA_PUT;
-    mg_set_close_on_exec((sock_t) fileno(pd->file.fp));
-    pd->file.cl = to64(cl_hdr->p);
-    if (range_hdr != NULL &&
-        mg_http_parse_range_header(range_hdr, &r1, &r2) > 0) {
-      status_code = 206;
-      fseeko(pd->file.fp, r1, SEEK_SET);
-      pd->file.cl = r2 > r1 ? r2 - r1 + 1 : pd->file.cl - r1;
-    }
-    mg_printf(nc, "HTTP/1.1 %d OK\r\nContent-Length: 0\r\n\r\n", status_code);
-    /* Remove HTTP request from the mbuf, leave only payload */
-    mbuf_remove(&nc->recv_mbuf, hm->message.len - hm->body.len);
-    mg_http_transfer_file_data(nc);
-  }
-}
-
-#endif /* MG_ENABLE_HTTP && MG_ENABLE_HTTP_WEBDAV */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_http_websocket.c"
-#endif
-
-#if MG_ENABLE_HTTP && MG_ENABLE_HTTP_WEBSOCKET
-
-/* Amalgamated: #include "common/cs_sha1.h" */
-
-#ifndef MG_WEBSOCKET_PING_INTERVAL_SECONDS
-#define MG_WEBSOCKET_PING_INTERVAL_SECONDS 5
-#endif
-
-#define FLAGS_MASK_FIN (1 << 7)
-#define FLAGS_MASK_OP 0x0f
-
-static int mg_is_ws_fragment(unsigned char flags) {
-  return (flags & FLAGS_MASK_FIN) == 0 ||
-         (flags & FLAGS_MASK_OP) == WEBSOCKET_OP_CONTINUE;
-}
-
-static int mg_is_ws_first_fragment(unsigned char flags) {
-  return (flags & FLAGS_MASK_FIN) == 0 &&
-         (flags & FLAGS_MASK_OP) != WEBSOCKET_OP_CONTINUE;
-}
-
-static int mg_is_ws_control_frame(unsigned char flags) {
-  unsigned char op = (flags & FLAGS_MASK_OP);
-  return op == WEBSOCKET_OP_CLOSE || op == WEBSOCKET_OP_PING ||
-         op == WEBSOCKET_OP_PONG;
-}
-
-static void mg_handle_incoming_websocket_frame(struct mg_connection *nc,
-                                               struct websocket_message *wsm) {
-  if (wsm->flags & 0x8) {
-    mg_call(nc, nc->handler, nc->user_data, MG_EV_WEBSOCKET_CONTROL_FRAME, wsm);
-  } else {
-    mg_call(nc, nc->handler, nc->user_data, MG_EV_WEBSOCKET_FRAME, wsm);
-  }
-}
-
-static struct mg_ws_proto_data *mg_ws_get_proto_data(struct mg_connection *nc) {
-  struct mg_http_proto_data *htd = mg_http_get_proto_data(nc);
-  return (htd != NULL ? &htd->ws_data : NULL);
-}
-
-/*
- * Sends a Close websocket frame with the given data, and closes the underlying
- * connection. If `len` is ~0, strlen(data) is used.
- */
-static void mg_ws_close(struct mg_connection *nc, const void *data,
-                        size_t len) {
-  if ((int) len == ~0) {
-    len = strlen((const char *) data);
-  }
-  mg_send_websocket_frame(nc, WEBSOCKET_OP_CLOSE, data, len);
-  nc->flags |= MG_F_SEND_AND_CLOSE;
-}
-
-static int mg_deliver_websocket_data(struct mg_connection *nc) {
-  /* Using unsigned char *, cause of integer arithmetic below */
-  uint64_t i, data_len = 0, frame_len = 0, new_data_len = nc->recv_mbuf.len,
-              len, mask_len = 0, header_len = 0;
-  struct mg_ws_proto_data *wsd = mg_ws_get_proto_data(nc);
-  unsigned char *new_data = (unsigned char *) nc->recv_mbuf.buf,
-                *e = (unsigned char *) nc->recv_mbuf.buf + nc->recv_mbuf.len;
-  uint8_t flags;
-  int ok, reass;
-
-  if (wsd->reass_len > 0) {
-    /*
-     * We already have some previously received data which we need to
-     * reassemble and deliver to the client code when we get the final
-     * fragment.
-     *
-     * NOTE: it doesn't mean that the current message must be a continuation:
-     * it might be a control frame (Close, Ping or Pong), which should be
-     * handled without breaking the fragmented message.
-     */
-
-    size_t existing_len = wsd->reass_len;
-    assert(new_data_len >= existing_len);
-
-    new_data += existing_len;
-    new_data_len -= existing_len;
-  }
-
-  flags = new_data[0];
-
-  reass = new_data_len > 0 && mg_is_ws_fragment(flags) &&
-          !(nc->flags & MG_F_WEBSOCKET_NO_DEFRAG);
-
-  if (reass && mg_is_ws_control_frame(flags)) {
-    /*
-     * Control frames can't be fragmented, so if we encounter fragmented
-     * control frame, close connection immediately.
-     */
-    mg_ws_close(nc, "fragmented control frames are illegal", ~0);
-    return 0;
-  } else if (new_data_len > 0 && !reass && !mg_is_ws_control_frame(flags) &&
-             wsd->reass_len > 0) {
-    /*
-     * When in the middle of a fragmented message, only the continuations
-     * and control frames are allowed.
-     */
-    mg_ws_close(nc, "non-continuation in the middle of a fragmented message",
-                ~0);
-    return 0;
-  }
-
-  if (new_data_len >= 2) {
-    len = new_data[1] & 0x7f;
-    mask_len = new_data[1] & FLAGS_MASK_FIN ? 4 : 0;
-    if (len < 126 && new_data_len >= mask_len) {
-      data_len = len;
-      header_len = 2 + mask_len;
-    } else if (len == 126 && new_data_len >= 4 + mask_len) {
-      header_len = 4 + mask_len;
-      data_len = ntohs(*(uint16_t *) &new_data[2]);
-    } else if (new_data_len >= 10 + mask_len) {
-      header_len = 10 + mask_len;
-      data_len = (((uint64_t) ntohl(*(uint32_t *) &new_data[2])) << 32) +
-                 ntohl(*(uint32_t *) &new_data[6]);
-    }
-  }
-
-  frame_len = header_len + data_len;
-  ok = (frame_len > 0 && frame_len <= new_data_len);
-
-  /* Check for overflow */
-  if (frame_len < header_len || frame_len < data_len) {
-    ok = 0;
-    mg_ws_close(nc, "overflowed message", ~0);
-  }
-
-  if (ok) {
-    size_t cleanup_len = 0;
-    struct websocket_message wsm;
-
-    wsm.size = (size_t) data_len;
-    wsm.data = new_data + header_len;
-    wsm.flags = flags;
-
-    /* Apply mask if necessary */
-    if (mask_len > 0) {
-      for (i = 0; i < data_len; i++) {
-        new_data[i + header_len] ^= (new_data + header_len - mask_len)[i % 4];
-      }
-    }
-
-    if (reass) {
-      /* This is a message fragment */
-
-      if (mg_is_ws_first_fragment(flags)) {
-        /*
-         * On the first fragmented frame, skip the first byte (op) and also
-         * reset size to 1 (op), it'll be incremented with the data len below.
-         */
-        new_data += 1;
-        wsd->reass_len = 1 /* op */;
-      }
-
-      /* Append this frame to the reassembled buffer */
-      memmove(new_data, wsm.data, e - wsm.data);
-      wsd->reass_len += wsm.size;
-      nc->recv_mbuf.len -= wsm.data - new_data;
-
-      if (flags & FLAGS_MASK_FIN) {
-        /* On last fragmented frame - call user handler and remove data */
-        wsm.flags = FLAGS_MASK_FIN | nc->recv_mbuf.buf[0];
-        wsm.data = (unsigned char *) nc->recv_mbuf.buf + 1 /* op */;
-        wsm.size = wsd->reass_len - 1 /* op */;
-        cleanup_len = wsd->reass_len;
-        wsd->reass_len = 0;
-
-        /* Pass reassembled message to the client code. */
-        mg_handle_incoming_websocket_frame(nc, &wsm);
-        mbuf_remove(&nc->recv_mbuf, cleanup_len); /* Cleanup frame */
-      }
-    } else {
-      /*
-       * This is a complete message, not a fragment. It might happen in between
-       * of a fragmented message (in this case, WebSocket protocol requires
-       * current message to be a control frame).
-       */
-      cleanup_len = (size_t) frame_len;
-
-      /* First of all, check if we need to react on a control frame. */
-      switch (flags & FLAGS_MASK_OP) {
-        case WEBSOCKET_OP_PING:
-          mg_send_websocket_frame(nc, WEBSOCKET_OP_PONG, wsm.data, wsm.size);
-          break;
-
-        case WEBSOCKET_OP_CLOSE:
-          mg_ws_close(nc, wsm.data, wsm.size);
-          break;
-      }
-
-      /* Pass received message to the client code. */
-      mg_handle_incoming_websocket_frame(nc, &wsm);
-
-      /* Cleanup frame */
-      memmove(nc->recv_mbuf.buf + wsd->reass_len,
-              nc->recv_mbuf.buf + wsd->reass_len + cleanup_len,
-              nc->recv_mbuf.len - wsd->reass_len - cleanup_len);
-      nc->recv_mbuf.len -= cleanup_len;
-    }
-  }
-
-  return ok;
-}
-
-struct ws_mask_ctx {
-  size_t pos; /* zero means unmasked */
-  uint32_t mask;
-};
-
-static uint32_t mg_ws_random_mask(void) {
-  uint32_t mask;
-/*
- * The spec requires WS client to generate hard to
- * guess mask keys. From RFC6455, Section 5.3:
- *
- * The unpredictability of the masking key is essential to prevent
- * authors of malicious applications from selecting the bytes that appear on
- * the wire.
- *
- * Hence this feature is essential when the actual end user of this API
- * is untrusted code that wouldn't have access to a lower level net API
- * anyway (e.g. web browsers). Hence this feature is low prio for most
- * mongoose use cases and thus can be disabled, e.g. when porting to a platform
- * that lacks rand().
- */
-#if MG_DISABLE_WS_RANDOM_MASK
-  mask = 0xefbeadde; /* generated with a random number generator, I swear */
-#else
-  if (sizeof(long) >= 4) {
-    mask = (uint32_t) rand();
-  } else if (sizeof(long) == 2) {
-    mask = (uint32_t) rand() << 16 | (uint32_t) rand();
-  }
-#endif
-  return mask;
-}
-
-static void mg_send_ws_header(struct mg_connection *nc, int op, size_t len,
-                              struct ws_mask_ctx *ctx) {
-  int header_len;
-  unsigned char header[10];
-
-  header[0] =
-      (op & WEBSOCKET_DONT_FIN ? 0x0 : FLAGS_MASK_FIN) | (op & FLAGS_MASK_OP);
-  if (len < 126) {
-    header[1] = (unsigned char) len;
-    header_len = 2;
-  } else if (len < 65535) {
-    uint16_t tmp = htons((uint16_t) len);
-    header[1] = 126;
-    memcpy(&header[2], &tmp, sizeof(tmp));
-    header_len = 4;
-  } else {
-    uint32_t tmp;
-    header[1] = 127;
-    tmp = htonl((uint32_t)((uint64_t) len >> 32));
-    memcpy(&header[2], &tmp, sizeof(tmp));
-    tmp = htonl((uint32_t)(len & 0xffffffff));
-    memcpy(&header[6], &tmp, sizeof(tmp));
-    header_len = 10;
-  }
-
-  /* client connections enable masking */
-  if (nc->listener == NULL) {
-    header[1] |= 1 << 7; /* set masking flag */
-    mg_send(nc, header, header_len);
-    ctx->mask = mg_ws_random_mask();
-    mg_send(nc, &ctx->mask, sizeof(ctx->mask));
-    ctx->pos = nc->send_mbuf.len;
-  } else {
-    mg_send(nc, header, header_len);
-    ctx->pos = 0;
-  }
-}
-
-static void mg_ws_mask_frame(struct mbuf *mbuf, struct ws_mask_ctx *ctx) {
-  size_t i;
-  if (ctx->pos == 0) return;
-  for (i = 0; i < (mbuf->len - ctx->pos); i++) {
-    mbuf->buf[ctx->pos + i] ^= ((char *) &ctx->mask)[i % 4];
-  }
-}
-
-void mg_send_websocket_frame(struct mg_connection *nc, int op, const void *data,
-                             size_t len) {
-  struct ws_mask_ctx ctx;
-  DBG(("%p %d %d", nc, op, (int) len));
-  mg_send_ws_header(nc, op, len, &ctx);
-  mg_send(nc, data, len);
-
-  mg_ws_mask_frame(&nc->send_mbuf, &ctx);
-
-  if (op == WEBSOCKET_OP_CLOSE) {
-    nc->flags |= MG_F_SEND_AND_CLOSE;
-  }
-}
-
-void mg_send_websocket_framev(struct mg_connection *nc, int op,
-                              const struct mg_str *strv, int strvcnt) {
-  struct ws_mask_ctx ctx;
-  int i;
-  int len = 0;
-  for (i = 0; i < strvcnt; i++) {
-    len += strv[i].len;
-  }
-
-  mg_send_ws_header(nc, op, len, &ctx);
-
-  for (i = 0; i < strvcnt; i++) {
-    mg_send(nc, strv[i].p, strv[i].len);
-  }
-
-  mg_ws_mask_frame(&nc->send_mbuf, &ctx);
-
-  if (op == WEBSOCKET_OP_CLOSE) {
-    nc->flags |= MG_F_SEND_AND_CLOSE;
-  }
-}
-
-void mg_printf_websocket_frame(struct mg_connection *nc, int op,
-                               const char *fmt, ...) {
-  char mem[MG_VPRINTF_BUFFER_SIZE], *buf = mem;
-  va_list ap;
-  int len;
-
-  va_start(ap, fmt);
-  if ((len = mg_avprintf(&buf, sizeof(mem), fmt, ap)) > 0) {
-    mg_send_websocket_frame(nc, op, buf, len);
-  }
-  va_end(ap);
-
-  if (buf != mem && buf != NULL) {
-    MG_FREE(buf);
-  }
-}
-
-MG_INTERNAL void mg_ws_handler(struct mg_connection *nc, int ev,
-                               void *ev_data MG_UD_ARG(void *user_data)) {
-  mg_call(nc, nc->handler, nc->user_data, ev, ev_data);
-
-  switch (ev) {
-    case MG_EV_RECV:
-      do {
-      } while (mg_deliver_websocket_data(nc));
-      break;
-    case MG_EV_POLL:
-      /* Ping idle websocket connections */
-      {
-        time_t now = *(time_t *) ev_data;
-        if (nc->flags & MG_F_IS_WEBSOCKET &&
-            now > nc->last_io_time + MG_WEBSOCKET_PING_INTERVAL_SECONDS) {
-          mg_send_websocket_frame(nc, WEBSOCKET_OP_PING, "", 0);
-        }
-      }
-      break;
-    default:
-      break;
-  }
-#if MG_ENABLE_CALLBACK_USERDATA
-  (void) user_data;
-#endif
-}
-
-#ifndef MG_EXT_SHA1
-void mg_hash_sha1_v(size_t num_msgs, const uint8_t *msgs[],
-                    const size_t *msg_lens, uint8_t *digest) {
-  size_t i;
-  cs_sha1_ctx sha_ctx;
-  cs_sha1_init(&sha_ctx);
-  for (i = 0; i < num_msgs; i++) {
-    cs_sha1_update(&sha_ctx, msgs[i], msg_lens[i]);
-  }
-  cs_sha1_final(digest, &sha_ctx);
-}
-#else
-extern void mg_hash_sha1_v(size_t num_msgs, const uint8_t *msgs[],
-                           const size_t *msg_lens, uint8_t *digest);
-#endif
-
-MG_INTERNAL void mg_ws_handshake(struct mg_connection *nc,
-                                 const struct mg_str *key,
-                                 struct http_message *hm) {
-  static const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
-  const uint8_t *msgs[2] = {(const uint8_t *) key->p, (const uint8_t *) magic};
-  const size_t msg_lens[2] = {key->len, 36};
-  unsigned char sha[20];
-  char b64_sha[30];
-  struct mg_str *s;
-
-  mg_hash_sha1_v(2, msgs, msg_lens, sha);
-  mg_base64_encode(sha, sizeof(sha), b64_sha);
-  mg_printf(nc, "%s",
-            "HTTP/1.1 101 Switching Protocols\r\n"
-            "Upgrade: websocket\r\n"
-            "Connection: Upgrade\r\n");
-
-  s = mg_get_http_header(hm, "Sec-WebSocket-Protocol");
-  if (s != NULL) {
-    mg_printf(nc, "Sec-WebSocket-Protocol: %.*s\r\n", (int) s->len, s->p);
-  }
-  mg_printf(nc, "Sec-WebSocket-Accept: %s%s", b64_sha, "\r\n\r\n");
-
-  DBG(("%p %.*s %s", nc, (int) key->len, key->p, b64_sha));
-}
-
-void mg_send_websocket_handshake2(struct mg_connection *nc, const char *path,
-                                  const char *host, const char *protocol,
-                                  const char *extra_headers) {
-  mg_send_websocket_handshake3(nc, path, host, protocol, extra_headers, NULL,
-                               NULL);
-}
-
-void mg_send_websocket_handshake3(struct mg_connection *nc, const char *path,
-                                  const char *host, const char *protocol,
-                                  const char *extra_headers, const char *user,
-                                  const char *pass) {
-  mg_send_websocket_handshake3v(nc, mg_mk_str(path), mg_mk_str(host),
-                                mg_mk_str(protocol), mg_mk_str(extra_headers),
-                                mg_mk_str(user), mg_mk_str(pass));
-}
-
-void mg_send_websocket_handshake3v(struct mg_connection *nc,
-                                   const struct mg_str path,
-                                   const struct mg_str host,
-                                   const struct mg_str protocol,
-                                   const struct mg_str extra_headers,
-                                   const struct mg_str user,
-                                   const struct mg_str pass) {
-  struct mbuf auth;
-  char key[25];
-  uint32_t nonce[4];
-  nonce[0] = mg_ws_random_mask();
-  nonce[1] = mg_ws_random_mask();
-  nonce[2] = mg_ws_random_mask();
-  nonce[3] = mg_ws_random_mask();
-  mg_base64_encode((unsigned char *) &nonce, sizeof(nonce), key);
-
-  mbuf_init(&auth, 0);
-  if (user.len > 0) {
-    mg_basic_auth_header(user, pass, &auth);
-  }
-
-  /*
-   * NOTE: the  (auth.buf == NULL ? "" : auth.buf) is because cc3200 libc is
-   * broken: it doesn't like zero length to be passed to %.*s
-   * i.e. sprintf("f%.*so", (int)0, NULL), yields `f\0o`.
-   * because it handles NULL specially (and incorrectly).
-   */
-  mg_printf(nc,
-            "GET %.*s HTTP/1.1\r\n"
-            "Upgrade: websocket\r\n"
-            "Connection: Upgrade\r\n"
-            "%.*s"
-            "Sec-WebSocket-Version: 13\r\n"
-            "Sec-WebSocket-Key: %s\r\n",
-            (int) path.len, path.p, (int) auth.len,
-            (auth.buf == NULL ? "" : auth.buf), key);
-
-  /* TODO(mkm): take default hostname from http proto data if host == NULL */
-  if (host.len > 0) {
-    int host_len = (int) (path.p - host.p); /* Account for possible :PORT */
-    mg_printf(nc, "Host: %.*s\r\n", host_len, host.p);
-  }
-  if (protocol.len > 0) {
-    mg_printf(nc, "Sec-WebSocket-Protocol: %.*s\r\n", (int) protocol.len,
-              protocol.p);
-  }
-  if (extra_headers.len > 0) {
-    mg_printf(nc, "%.*s", (int) extra_headers.len, extra_headers.p);
-  }
-  mg_printf(nc, "\r\n");
-
-  nc->flags |= MG_F_IS_WEBSOCKET;
-
-  mbuf_free(&auth);
-}
-
-void mg_send_websocket_handshake(struct mg_connection *nc, const char *path,
-                                 const char *extra_headers) {
-  struct mg_str null_str = MG_NULL_STR;
-  mg_send_websocket_handshake3v(
-      nc, mg_mk_str(path), null_str /* host */, null_str /* protocol */,
-      mg_mk_str(extra_headers), null_str /* user */, null_str /* pass */);
-}
-
-struct mg_connection *mg_connect_ws_opt(
-    struct mg_mgr *mgr, MG_CB(mg_event_handler_t ev_handler, void *user_data),
-    struct mg_connect_opts opts, const char *url, const char *protocol,
-    const char *extra_headers) {
-  struct mg_str null_str = MG_NULL_STR;
-  struct mg_str host = MG_NULL_STR, path = MG_NULL_STR, user_info = MG_NULL_STR;
-  struct mg_connection *nc =
-      mg_connect_http_base(mgr, MG_CB(ev_handler, user_data), opts, "http",
-                           "ws", "https", "wss", url, &path, &user_info, &host);
-  if (nc != NULL) {
-    mg_send_websocket_handshake3v(nc, path, host, mg_mk_str(protocol),
-                                  mg_mk_str(extra_headers), user_info,
-                                  null_str);
-  }
-  return nc;
-}
-
-struct mg_connection *mg_connect_ws(
-    struct mg_mgr *mgr, MG_CB(mg_event_handler_t ev_handler, void *user_data),
-    const char *url, const char *protocol, const char *extra_headers) {
-  struct mg_connect_opts opts;
-  memset(&opts, 0, sizeof(opts));
-  return mg_connect_ws_opt(mgr, MG_CB(ev_handler, user_data), opts, url,
-                           protocol, extra_headers);
-}
-#endif /* MG_ENABLE_HTTP && MG_ENABLE_HTTP_WEBSOCKET */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_util.c"
-#endif
-
-/* Amalgamated: #include "common/cs_base64.h" */
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_util.h" */
-
-/* For platforms with limited libc */
-#ifndef MAX
-#define MAX(a, b) ((a) > (b) ? (a) : (b))
-#endif
-
-const char *mg_skip(const char *s, const char *end, const char *delims,
-                    struct mg_str *v) {
-  v->p = s;
-  while (s < end && strchr(delims, *(unsigned char *) s) == NULL) s++;
-  v->len = s - v->p;
-  while (s < end && strchr(delims, *(unsigned char *) s) != NULL) s++;
-  return s;
-}
-
-#if MG_ENABLE_FILESYSTEM && !defined(MG_USER_FILE_FUNCTIONS)
-int mg_stat(const char *path, cs_stat_t *st) {
-#ifdef _WIN32
-  wchar_t wpath[MG_MAX_PATH];
-  to_wchar(path, wpath, ARRAY_SIZE(wpath));
-  DBG(("[%ls] -> %d", wpath, _wstati64(wpath, st)));
-  return _wstati64(wpath, st);
-#else
-  return stat(path, st);
-#endif
-}
-
-FILE *mg_fopen(const char *path, const char *mode) {
-#ifdef _WIN32
-  wchar_t wpath[MG_MAX_PATH], wmode[10];
-  to_wchar(path, wpath, ARRAY_SIZE(wpath));
-  to_wchar(mode, wmode, ARRAY_SIZE(wmode));
-  return _wfopen(wpath, wmode);
-#else
-  return fopen(path, mode);
-#endif
-}
-
-int mg_open(const char *path, int flag, int mode) { /* LCOV_EXCL_LINE */
-#if defined(_WIN32) && !defined(WINCE)
-  wchar_t wpath[MG_MAX_PATH];
-  to_wchar(path, wpath, ARRAY_SIZE(wpath));
-  return _wopen(wpath, flag, mode);
-#else
-  return open(path, flag, mode); /* LCOV_EXCL_LINE */
-#endif
-}
-
-size_t mg_fread(void *ptr, size_t size, size_t count, FILE *f) {
-  return fread(ptr, size, count, f);
-}
-
-size_t mg_fwrite(const void *ptr, size_t size, size_t count, FILE *f) {
-  return fwrite(ptr, size, count, f);
-}
-#endif
-
-void mg_base64_encode(const unsigned char *src, int src_len, char *dst) {
-  cs_base64_encode(src, src_len, dst);
-}
-
-int mg_base64_decode(const unsigned char *s, int len, char *dst) {
-  return cs_base64_decode(s, len, dst, NULL);
-}
-
-#if MG_ENABLE_THREADS
-void *mg_start_thread(void *(*f)(void *), void *p) {
-#ifdef WINCE
-  return (void *) CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) f, p, 0, NULL);
-#elif defined(_WIN32)
-  return (void *) _beginthread((void(__cdecl *) (void *) ) f, 0, p);
-#else
-  pthread_t thread_id = (pthread_t) 0;
-  pthread_attr_t attr;
-
-  (void) pthread_attr_init(&attr);
-  (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
-
-#if defined(MG_STACK_SIZE) && MG_STACK_SIZE > 1
-  (void) pthread_attr_setstacksize(&attr, MG_STACK_SIZE);
-#endif
-
-  pthread_create(&thread_id, &attr, f, p);
-  pthread_attr_destroy(&attr);
-
-  return (void *) thread_id;
-#endif
-}
-#endif /* MG_ENABLE_THREADS */
-
-/* Set close-on-exec bit for a given socket. */
-void mg_set_close_on_exec(sock_t sock) {
-#if defined(_WIN32) && !defined(WINCE)
-  (void) SetHandleInformation((HANDLE) sock, HANDLE_FLAG_INHERIT, 0);
-#elif defined(__unix__)
-  fcntl(sock, F_SETFD, FD_CLOEXEC);
-#else
-  (void) sock;
-#endif
-}
-
-int mg_sock_addr_to_str(const union socket_address *sa, char *buf, size_t len,
-                        int flags) {
-  int is_v6;
-  if (buf == NULL || len <= 0) return 0;
-  memset(buf, 0, len);
-#if MG_ENABLE_IPV6
-  is_v6 = sa->sa.sa_family == AF_INET6;
-#else
-  is_v6 = 0;
-#endif
-  if (flags & MG_SOCK_STRINGIFY_IP) {
-#if MG_ENABLE_IPV6
-    const void *addr = NULL;
-    char *start = buf;
-    socklen_t capacity = len;
-    if (!is_v6) {
-      addr = &sa->sin.sin_addr;
-    } else {
-      addr = (void *) &sa->sin6.sin6_addr;
-      if (flags & MG_SOCK_STRINGIFY_PORT) {
-        *buf = '[';
-        start++;
-        capacity--;
-      }
-    }
-    if (inet_ntop(sa->sa.sa_family, addr, start, capacity) == NULL) {
-      goto cleanup;
-    }
-#elif defined(_WIN32) || MG_LWIP || (MG_NET_IF == MG_NET_IF_PIC32)
-    /* Only Windoze Vista (and newer) have inet_ntop() */
-    char *addr_str = inet_ntoa(sa->sin.sin_addr);
-    if (addr_str != NULL) {
-      strncpy(buf, inet_ntoa(sa->sin.sin_addr), len - 1);
-    } else {
-      goto cleanup;
-    }
-#else
-    if (inet_ntop(AF_INET, (void *) &sa->sin.sin_addr, buf, len) == NULL) {
-      goto cleanup;
-    }
-#endif
-  }
-  if (flags & MG_SOCK_STRINGIFY_PORT) {
-    int port = ntohs(sa->sin.sin_port);
-    if (flags & MG_SOCK_STRINGIFY_IP) {
-      int buf_len = strlen(buf);
-      snprintf(buf + buf_len, len - (buf_len + 1), "%s:%d", (is_v6 ? "]" : ""),
-               port);
-    } else {
-      snprintf(buf, len, "%d", port);
-    }
-  }
-
-  return strlen(buf);
-
-cleanup:
-  *buf = '\0';
-  return 0;
-}
-
-int mg_conn_addr_to_str(struct mg_connection *nc, char *buf, size_t len,
-                        int flags) {
-  union socket_address sa;
-  memset(&sa, 0, sizeof(sa));
-  mg_if_get_conn_addr(nc, flags & MG_SOCK_STRINGIFY_REMOTE, &sa);
-  return mg_sock_addr_to_str(&sa, buf, len, flags);
-}
-
-#if MG_ENABLE_HEXDUMP
-static int mg_hexdump_n(const void *buf, int len, char *dst, int dst_len,
-                        int offset) {
-  const unsigned char *p = (const unsigned char *) buf;
-  char ascii[17] = "";
-  int i, idx, n = 0;
-
-  for (i = 0; i < len; i++) {
-    idx = i % 16;
-    if (idx == 0) {
-      if (i > 0) n += snprintf(dst + n, MAX(dst_len - n, 0), "  %s\n", ascii);
-      n += snprintf(dst + n, MAX(dst_len - n, 0), "%04x ", i + offset);
-    }
-    if (dst_len - n < 0) {
-      return n;
-    }
-    n += snprintf(dst + n, MAX(dst_len - n, 0), " %02x", p[i]);
-    ascii[idx] = p[i] < 0x20 || p[i] > 0x7e ? '.' : p[i];
-    ascii[idx + 1] = '\0';
-  }
-
-  while (i++ % 16) n += snprintf(dst + n, MAX(dst_len - n, 0), "%s", "   ");
-  n += snprintf(dst + n, MAX(dst_len - n, 0), "  %s\n", ascii);
-
-  return n;
-}
-
-int mg_hexdump(const void *buf, int len, char *dst, int dst_len) {
-  return mg_hexdump_n(buf, len, dst, dst_len, 0);
-}
-
-void mg_hexdumpf(FILE *fp, const void *buf, int len) {
-  char tmp[80];
-  int offset = 0, n;
-  while (len > 0) {
-    n = (len < 16 ? len : 16);
-    mg_hexdump_n(((const char *) buf) + offset, n, tmp, sizeof(tmp), offset);
-    fputs(tmp, fp);
-    offset += n;
-    len -= n;
-  }
-}
-
-void mg_hexdump_connection(struct mg_connection *nc, const char *path,
-                           const void *buf, int num_bytes, int ev) {
-  FILE *fp = NULL;
-  char src[60], dst[60];
-  const char *tag = NULL;
-  switch (ev) {
-    case MG_EV_RECV:
-      tag = "<-";
-      break;
-    case MG_EV_SEND:
-      tag = "->";
-      break;
-    case MG_EV_ACCEPT:
-      tag = "<A";
-      break;
-    case MG_EV_CONNECT:
-      tag = "C>";
-      break;
-    case MG_EV_CLOSE:
-      tag = "XX";
-      break;
-  }
-  if (tag == NULL) return; /* Don't log MG_EV_TIMER, etc */
-
-  if (strcmp(path, "-") == 0) {
-    fp = stdout;
-  } else if (strcmp(path, "--") == 0) {
-    fp = stderr;
-#if MG_ENABLE_FILESYSTEM
-  } else {
-    fp = mg_fopen(path, "a");
-#endif
-  }
-  if (fp == NULL) return;
-
-  mg_conn_addr_to_str(nc, src, sizeof(src),
-                      MG_SOCK_STRINGIFY_IP | MG_SOCK_STRINGIFY_PORT);
-  mg_conn_addr_to_str(nc, dst, sizeof(dst), MG_SOCK_STRINGIFY_IP |
-                                                MG_SOCK_STRINGIFY_PORT |
-                                                MG_SOCK_STRINGIFY_REMOTE);
-  fprintf(fp, "%lu %p %s %s %s %d\n", (unsigned long) mg_time(), (void *) nc,
-          src, tag, dst, (int) num_bytes);
-  if (num_bytes > 0) {
-    mg_hexdumpf(fp, buf, num_bytes);
-  }
-  if (fp != stdout && fp != stderr) fclose(fp);
-}
-#endif
-
-int mg_is_big_endian(void) {
-  static const int n = 1;
-  /* TODO(mkm) use compiletime check with 4-byte char literal */
-  return ((char *) &n)[0] == 0;
-}
-
-DO_NOT_WARN_UNUSED MG_INTERNAL int mg_get_errno(void) {
-#ifndef WINCE
-  return errno;
-#else
-  /* TODO(alashkin): translate error codes? */
-  return GetLastError();
-#endif
-}
-
-void mg_mbuf_append_base64_putc(char ch, void *user_data) {
-  struct mbuf *mbuf = (struct mbuf *) user_data;
-  mbuf_append(mbuf, &ch, sizeof(ch));
-}
-
-void mg_mbuf_append_base64(struct mbuf *mbuf, const void *data, size_t len) {
-  struct cs_base64_ctx ctx;
-  cs_base64_init(&ctx, mg_mbuf_append_base64_putc, mbuf);
-  cs_base64_update(&ctx, (const char *) data, len);
-  cs_base64_finish(&ctx);
-}
-
-void mg_basic_auth_header(const struct mg_str user, const struct mg_str pass,
-                          struct mbuf *buf) {
-  const char *header_prefix = "Authorization: Basic ";
-  const char *header_suffix = "\r\n";
-
-  struct cs_base64_ctx ctx;
-  cs_base64_init(&ctx, mg_mbuf_append_base64_putc, buf);
-
-  mbuf_append(buf, header_prefix, strlen(header_prefix));
-
-  cs_base64_update(&ctx, user.p, user.len);
-  if (pass.len > 0) {
-    cs_base64_update(&ctx, ":", 1);
-    cs_base64_update(&ctx, pass.p, pass.len);
-  }
-  cs_base64_finish(&ctx);
-  mbuf_append(buf, header_suffix, strlen(header_suffix));
-}
-
-struct mg_str mg_url_encode_opt(const struct mg_str src,
-                                const struct mg_str safe, unsigned int flags) {
-  const char *hex =
-      (flags & MG_URL_ENCODE_F_UPPERCASE_HEX ? "0123456789ABCDEF"
-                                             : "0123456789abcdef");
-  size_t i = 0;
-  struct mbuf mb;
-  mbuf_init(&mb, src.len);
-
-  for (i = 0; i < src.len; i++) {
-    const unsigned char c = *((const unsigned char *) src.p + i);
-    if (isalnum(c) || mg_strchr(safe, c) != NULL) {
-      mbuf_append(&mb, &c, 1);
-    } else if (c == ' ' && (flags & MG_URL_ENCODE_F_SPACE_AS_PLUS)) {
-      mbuf_append(&mb, "+", 1);
-    } else {
-      mbuf_append(&mb, "%", 1);
-      mbuf_append(&mb, &hex[c >> 4], 1);
-      mbuf_append(&mb, &hex[c & 15], 1);
-    }
-  }
-  mbuf_append(&mb, "", 1);
-  mbuf_trim(&mb);
-  return mg_mk_str_n(mb.buf, mb.len - 1);
-}
-
-struct mg_str mg_url_encode(const struct mg_str src) {
-  return mg_url_encode_opt(src, mg_mk_str("._-$,;~()/"), 0);
-}
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_mqtt.c"
-#endif
-
-#if MG_ENABLE_MQTT
-
-#include <string.h>
-
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_mqtt.h" */
-
-#define MG_F_MQTT_PING_PENDING MG_F_PROTO_1
-
-static uint16_t getu16(const char *p) {
-  const uint8_t *up = (const uint8_t *) p;
-  return (up[0] << 8) + up[1];
-}
-
-static const char *scanto(const char *p, struct mg_str *s) {
-  s->len = getu16(p);
-  s->p = p + 2;
-  return s->p + s->len;
-}
-
-MG_INTERNAL int parse_mqtt(struct mbuf *io, struct mg_mqtt_message *mm) {
-  uint8_t header;
-  uint32_t len, len_len; /* must be 32-bit, see #1055 */
-  const char *p, *end, *eop = &io->buf[io->len];
-  unsigned char lc = 0;
-  int cmd;
-
-  if (io->len < 2) return MG_MQTT_ERROR_INCOMPLETE_MSG;
-  header = io->buf[0];
-  cmd = header >> 4;
-
-  /* decode mqtt variable length */
-  len = len_len = 0;
-  p = io->buf + 1;
-  while (p < eop) {
-    lc = *((const unsigned char *) p++);
-    len += (lc & 0x7f) << 7 * len_len;
-    len_len++;
-    if (!(lc & 0x80)) break;
-    if (len_len > sizeof(len)) return MG_MQTT_ERROR_MALFORMED_MSG;
-  }
-
-  end = p + len;
-  if (lc & 0x80 || end > eop) return MG_MQTT_ERROR_INCOMPLETE_MSG;
-
-  mm->cmd = cmd;
-  mm->qos = MG_MQTT_GET_QOS(header);
-
-  switch (cmd) {
-    case MG_MQTT_CMD_CONNECT: {
-      p = scanto(p, &mm->protocol_name);
-      if (p > end - 4) return MG_MQTT_ERROR_MALFORMED_MSG;
-      mm->protocol_version = *(uint8_t *) p++;
-      mm->connect_flags = *(uint8_t *) p++;
-      mm->keep_alive_timer = getu16(p);
-      p += 2;
-      if (p >= end) return MG_MQTT_ERROR_MALFORMED_MSG;
-      p = scanto(p, &mm->client_id);
-      if (p > end) return MG_MQTT_ERROR_MALFORMED_MSG;
-      if (mm->connect_flags & MG_MQTT_HAS_WILL) {
-        if (p >= end) return MG_MQTT_ERROR_MALFORMED_MSG;
-        p = scanto(p, &mm->will_topic);
-      }
-      if (mm->connect_flags & MG_MQTT_HAS_WILL) {
-        if (p >= end) return MG_MQTT_ERROR_MALFORMED_MSG;
-        p = scanto(p, &mm->will_message);
-      }
-      if (mm->connect_flags & MG_MQTT_HAS_USER_NAME) {
-        if (p >= end) return MG_MQTT_ERROR_MALFORMED_MSG;
-        p = scanto(p, &mm->user_name);
-      }
-      if (mm->connect_flags & MG_MQTT_HAS_PASSWORD) {
-        if (p >= end) return MG_MQTT_ERROR_MALFORMED_MSG;
-        p = scanto(p, &mm->password);
-      }
-      if (p != end) return MG_MQTT_ERROR_MALFORMED_MSG;
-
-      LOG(LL_DEBUG,
-          ("%d %2x %d proto [%.*s] client_id [%.*s] will_topic [%.*s] "
-           "will_msg [%.*s] user_name [%.*s] password [%.*s]",
-           (int) len, (int) mm->connect_flags, (int) mm->keep_alive_timer,
-           (int) mm->protocol_name.len, mm->protocol_name.p,
-           (int) mm->client_id.len, mm->client_id.p, (int) mm->will_topic.len,
-           mm->will_topic.p, (int) mm->will_message.len, mm->will_message.p,
-           (int) mm->user_name.len, mm->user_name.p, (int) mm->password.len,
-           mm->password.p));
-      break;
-    }
-    case MG_MQTT_CMD_CONNACK:
-      if (end - p < 2) return MG_MQTT_ERROR_MALFORMED_MSG;
-      mm->connack_ret_code = p[1];
-      break;
-    case MG_MQTT_CMD_PUBACK:
-    case MG_MQTT_CMD_PUBREC:
-    case MG_MQTT_CMD_PUBREL:
-    case MG_MQTT_CMD_PUBCOMP:
-    case MG_MQTT_CMD_SUBACK:
-      if (end - p < 2) return MG_MQTT_ERROR_MALFORMED_MSG;
-      mm->message_id = getu16(p);
-      p += 2;
-      break;
-    case MG_MQTT_CMD_PUBLISH: {
-      p = scanto(p, &mm->topic);
-      if (p > end) return MG_MQTT_ERROR_MALFORMED_MSG;
-      if (mm->qos > 0) {
-        if (end - p < 2) return MG_MQTT_ERROR_MALFORMED_MSG;
-        mm->message_id = getu16(p);
-        p += 2;
-      }
-      mm->payload.p = p;
-      mm->payload.len = end - p;
-      break;
-    }
-    case MG_MQTT_CMD_SUBSCRIBE:
-      if (end - p < 2) return MG_MQTT_ERROR_MALFORMED_MSG;
-      mm->message_id = getu16(p);
-      p += 2;
-      /*
-       * topic expressions are left in the payload and can be parsed with
-       * `mg_mqtt_next_subscribe_topic`
-       */
-      mm->payload.p = p;
-      mm->payload.len = end - p;
-      break;
-    default:
-      /* Unhandled command */
-      break;
-  }
-
-  mm->len = end - io->buf;
-  return mm->len;
-}
-
-static void mqtt_handler(struct mg_connection *nc, int ev,
-                         void *ev_data MG_UD_ARG(void *user_data)) {
-  struct mbuf *io = &nc->recv_mbuf;
-  struct mg_mqtt_message mm;
-  memset(&mm, 0, sizeof(mm));
-
-  nc->handler(nc, ev, ev_data MG_UD_ARG(user_data));
-
-  switch (ev) {
-    case MG_EV_ACCEPT:
-      if (nc->proto_data == NULL) mg_set_protocol_mqtt(nc);
-      break;
-    case MG_EV_RECV: {
-      /* There can be multiple messages in the buffer, process them all. */
-      while (1) {
-        int len = parse_mqtt(io, &mm);
-        if (len < 0) {
-          if (len == MG_MQTT_ERROR_MALFORMED_MSG) {
-            /* Protocol error. */
-            nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-          } else if (len == MG_MQTT_ERROR_INCOMPLETE_MSG) {
-            /* Not fully buffered, let's check if we have a chance to get more
-             * data later */
-            if (nc->recv_mbuf_limit > 0 &&
-                nc->recv_mbuf.len >= nc->recv_mbuf_limit) {
-              LOG(LL_ERROR, ("%p recv buffer (%lu bytes) exceeds the limit "
-                             "%lu bytes, and not drained, closing",
-                             nc, (unsigned long) nc->recv_mbuf.len,
-                             (unsigned long) nc->recv_mbuf_limit));
-              nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-            }
-          } else {
-            /* Should never be here */
-            LOG(LL_ERROR, ("%p invalid len: %d, closing", nc, len));
-            nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-          }
-          break;
-        }
-        if (mm.cmd == MG_MQTT_CMD_PINGRESP) {
-          LOG(LL_DEBUG, ("Recv PINGRESP"));
-          nc->flags &= ~MG_F_MQTT_PING_PENDING;
-        }
-
-        nc->handler(nc, MG_MQTT_EVENT_BASE + mm.cmd, &mm MG_UD_ARG(user_data));
-        mbuf_remove(io, len);
-      }
-      break;
-    }
-    case MG_EV_POLL: {
-      struct mg_mqtt_proto_data *pd =
-          (struct mg_mqtt_proto_data *) nc->proto_data;
-      double now = mg_time();
-      if (pd->keep_alive > 0 && pd->last_control_time > 0) {
-        double diff = (now - pd->last_control_time);
-        if (diff > pd->keep_alive) {
-          if (diff < 1500000000) {
-            if (!(nc->flags & MG_F_MQTT_PING_PENDING)) {
-              LOG(LL_DEBUG, ("Send PINGREQ"));
-              nc->flags |= MG_F_MQTT_PING_PENDING;
-              mg_mqtt_ping(nc);
-            } else {
-              LOG(LL_DEBUG, ("Ping timeout"));
-              nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-            }
-          } else {
-            /* Wall time has just been set. Avoid immediate ping,
-             * more likely than not it is not needed. The standard allows for
-             * 1.5X interval for ping requests, so even if were just about to
-             * send one, we should be ok waiting 0.4X more. */
-            pd->last_control_time = now - pd->keep_alive * 0.6;
-          }
-        }
-      }
-      break;
-    }
-  }
-}
-
-static void mg_mqtt_proto_data_destructor(void *proto_data) {
-  MG_FREE(proto_data);
-}
-
-static struct mg_str mg_mqtt_next_topic_component(struct mg_str *topic) {
-  struct mg_str res = *topic;
-  const char *c = mg_strchr(*topic, '/');
-  if (c != NULL) {
-    res.len = (c - topic->p);
-    topic->len -= (res.len + 1);
-    topic->p += (res.len + 1);
-  } else {
-    topic->len = 0;
-  }
-  return res;
-}
-
-/* Refernce: https://mosquitto.org/man/mqtt-7.html */
-int mg_mqtt_match_topic_expression(struct mg_str exp, struct mg_str topic) {
-  struct mg_str ec, tc;
-  if (exp.len == 0) return 0;
-  while (1) {
-    ec = mg_mqtt_next_topic_component(&exp);
-    tc = mg_mqtt_next_topic_component(&topic);
-    if (ec.len == 0) {
-      if (tc.len != 0) return 0;
-      if (exp.len == 0) break;
-      continue;
-    }
-    if (mg_vcmp(&ec, "+") == 0) {
-      if (tc.len == 0 && topic.len == 0) return 0;
-      continue;
-    }
-    if (mg_vcmp(&ec, "#") == 0) {
-      /* Must be the last component in the expression or it's invalid. */
-      return (exp.len == 0);
-    }
-    if (mg_strcmp(ec, tc) != 0) {
-      return 0;
-    }
-  }
-  return (tc.len == 0 && topic.len == 0);
-}
-
-int mg_mqtt_vmatch_topic_expression(const char *exp, struct mg_str topic) {
-  return mg_mqtt_match_topic_expression(mg_mk_str(exp), topic);
-}
-
-void mg_set_protocol_mqtt(struct mg_connection *nc) {
-  nc->proto_handler = mqtt_handler;
-  nc->proto_data = MG_CALLOC(1, sizeof(struct mg_mqtt_proto_data));
-  nc->proto_data_destructor = mg_mqtt_proto_data_destructor;
-}
-
-static void mg_send_mqtt_header(struct mg_connection *nc, uint8_t cmd,
-                                uint8_t flags, size_t len) {
-  struct mg_mqtt_proto_data *pd = (struct mg_mqtt_proto_data *) nc->proto_data;
-  uint8_t buf[1 + sizeof(size_t)];
-  uint8_t *vlen = &buf[1];
-
-  buf[0] = (cmd << 4) | flags;
-
-  /* mqtt variable length encoding */
-  do {
-    *vlen = len % 0x80;
-    len /= 0x80;
-    if (len > 0) *vlen |= 0x80;
-    vlen++;
-  } while (len > 0);
-
-  mg_send(nc, buf, vlen - buf);
-  pd->last_control_time = mg_time();
-}
-
-void mg_send_mqtt_handshake(struct mg_connection *nc, const char *client_id) {
-  static struct mg_send_mqtt_handshake_opts opts;
-  mg_send_mqtt_handshake_opt(nc, client_id, opts);
-}
-
-void mg_send_mqtt_handshake_opt(struct mg_connection *nc, const char *client_id,
-                                struct mg_send_mqtt_handshake_opts opts) {
-  struct mg_mqtt_proto_data *pd = (struct mg_mqtt_proto_data *) nc->proto_data;
-  uint16_t id_len = 0, wt_len = 0, wm_len = 0, user_len = 0, pw_len = 0;
-  uint16_t netbytes;
-  size_t total_len;
-
-  if (client_id != NULL) {
-    id_len = strlen(client_id);
-  }
-
-  total_len = 7 + 1 + 2 + 2 + id_len;
-
-  if (opts.user_name != NULL) {
-    opts.flags |= MG_MQTT_HAS_USER_NAME;
-  }
-  if (opts.password != NULL) {
-    opts.flags |= MG_MQTT_HAS_PASSWORD;
-  }
-  if (opts.will_topic != NULL && opts.will_message != NULL) {
-    wt_len = strlen(opts.will_topic);
-    wm_len = strlen(opts.will_message);
-    opts.flags |= MG_MQTT_HAS_WILL;
-  }
-  if (opts.keep_alive == 0) {
-    opts.keep_alive = 60;
-  }
-
-  if (opts.flags & MG_MQTT_HAS_WILL) {
-    total_len += 2 + wt_len + 2 + wm_len;
-  }
-  if (opts.flags & MG_MQTT_HAS_USER_NAME) {
-    user_len = strlen(opts.user_name);
-    total_len += 2 + user_len;
-  }
-  if (opts.flags & MG_MQTT_HAS_PASSWORD) {
-    pw_len = strlen(opts.password);
-    total_len += 2 + pw_len;
-  }
-
-  mg_send_mqtt_header(nc, MG_MQTT_CMD_CONNECT, 0, total_len);
-  mg_send(nc, "\00\04MQTT\04", 7);
-  mg_send(nc, &opts.flags, 1);
-
-  netbytes = htons(opts.keep_alive);
-  mg_send(nc, &netbytes, 2);
-
-  netbytes = htons(id_len);
-  mg_send(nc, &netbytes, 2);
-  mg_send(nc, client_id, id_len);
-
-  if (opts.flags & MG_MQTT_HAS_WILL) {
-    netbytes = htons(wt_len);
-    mg_send(nc, &netbytes, 2);
-    mg_send(nc, opts.will_topic, wt_len);
-
-    netbytes = htons(wm_len);
-    mg_send(nc, &netbytes, 2);
-    mg_send(nc, opts.will_message, wm_len);
-  }
-
-  if (opts.flags & MG_MQTT_HAS_USER_NAME) {
-    netbytes = htons(user_len);
-    mg_send(nc, &netbytes, 2);
-    mg_send(nc, opts.user_name, user_len);
-  }
-  if (opts.flags & MG_MQTT_HAS_PASSWORD) {
-    netbytes = htons(pw_len);
-    mg_send(nc, &netbytes, 2);
-    mg_send(nc, opts.password, pw_len);
-  }
-
-  if (pd != NULL) {
-    pd->keep_alive = opts.keep_alive;
-  }
-}
-
-void mg_mqtt_publish(struct mg_connection *nc, const char *topic,
-                     uint16_t message_id, int flags, const void *data,
-                     size_t len) {
-  uint16_t netbytes;
-  uint16_t topic_len = strlen(topic);
-
-  size_t total_len = 2 + topic_len + len;
-  if (MG_MQTT_GET_QOS(flags) > 0) {
-    total_len += 2;
-  }
-
-  mg_send_mqtt_header(nc, MG_MQTT_CMD_PUBLISH, flags, total_len);
-
-  netbytes = htons(topic_len);
-  mg_send(nc, &netbytes, 2);
-  mg_send(nc, topic, topic_len);
-
-  if (MG_MQTT_GET_QOS(flags) > 0) {
-    netbytes = htons(message_id);
-    mg_send(nc, &netbytes, 2);
-  }
-
-  mg_send(nc, data, len);
-}
-
-void mg_mqtt_subscribe(struct mg_connection *nc,
-                       const struct mg_mqtt_topic_expression *topics,
-                       size_t topics_len, uint16_t message_id) {
-  uint16_t netbytes;
-  size_t i;
-  uint16_t topic_len;
-  size_t total_len = 2;
-
-  for (i = 0; i < topics_len; i++) {
-    total_len += 2 + strlen(topics[i].topic) + 1;
-  }
-
-  mg_send_mqtt_header(nc, MG_MQTT_CMD_SUBSCRIBE, MG_MQTT_QOS(1), total_len);
-
-  netbytes = htons(message_id);
-  mg_send(nc, (char *) &netbytes, 2);
-
-  for (i = 0; i < topics_len; i++) {
-    topic_len = strlen(topics[i].topic);
-    netbytes = htons(topic_len);
-    mg_send(nc, &netbytes, 2);
-    mg_send(nc, topics[i].topic, topic_len);
-    mg_send(nc, &topics[i].qos, 1);
-  }
-}
-
-int mg_mqtt_next_subscribe_topic(struct mg_mqtt_message *msg,
-                                 struct mg_str *topic, uint8_t *qos, int pos) {
-  unsigned char *buf = (unsigned char *) msg->payload.p + pos;
-  int new_pos;
-
-  if ((size_t) pos >= msg->payload.len) return -1;
-
-  topic->len = buf[0] << 8 | buf[1];
-  topic->p = (char *) buf + 2;
-  new_pos = pos + 2 + topic->len + 1;
-  if ((size_t) new_pos > msg->payload.len) return -1;
-  *qos = buf[2 + topic->len];
-  return new_pos;
-}
-
-void mg_mqtt_unsubscribe(struct mg_connection *nc, char **topics,
-                         size_t topics_len, uint16_t message_id) {
-  uint16_t netbytes;
-  size_t i;
-  uint16_t topic_len;
-  size_t total_len = 2;
-
-  for (i = 0; i < topics_len; i++) {
-    total_len += 2 + strlen(topics[i]);
-  }
-
-  mg_send_mqtt_header(nc, MG_MQTT_CMD_UNSUBSCRIBE, MG_MQTT_QOS(1), total_len);
-
-  netbytes = htons(message_id);
-  mg_send(nc, (char *) &netbytes, 2);
-
-  for (i = 0; i < topics_len; i++) {
-    topic_len = strlen(topics[i]);
-    netbytes = htons(topic_len);
-    mg_send(nc, &netbytes, 2);
-    mg_send(nc, topics[i], topic_len);
-  }
-}
-
-void mg_mqtt_connack(struct mg_connection *nc, uint8_t return_code) {
-  uint8_t unused = 0;
-  mg_send_mqtt_header(nc, MG_MQTT_CMD_CONNACK, 0, 2);
-  mg_send(nc, &unused, 1);
-  mg_send(nc, &return_code, 1);
-}
-
-/*
- * Sends a command which contains only a `message_id` and a QoS level of 1.
- *
- * Helper function.
- */
-static void mg_send_mqtt_short_command(struct mg_connection *nc, uint8_t cmd,
-                                       uint16_t message_id) {
-  uint16_t netbytes;
-  uint8_t flags = (cmd == MG_MQTT_CMD_PUBREL ? 2 : 0);
-
-  mg_send_mqtt_header(nc, cmd, flags, 2 /* len */);
-
-  netbytes = htons(message_id);
-  mg_send(nc, &netbytes, 2);
-}
-
-void mg_mqtt_puback(struct mg_connection *nc, uint16_t message_id) {
-  mg_send_mqtt_short_command(nc, MG_MQTT_CMD_PUBACK, message_id);
-}
-
-void mg_mqtt_pubrec(struct mg_connection *nc, uint16_t message_id) {
-  mg_send_mqtt_short_command(nc, MG_MQTT_CMD_PUBREC, message_id);
-}
-
-void mg_mqtt_pubrel(struct mg_connection *nc, uint16_t message_id) {
-  mg_send_mqtt_short_command(nc, MG_MQTT_CMD_PUBREL, message_id);
-}
-
-void mg_mqtt_pubcomp(struct mg_connection *nc, uint16_t message_id) {
-  mg_send_mqtt_short_command(nc, MG_MQTT_CMD_PUBCOMP, message_id);
-}
-
-void mg_mqtt_suback(struct mg_connection *nc, uint8_t *qoss, size_t qoss_len,
-                    uint16_t message_id) {
-  size_t i;
-  uint16_t netbytes;
-
-  mg_send_mqtt_header(nc, MG_MQTT_CMD_SUBACK, MG_MQTT_QOS(1), 2 + qoss_len);
-
-  netbytes = htons(message_id);
-  mg_send(nc, &netbytes, 2);
-
-  for (i = 0; i < qoss_len; i++) {
-    mg_send(nc, &qoss[i], 1);
-  }
-}
-
-void mg_mqtt_unsuback(struct mg_connection *nc, uint16_t message_id) {
-  mg_send_mqtt_short_command(nc, MG_MQTT_CMD_UNSUBACK, message_id);
-}
-
-void mg_mqtt_ping(struct mg_connection *nc) {
-  mg_send_mqtt_header(nc, MG_MQTT_CMD_PINGREQ, 0, 0);
-}
-
-void mg_mqtt_pong(struct mg_connection *nc) {
-  mg_send_mqtt_header(nc, MG_MQTT_CMD_PINGRESP, 0, 0);
-}
-
-void mg_mqtt_disconnect(struct mg_connection *nc) {
-  mg_send_mqtt_header(nc, MG_MQTT_CMD_DISCONNECT, 0, 0);
-}
-
-#endif /* MG_ENABLE_MQTT */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_mqtt_server.c"
-#endif
-
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_mqtt_server.h" */
-
-#if MG_ENABLE_MQTT_BROKER
-
-static void mg_mqtt_session_init(struct mg_mqtt_broker *brk,
-                                 struct mg_mqtt_session *s,
-                                 struct mg_connection *nc) {
-  s->brk = brk;
-  s->subscriptions = NULL;
-  s->num_subscriptions = 0;
-  s->nc = nc;
-}
-
-static void mg_mqtt_add_session(struct mg_mqtt_session *s) {
-  LIST_INSERT_HEAD(&s->brk->sessions, s, link);
-}
-
-static void mg_mqtt_remove_session(struct mg_mqtt_session *s) {
-  LIST_REMOVE(s, link);
-}
-
-static void mg_mqtt_destroy_session(struct mg_mqtt_session *s) {
-  size_t i;
-  for (i = 0; i < s->num_subscriptions; i++) {
-    MG_FREE((void *) s->subscriptions[i].topic);
-  }
-  MG_FREE(s->subscriptions);
-  MG_FREE(s);
-}
-
-static void mg_mqtt_close_session(struct mg_mqtt_session *s) {
-  mg_mqtt_remove_session(s);
-  mg_mqtt_destroy_session(s);
-}
-
-void mg_mqtt_broker_init(struct mg_mqtt_broker *brk, void *user_data) {
-  LIST_INIT(&brk->sessions);
-  brk->user_data = user_data;
-}
-
-static void mg_mqtt_broker_handle_connect(struct mg_mqtt_broker *brk,
-                                          struct mg_connection *nc) {
-  struct mg_mqtt_session *s =
-      (struct mg_mqtt_session *) MG_CALLOC(1, sizeof *s);
-  if (s == NULL) {
-    /* LCOV_EXCL_START */
-    mg_mqtt_connack(nc, MG_EV_MQTT_CONNACK_SERVER_UNAVAILABLE);
-    return;
-    /* LCOV_EXCL_STOP */
-  }
-
-  /* TODO(mkm): check header (magic and version) */
-
-  mg_mqtt_session_init(brk, s, nc);
-  nc->priv_2 = s;
-  mg_mqtt_add_session(s);
-
-  mg_mqtt_connack(nc, MG_EV_MQTT_CONNACK_ACCEPTED);
-}
-
-static void mg_mqtt_broker_handle_subscribe(struct mg_connection *nc,
-                                            struct mg_mqtt_message *msg) {
-  struct mg_mqtt_session *ss = (struct mg_mqtt_session *) nc->priv_2;
-  uint8_t qoss[MG_MQTT_MAX_SESSION_SUBSCRIPTIONS];
-  size_t num_subs = 0;
-  struct mg_str topic;
-  uint8_t qos;
-  int pos;
-  struct mg_mqtt_topic_expression *te;
-
-  for (pos = 0;
-       (pos = mg_mqtt_next_subscribe_topic(msg, &topic, &qos, pos)) != -1;) {
-    if (num_subs >= sizeof(MG_MQTT_MAX_SESSION_SUBSCRIPTIONS) ||
-        (ss->num_subscriptions + num_subs >=
-         MG_MQTT_MAX_SESSION_SUBSCRIPTIONS)) {
-      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      return;
-    }
-    qoss[num_subs++] = qos;
-  }
-
-  if (num_subs > 0) {
-    te = (struct mg_mqtt_topic_expression *) MG_REALLOC(
-        ss->subscriptions,
-        sizeof(*ss->subscriptions) * (ss->num_subscriptions + num_subs));
-    if (te == NULL) {
-      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      return;
-    }
-    ss->subscriptions = te;
-    for (pos = 0;
-         pos < (int) msg->payload.len &&
-             (pos = mg_mqtt_next_subscribe_topic(msg, &topic, &qos, pos)) != -1;
-         ss->num_subscriptions++) {
-      te = &ss->subscriptions[ss->num_subscriptions];
-      te->topic = (char *) MG_MALLOC(topic.len + 1);
-      te->qos = qos;
-      memcpy((char *) te->topic, topic.p, topic.len);
-      ((char *) te->topic)[topic.len] = '\0';
-    }
-  }
-
-  if (pos == (int) msg->payload.len) {
-    mg_mqtt_suback(nc, qoss, num_subs, msg->message_id);
-  } else {
-    /* We did not fully parse the payload, something must be wrong. */
-    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-  }
-}
-
-static void mg_mqtt_broker_handle_publish(struct mg_mqtt_broker *brk,
-                                          struct mg_mqtt_message *msg) {
-  struct mg_mqtt_session *s;
-  size_t i;
-
-  for (s = mg_mqtt_next(brk, NULL); s != NULL; s = mg_mqtt_next(brk, s)) {
-    for (i = 0; i < s->num_subscriptions; i++) {
-      if (mg_mqtt_vmatch_topic_expression(s->subscriptions[i].topic,
-                                          msg->topic)) {
-        char buf[100], *p = buf;
-        mg_asprintf(&p, sizeof(buf), "%.*s", (int) msg->topic.len,
-                    msg->topic.p);
-        if (p == NULL) {
-          return;
-        }
-        mg_mqtt_publish(s->nc, p, 0, 0, msg->payload.p, msg->payload.len);
-        if (p != buf) {
-          MG_FREE(p);
-        }
-        break;
-      }
-    }
-  }
-}
-
-void mg_mqtt_broker(struct mg_connection *nc, int ev, void *data) {
-  struct mg_mqtt_message *msg = (struct mg_mqtt_message *) data;
-  struct mg_mqtt_broker *brk;
-
-  if (nc->listener) {
-    brk = (struct mg_mqtt_broker *) nc->listener->priv_2;
-  } else {
-    brk = (struct mg_mqtt_broker *) nc->priv_2;
-  }
-
-  switch (ev) {
-    case MG_EV_ACCEPT:
-      if (nc->proto_data == NULL) mg_set_protocol_mqtt(nc);
-      nc->priv_2 = NULL; /* Clear up the inherited pointer to broker */
-      break;
-    case MG_EV_MQTT_CONNECT:
-      if (nc->priv_2 == NULL) {
-        mg_mqtt_broker_handle_connect(brk, nc);
-      } else {
-        /* Repeated CONNECT */
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      }
-      break;
-    case MG_EV_MQTT_SUBSCRIBE:
-      if (nc->priv_2 != NULL) {
-        mg_mqtt_broker_handle_subscribe(nc, msg);
-      } else {
-        /* Subscribe before CONNECT */
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      }
-      break;
-    case MG_EV_MQTT_PUBLISH:
-      if (nc->priv_2 != NULL) {
-        mg_mqtt_broker_handle_publish(brk, msg);
-      } else {
-        /* Publish before CONNECT */
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      }
-      break;
-    case MG_EV_CLOSE:
-      if (nc->listener && nc->priv_2 != NULL) {
-        mg_mqtt_close_session((struct mg_mqtt_session *) nc->priv_2);
-      }
-      break;
-  }
-}
-
-struct mg_mqtt_session *mg_mqtt_next(struct mg_mqtt_broker *brk,
-                                     struct mg_mqtt_session *s) {
-  return s == NULL ? LIST_FIRST(&brk->sessions) : LIST_NEXT(s, link);
-}
-
-#endif /* MG_ENABLE_MQTT_BROKER */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_dns.c"
-#endif
-
-#if MG_ENABLE_DNS
-
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_dns.h" */
-
-static int mg_dns_tid = 0xa0;
-
-struct mg_dns_header {
-  uint16_t transaction_id;
-  uint16_t flags;
-  uint16_t num_questions;
-  uint16_t num_answers;
-  uint16_t num_authority_prs;
-  uint16_t num_other_prs;
-};
-
-struct mg_dns_resource_record *mg_dns_next_record(
-    struct mg_dns_message *msg, int query,
-    struct mg_dns_resource_record *prev) {
-  struct mg_dns_resource_record *rr;
-
-  for (rr = (prev == NULL ? msg->answers : prev + 1);
-       rr - msg->answers < msg->num_answers; rr++) {
-    if (rr->rtype == query) {
-      return rr;
-    }
-  }
-  return NULL;
-}
-
-int mg_dns_parse_record_data(struct mg_dns_message *msg,
-                             struct mg_dns_resource_record *rr, void *data,
-                             size_t data_len) {
-  switch (rr->rtype) {
-    case MG_DNS_A_RECORD:
-      if (data_len < sizeof(struct in_addr)) {
-        return -1;
-      }
-      if (rr->rdata.p + data_len > msg->pkt.p + msg->pkt.len) {
-        return -1;
-      }
-      memcpy(data, rr->rdata.p, data_len);
-      return 0;
-#if MG_ENABLE_IPV6
-    case MG_DNS_AAAA_RECORD:
-      if (data_len < sizeof(struct in6_addr)) {
-        return -1; /* LCOV_EXCL_LINE */
-      }
-      memcpy(data, rr->rdata.p, data_len);
-      return 0;
-#endif
-    case MG_DNS_CNAME_RECORD:
-      mg_dns_uncompress_name(msg, &rr->rdata, (char *) data, data_len);
-      return 0;
-  }
-
-  return -1;
-}
-
-int mg_dns_insert_header(struct mbuf *io, size_t pos,
-                         struct mg_dns_message *msg) {
-  struct mg_dns_header header;
-
-  memset(&header, 0, sizeof(header));
-  header.transaction_id = msg->transaction_id;
-  header.flags = htons(msg->flags);
-  header.num_questions = htons(msg->num_questions);
-  header.num_answers = htons(msg->num_answers);
-
-  return mbuf_insert(io, pos, &header, sizeof(header));
-}
-
-int mg_dns_copy_questions(struct mbuf *io, struct mg_dns_message *msg) {
-  unsigned char *begin, *end;
-  struct mg_dns_resource_record *last_q;
-  if (msg->num_questions <= 0) return 0;
-  begin = (unsigned char *) msg->pkt.p + sizeof(struct mg_dns_header);
-  last_q = &msg->questions[msg->num_questions - 1];
-  end = (unsigned char *) last_q->name.p + last_q->name.len + 4;
-  return mbuf_append(io, begin, end - begin);
-}
-
-int mg_dns_encode_name_s(struct mbuf *io, struct mg_str name) {
-  const char *s;
-  unsigned char n;
-  size_t pos = io->len;
-
-  do {
-    if ((s = mg_strchr(name, '.')) == NULL) {
-      s = name.p + name.len;
-    }
-
-    if (s - name.p > 127) {
-      return -1; /* TODO(mkm) cover */
-    }
-    n = s - name.p;         /* chunk length */
-    mbuf_append(io, &n, 1); /* send length */
-    mbuf_append(io, name.p, n);
-
-    if (n < name.len && *s == '.') {
-      n++;
-    }
-
-    name.p += n;
-    name.len -= n;
-  } while (name.len > 0);
-  mbuf_append(io, "\0", 1); /* Mark end of host name */
-
-  return io->len - pos;
-}
-
-int mg_dns_encode_name(struct mbuf *io, const char *name, size_t len) {
-  return mg_dns_encode_name_s(io, mg_mk_str_n(name, len));
-}
-
-int mg_dns_encode_record(struct mbuf *io, struct mg_dns_resource_record *rr,
-                         const char *name, size_t nlen, const void *rdata,
-                         size_t rlen) {
-  size_t pos = io->len;
-  uint16_t u16;
-  uint32_t u32;
-
-  if (rr->kind == MG_DNS_INVALID_RECORD) {
-    return -1; /* LCOV_EXCL_LINE */
-  }
-
-  if (mg_dns_encode_name(io, name, nlen) == -1) {
-    return -1;
-  }
-
-  u16 = htons(rr->rtype);
-  mbuf_append(io, &u16, 2);
-  u16 = htons(rr->rclass);
-  mbuf_append(io, &u16, 2);
-
-  if (rr->kind == MG_DNS_ANSWER) {
-    u32 = htonl(rr->ttl);
-    mbuf_append(io, &u32, 4);
-
-    if (rr->rtype == MG_DNS_CNAME_RECORD) {
-      int clen;
-      /* fill size after encoding */
-      size_t off = io->len;
-      mbuf_append(io, &u16, 2);
-      if ((clen = mg_dns_encode_name(io, (const char *) rdata, rlen)) == -1) {
-        return -1;
-      }
-      u16 = clen;
-      io->buf[off] = u16 >> 8;
-      io->buf[off + 1] = u16 & 0xff;
-    } else {
-      u16 = htons((uint16_t) rlen);
-      mbuf_append(io, &u16, 2);
-      mbuf_append(io, rdata, rlen);
-    }
-  }
-
-  return io->len - pos;
-}
-
-void mg_send_dns_query(struct mg_connection *nc, const char *name,
-                       int query_type) {
-  struct mg_dns_message *msg =
-      (struct mg_dns_message *) MG_CALLOC(1, sizeof(*msg));
-  struct mbuf pkt;
-  struct mg_dns_resource_record *rr = &msg->questions[0];
-
-  DBG(("%s %d", name, query_type));
-
-  mbuf_init(&pkt, 64 /* Start small, it'll grow as needed. */);
-
-  msg->transaction_id = ++mg_dns_tid;
-  msg->flags = 0x100;
-  msg->num_questions = 1;
-
-  mg_dns_insert_header(&pkt, 0, msg);
-
-  rr->rtype = query_type;
-  rr->rclass = 1; /* Class: inet */
-  rr->kind = MG_DNS_QUESTION;
-
-  if (mg_dns_encode_record(&pkt, rr, name, strlen(name), NULL, 0) == -1) {
-    /* TODO(mkm): return an error code */
-    goto cleanup; /* LCOV_EXCL_LINE */
-  }
-
-  /* TCP DNS requires messages to be prefixed with len */
-  if (!(nc->flags & MG_F_UDP)) {
-    uint16_t len = htons((uint16_t) pkt.len);
-    mbuf_insert(&pkt, 0, &len, 2);
-  }
-
-  mg_send(nc, pkt.buf, pkt.len);
-  mbuf_free(&pkt);
-
-cleanup:
-  MG_FREE(msg);
-}
-
-static unsigned char *mg_parse_dns_resource_record(
-    unsigned char *data, unsigned char *end, struct mg_dns_resource_record *rr,
-    int reply) {
-  unsigned char *name = data;
-  int chunk_len, data_len;
-
-  while (data < end && (chunk_len = *data)) {
-    if (((unsigned char *) data)[0] & 0xc0) {
-      data += 1;
-      break;
-    }
-    data += chunk_len + 1;
-  }
-
-  if (data > end - 5) {
-    return NULL;
-  }
-
-  rr->name.p = (char *) name;
-  rr->name.len = data - name + 1;
-  data++;
-
-  rr->rtype = data[0] << 8 | data[1];
-  data += 2;
-
-  rr->rclass = data[0] << 8 | data[1];
-  data += 2;
-
-  rr->kind = reply ? MG_DNS_ANSWER : MG_DNS_QUESTION;
-  if (reply) {
-    if (data >= end - 6) {
-      return NULL;
-    }
-
-    rr->ttl = (uint32_t) data[0] << 24 | (uint32_t) data[1] << 16 |
-              data[2] << 8 | data[3];
-    data += 4;
-
-    data_len = *data << 8 | *(data + 1);
-    data += 2;
-
-    rr->rdata.p = (char *) data;
-    rr->rdata.len = data_len;
-    data += data_len;
-  }
-  return data;
-}
-
-int mg_parse_dns(const char *buf, int len, struct mg_dns_message *msg) {
-  struct mg_dns_header *header = (struct mg_dns_header *) buf;
-  unsigned char *data = (unsigned char *) buf + sizeof(*header);
-  unsigned char *end = (unsigned char *) buf + len;
-  int i;
-
-  memset(msg, 0, sizeof(*msg));
-  msg->pkt.p = buf;
-  msg->pkt.len = len;
-
-  if (len < (int) sizeof(*header)) return -1;
-
-  msg->transaction_id = header->transaction_id;
-  msg->flags = ntohs(header->flags);
-  msg->num_questions = ntohs(header->num_questions);
-  if (msg->num_questions > (int) ARRAY_SIZE(msg->questions)) {
-    msg->num_questions = (int) ARRAY_SIZE(msg->questions);
-  }
-  msg->num_answers = ntohs(header->num_answers);
-  if (msg->num_answers > (int) ARRAY_SIZE(msg->answers)) {
-    msg->num_answers = (int) ARRAY_SIZE(msg->answers);
-  }
-
-  for (i = 0; i < msg->num_questions; i++) {
-    data = mg_parse_dns_resource_record(data, end, &msg->questions[i], 0);
-    if (data == NULL) return -1;
-  }
-
-  for (i = 0; i < msg->num_answers; i++) {
-    data = mg_parse_dns_resource_record(data, end, &msg->answers[i], 1);
-    if (data == NULL) return -1;
-  }
-
-  return 0;
-}
-
-size_t mg_dns_uncompress_name(struct mg_dns_message *msg, struct mg_str *name,
-                              char *dst, int dst_len) {
-  int chunk_len, num_ptrs = 0;
-  char *old_dst = dst;
-  const unsigned char *data = (unsigned char *) name->p;
-  const unsigned char *end = (unsigned char *) msg->pkt.p + msg->pkt.len;
-
-  if (data >= end) {
-    return 0;
-  }
-
-  while ((chunk_len = *data++)) {
-    int leeway = dst_len - (dst - old_dst);
-    if (data >= end) {
-      return 0;
-    }
-
-    if ((chunk_len & 0xc0) == 0xc0) {
-      uint16_t off = (data[-1] & (~0xc0)) << 8 | data[0];
-      if (off >= msg->pkt.len) {
-        return 0;
-      }
-      /* Basic circular loop avoidance: allow up to 16 pointer hops. */
-      if (++num_ptrs > 15) {
-        return 0;
-      }
-      data = (unsigned char *) msg->pkt.p + off;
-      continue;
-    }
-    if (chunk_len > 63) {
-      return 0;
-    }
-    if (chunk_len > leeway) {
-      chunk_len = leeway;
-    }
-
-    if (data + chunk_len >= end) {
-      return 0;
-    }
-
-    memcpy(dst, data, chunk_len);
-    data += chunk_len;
-    dst += chunk_len;
-    leeway -= chunk_len;
-    if (leeway == 0) {
-      return dst - old_dst;
-    }
-    *dst++ = '.';
-  }
-
-  if (dst != old_dst) {
-    *--dst = 0;
-  }
-  return dst - old_dst;
-}
-
-static void dns_handler(struct mg_connection *nc, int ev,
-                        void *ev_data MG_UD_ARG(void *user_data)) {
-  struct mbuf *io = &nc->recv_mbuf;
-  struct mg_dns_message msg;
-
-  /* Pass low-level events to the user handler */
-  nc->handler(nc, ev, ev_data MG_UD_ARG(user_data));
-
-  switch (ev) {
-    case MG_EV_RECV:
-      if (!(nc->flags & MG_F_UDP)) {
-        mbuf_remove(&nc->recv_mbuf, 2);
-      }
-      if (mg_parse_dns(nc->recv_mbuf.buf, nc->recv_mbuf.len, &msg) == -1) {
-        /* reply + recursion allowed + format error */
-        memset(&msg, 0, sizeof(msg));
-        msg.flags = 0x8081;
-        mg_dns_insert_header(io, 0, &msg);
-        if (!(nc->flags & MG_F_UDP)) {
-          uint16_t len = htons((uint16_t) io->len);
-          mbuf_insert(io, 0, &len, 2);
-        }
-        mg_send(nc, io->buf, io->len);
-      } else {
-        /* Call user handler with parsed message */
-        nc->handler(nc, MG_DNS_MESSAGE, &msg MG_UD_ARG(user_data));
-      }
-      mbuf_remove(io, io->len);
-      break;
-  }
-}
-
-void mg_set_protocol_dns(struct mg_connection *nc) {
-  nc->proto_handler = dns_handler;
-}
-
-#endif /* MG_ENABLE_DNS */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_dns_server.c"
-#endif
-
-#if MG_ENABLE_DNS_SERVER
-
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "dns-server.h" */
-
-struct mg_dns_reply mg_dns_create_reply(struct mbuf *io,
-                                        struct mg_dns_message *msg) {
-  struct mg_dns_reply rep;
-  rep.msg = msg;
-  rep.io = io;
-  rep.start = io->len;
-
-  /* reply + recursion allowed */
-  msg->flags |= 0x8080;
-  mg_dns_copy_questions(io, msg);
-
-  msg->num_answers = 0;
-  return rep;
-}
-
-void mg_dns_send_reply(struct mg_connection *nc, struct mg_dns_reply *r) {
-  size_t sent = r->io->len - r->start;
-  mg_dns_insert_header(r->io, r->start, r->msg);
-  if (!(nc->flags & MG_F_UDP)) {
-    uint16_t len = htons((uint16_t) sent);
-    mbuf_insert(r->io, r->start, &len, 2);
-  }
-
-  if (&nc->send_mbuf != r->io) {
-    mg_send(nc, r->io->buf + r->start, r->io->len - r->start);
-    r->io->len = r->start;
-  }
-}
-
-int mg_dns_reply_record(struct mg_dns_reply *reply,
-                        struct mg_dns_resource_record *question,
-                        const char *name, int rtype, int ttl, const void *rdata,
-                        size_t rdata_len) {
-  struct mg_dns_message *msg = (struct mg_dns_message *) reply->msg;
-  char rname[512];
-  struct mg_dns_resource_record *ans = &msg->answers[msg->num_answers];
-  if (msg->num_answers >= MG_MAX_DNS_ANSWERS) {
-    return -1; /* LCOV_EXCL_LINE */
-  }
-
-  if (name == NULL) {
-    name = rname;
-    rname[511] = 0;
-    mg_dns_uncompress_name(msg, &question->name, rname, sizeof(rname) - 1);
-  }
-
-  *ans = *question;
-  ans->kind = MG_DNS_ANSWER;
-  ans->rtype = rtype;
-  ans->ttl = ttl;
-
-  if (mg_dns_encode_record(reply->io, ans, name, strlen(name), rdata,
-                           rdata_len) == -1) {
-    return -1; /* LCOV_EXCL_LINE */
-  };
-
-  msg->num_answers++;
-  return 0;
-}
-
-#endif /* MG_ENABLE_DNS_SERVER */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_resolv.c"
-#endif
-
-#if MG_ENABLE_ASYNC_RESOLVER
-
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_resolv.h" */
-
-#ifndef MG_DEFAULT_NAMESERVER
-#define MG_DEFAULT_NAMESERVER "8.8.8.8"
-#endif
-
-struct mg_resolve_async_request {
-  char name[1024];
-  int query;
-  mg_resolve_callback_t callback;
-  void *data;
-  time_t timeout;
-  int max_retries;
-  enum mg_resolve_err err;
-
-  /* state */
-  time_t last_time;
-  int retries;
-};
-
-/*
- * Find what nameserver to use.
- *
- * Return 0 if OK, -1 if error
- */
-static int mg_get_ip_address_of_nameserver(char *name, size_t name_len) {
-  int ret = -1;
-
-#ifdef _WIN32
-  int i;
-  LONG err;
-  HKEY hKey, hSub;
-  wchar_t subkey[512], value[128],
-      *key = L"SYSTEM\\ControlSet001\\Services\\Tcpip\\Parameters\\Interfaces";
-
-  if ((err = RegOpenKeyExW(HKEY_LOCAL_MACHINE, key, 0, KEY_READ, &hKey)) !=
-      ERROR_SUCCESS) {
-    fprintf(stderr, "cannot open reg key %S: %ld\n", key, err);
-    ret = -1;
-  } else {
-    for (ret = -1, i = 0; 1; i++) {
-      DWORD subkey_size = sizeof(subkey), type, len = sizeof(value);
-      if (RegEnumKeyExW(hKey, i, subkey, &subkey_size, NULL, NULL, NULL,
-                        NULL) != ERROR_SUCCESS) {
-        break;
-      }
-      if (RegOpenKeyExW(hKey, subkey, 0, KEY_READ, &hSub) == ERROR_SUCCESS &&
-          ((RegQueryValueExW(hSub, L"NameServer", 0, &type, (void *) value,
-                             &len) == ERROR_SUCCESS &&
-            value[0] != '\0') ||
-           (RegQueryValueExW(hSub, L"DhcpNameServer", 0, &type, (void *) value,
-                             &len) == ERROR_SUCCESS &&
-            value[0] != '\0'))) {
-        /*
-         * See https://github.com/cesanta/mongoose/issues/176
-         * The value taken from the registry can be empty, a single
-         * IP address, or multiple IP addresses separated by comma.
-         * If it's empty, check the next interface.
-         * If it's multiple IP addresses, take the first one.
-         */
-        wchar_t *comma = wcschr(value, ',');
-        if (comma != NULL) {
-          *comma = '\0';
-        }
-        /* %S will convert wchar_t -> char */
-        snprintf(name, name_len, "%S", value);
-        ret = 0;
-        RegCloseKey(hSub);
-        break;
-      }
-    }
-    RegCloseKey(hKey);
-  }
-#elif MG_ENABLE_FILESYSTEM && defined(MG_RESOLV_CONF_FILE_NAME)
-  FILE *fp;
-  char line[512];
-
-  if ((fp = mg_fopen(MG_RESOLV_CONF_FILE_NAME, "r")) == NULL) {
-    ret = -1;
-  } else {
-    /* Try to figure out what nameserver to use */
-    for (ret = -1; fgets(line, sizeof(line), fp) != NULL;) {
-      unsigned int a, b, c, d;
-      if (sscanf(line, "nameserver %u.%u.%u.%u", &a, &b, &c, &d) == 4) {
-        snprintf(name, name_len, "%u.%u.%u.%u", a, b, c, d);
-        ret = 0;
-        break;
-      }
-    }
-    (void) fclose(fp);
-  }
-#else
-  snprintf(name, name_len, "%s", MG_DEFAULT_NAMESERVER);
-#endif /* _WIN32 */
-
-  return ret;
-}
-
-int mg_resolve_from_hosts_file(const char *name, union socket_address *usa) {
-#if MG_ENABLE_FILESYSTEM && defined(MG_HOSTS_FILE_NAME)
-  /* TODO(mkm) cache /etc/hosts */
-  FILE *fp;
-  char line[1024];
-  char *p;
-  char alias[256];
-  unsigned int a, b, c, d;
-  int len = 0;
-
-  if ((fp = mg_fopen(MG_HOSTS_FILE_NAME, "r")) == NULL) {
-    return -1;
-  }
-
-  for (; fgets(line, sizeof(line), fp) != NULL;) {
-    if (line[0] == '#') continue;
-
-    if (sscanf(line, "%u.%u.%u.%u%n", &a, &b, &c, &d, &len) == 0) {
-      /* TODO(mkm): handle ipv6 */
-      continue;
-    }
-    for (p = line + len; sscanf(p, "%s%n", alias, &len) == 1; p += len) {
-      if (strcmp(alias, name) == 0) {
-        usa->sin.sin_addr.s_addr = htonl(a << 24 | b << 16 | c << 8 | d);
-        fclose(fp);
-        return 0;
-      }
-    }
-  }
-
-  fclose(fp);
-#else
-  (void) name;
-  (void) usa;
-#endif
-
-  return -1;
-}
-
-static void mg_resolve_async_eh(struct mg_connection *nc, int ev,
-                                void *data MG_UD_ARG(void *user_data)) {
-  time_t now = (time_t) mg_time();
-  struct mg_resolve_async_request *req;
-  struct mg_dns_message *msg;
-#if !MG_ENABLE_CALLBACK_USERDATA
-  void *user_data = nc->user_data;
-#endif
-
-  if (ev != MG_EV_POLL) {
-    DBG(("ev=%d user_data=%p", ev, user_data));
-  }
-
-  req = (struct mg_resolve_async_request *) user_data;
-
-  if (req == NULL) {
-    return;
-  }
-
-  switch (ev) {
-    case MG_EV_POLL:
-      if (req->retries > req->max_retries) {
-        req->err = MG_RESOLVE_EXCEEDED_RETRY_COUNT;
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-        break;
-      }
-      if (nc->flags & MG_F_CONNECTING) break;
-    /* fallthrough */
-    case MG_EV_CONNECT:
-      if (req->retries == 0 || now - req->last_time >= req->timeout) {
-        mg_send_dns_query(nc, req->name, req->query);
-        req->last_time = now;
-        req->retries++;
-      }
-      break;
-    case MG_EV_RECV:
-      msg = (struct mg_dns_message *) MG_MALLOC(sizeof(*msg));
-      if (mg_parse_dns(nc->recv_mbuf.buf, *(int *) data, msg) == 0 &&
-          msg->num_answers > 0) {
-        req->callback(msg, req->data, MG_RESOLVE_OK);
-        nc->user_data = NULL;
-        MG_FREE(req);
+int mg_url_decode(const char *src, size_t src_len, char *dst, size_t dst_len,
+                  int is_form_url_encoded) {
+  size_t i, j;
+  for (i = j = 0; i < src_len && j + 1 < dst_len; i++, j++) {
+    if (src[i] == '%') {
+      // Use `i + 2 < src_len`, not `i < src_len - 2`, note small src_len
+      if (i + 2 < src_len && isxdigit(*(const unsigned char *) (src + i + 1)) &&
+          isxdigit(*(const unsigned char *) (src + i + 2))) {
+        mg_unhex(src + i + 1, 2, (uint8_t *) &dst[j]);
+        i += 2;
       } else {
-        req->err = MG_RESOLVE_NO_ANSWERS;
-      }
-      MG_FREE(msg);
-      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      break;
-    case MG_EV_SEND:
-      /*
-       * If a send error occurs, prevent closing of the connection by the core.
-       * We will retry after timeout.
-       */
-      nc->flags &= ~MG_F_CLOSE_IMMEDIATELY;
-      mbuf_remove(&nc->send_mbuf, nc->send_mbuf.len);
-      break;
-    case MG_EV_TIMER:
-      req->err = MG_RESOLVE_TIMEOUT;
-      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      break;
-    case MG_EV_CLOSE:
-      /* If we got here with request still not done, fire an error callback. */
-      if (req != NULL) {
-        char addr[32];
-        mg_sock_addr_to_str(&nc->sa, addr, sizeof(addr), MG_SOCK_STRINGIFY_IP);
-#ifdef MG_LOG_DNS_FAILURES
-        LOG(LL_ERROR, ("Failed to resolve '%s', server %s", req->name, addr));
-#endif
-        req->callback(NULL, req->data, req->err);
-        nc->user_data = NULL;
-        MG_FREE(req);
+        return -1;
       }
-      break;
-  }
-}
-
-int mg_resolve_async(struct mg_mgr *mgr, const char *name, int query,
-                     mg_resolve_callback_t cb, void *data) {
-  struct mg_resolve_async_opts opts;
-  memset(&opts, 0, sizeof(opts));
-  return mg_resolve_async_opt(mgr, name, query, cb, data, opts);
-}
-
-int mg_resolve_async_opt(struct mg_mgr *mgr, const char *name, int query,
-                         mg_resolve_callback_t cb, void *data,
-                         struct mg_resolve_async_opts opts) {
-  struct mg_resolve_async_request *req;
-  struct mg_connection *dns_nc;
-  const char *nameserver = opts.nameserver;
-  char dns_server_buff[17], nameserver_url[26];
-
-  if (nameserver == NULL) {
-    nameserver = mgr->nameserver;
-  }
-
-  DBG(("%s %d %p", name, query, opts.dns_conn));
-
-  /* resolve with DNS */
-  req = (struct mg_resolve_async_request *) MG_CALLOC(1, sizeof(*req));
-  if (req == NULL) {
-    return -1;
-  }
-
-  strncpy(req->name, name, sizeof(req->name));
-  req->name[sizeof(req->name) - 1] = '\0';
-
-  req->query = query;
-  req->callback = cb;
-  req->data = data;
-  /* TODO(mkm): parse defaults out of resolve.conf */
-  req->max_retries = opts.max_retries ? opts.max_retries : 2;
-  req->timeout = opts.timeout ? opts.timeout : 5;
-
-  /* Lazily initialize dns server */
-  if (nameserver == NULL) {
-    if (mg_get_ip_address_of_nameserver(dns_server_buff,
-                                        sizeof(dns_server_buff)) != -1) {
-      nameserver = dns_server_buff;
+    } else if (is_form_url_encoded && src[i] == '+') {
+      dst[j] = ' ';
     } else {
-      nameserver = MG_DEFAULT_NAMESERVER;
-    }
-  }
-
-  snprintf(nameserver_url, sizeof(nameserver_url), "udp://%s:53", nameserver);
-
-  dns_nc = mg_connect(mgr, nameserver_url, MG_CB(mg_resolve_async_eh, NULL));
-  if (dns_nc == NULL) {
-    MG_FREE(req);
-    return -1;
-  }
-  dns_nc->user_data = req;
-  if (opts.dns_conn != NULL) {
-    *opts.dns_conn = dns_nc;
+      dst[j] = src[i];
+    }
   }
-
-  return 0;
+  if (j < dst_len) dst[j] = '\0';  // Null-terminate the destination
+  return i >= src_len && j < dst_len ? (int) j : -1;
 }
 
-void mg_set_nameserver(struct mg_mgr *mgr, const char *nameserver) {
-  MG_FREE((char *) mgr->nameserver);
-  mgr->nameserver = NULL;
-  if (nameserver != NULL) {
-    mgr->nameserver = strdup(nameserver);
+int mg_http_get_request_len(const unsigned char *buf, size_t buf_len) {
+  size_t i;
+  for (i = 0; i < buf_len; i++) {
+    if (!isprint(buf[i]) && buf[i] != '\r' && buf[i] != '\n' && buf[i] < 128)
+      return -1;
+    if ((i > 0 && buf[i] == '\n' && buf[i - 1] == '\n') ||
+        (i > 3 && buf[i] == '\n' && buf[i - 1] == '\r' && buf[i - 2] == '\n'))
+      return (int) i + 1;
   }
+  return 0;
 }
 
-#endif /* MG_ENABLE_ASYNC_RESOLVER */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_coap.c"
-#endif
-
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_coap.h" */
-
-#if MG_ENABLE_COAP
-
-void mg_coap_free_options(struct mg_coap_message *cm) {
-  while (cm->options != NULL) {
-    struct mg_coap_option *next = cm->options->next;
-    MG_FREE(cm->options);
-    cm->options = next;
-  }
+static const char *skip(const char *s, const char *e, const char *d,
+                        struct mg_str *v) {
+  v->ptr = s;
+  while (s < e && *s != '\n' && strchr(d, *s) == NULL) s++;
+  v->len = (size_t) (s - v->ptr);
+  while (s < e && strchr(d, *s) != NULL) s++;
+  return s;
 }
 
-struct mg_coap_option *mg_coap_add_option(struct mg_coap_message *cm,
-                                          uint32_t number, char *value,
-                                          size_t len) {
-  struct mg_coap_option *new_option =
-      (struct mg_coap_option *) MG_CALLOC(1, sizeof(*new_option));
-
-  new_option->number = number;
-  new_option->value.p = value;
-  new_option->value.len = len;
-
-  if (cm->options == NULL) {
-    cm->options = cm->optiomg_tail = new_option;
-  } else {
-    /*
-     * A very simple attention to help clients to compose options:
-     * CoAP wants to see options ASC ordered.
-     * Could be change by using sort in coap_compose
-     */
-    if (cm->optiomg_tail->number <= new_option->number) {
-      /* if option is already ordered just add it */
-      cm->optiomg_tail = cm->optiomg_tail->next = new_option;
-    } else {
-      /* looking for appropriate position */
-      struct mg_coap_option *current_opt = cm->options;
-      struct mg_coap_option *prev_opt = 0;
-
-      while (current_opt != NULL) {
-        if (current_opt->number > new_option->number) {
-          break;
-        }
-        prev_opt = current_opt;
-        current_opt = current_opt->next;
-      }
-
-      if (prev_opt != NULL) {
-        prev_opt->next = new_option;
-        new_option->next = current_opt;
-      } else {
-        /* insert new_option to the beginning */
-        new_option->next = cm->options;
-        cm->options = new_option;
-      }
-    }
+struct mg_str *mg_http_get_header(struct mg_http_message *h, const char *name) {
+  size_t i, n = strlen(name), max = sizeof(h->headers) / sizeof(h->headers[0]);
+  for (i = 0; i < max && h->headers[i].name.len > 0; i++) {
+    struct mg_str *k = &h->headers[i].name, *v = &h->headers[i].value;
+    if (n == k->len && mg_ncasecmp(k->ptr, name, n) == 0) return v;
   }
-
-  return new_option;
+  return NULL;
 }
 
-/*
- * Fills CoAP header in mg_coap_message.
- *
- * Helper function.
- */
-static char *coap_parse_header(char *ptr, struct mbuf *io,
-                               struct mg_coap_message *cm) {
-  if (io->len < sizeof(uint32_t)) {
-    cm->flags |= MG_COAP_NOT_ENOUGH_DATA;
-    return NULL;
-  }
+static void mg_http_parse_headers(const char *s, const char *end,
+                                  struct mg_http_header *h, int max_headers) {
+  int i;
+  for (i = 0; i < max_headers; i++) {
+    struct mg_str k, v, tmp;
+    const char *he = skip(s, end, "\n", &tmp);
+    s = skip(s, he, ": \r\n", &k);
+    s = skip(s, he, "\r\n", &v);
+    if (k.len == tmp.len) continue;
+    while (v.len > 0 && v.ptr[v.len - 1] == ' ') v.len--;  // Trim spaces
+    if (k.len == 0) break;
+    // LOG(LL_INFO, ("--HH [%.*s] [%.*s] [%.*s]", (int) tmp.len - 1, tmp.ptr,
+    //(int) k.len, k.ptr, (int) v.len, v.ptr));
+    h[i].name = k;
+    h[i].value = v;
+  }
+}
+
+int mg_http_parse(const char *s, size_t len, struct mg_http_message *hm) {
+  int is_response, req_len = mg_http_get_request_len((unsigned char *) s, len);
+  const char *end = s + req_len, *qs;
+  struct mg_str *cl;
 
-  /*
-   * Version (Ver):  2-bit unsigned integer.  Indicates the CoAP version
-   * number.  Implementations of this specification MUST set this field
-   * to 1 (01 binary).  Other values are reserved for future versions.
-   * Messages with unknown version numbers MUST be silently ignored.
-   */
-  if (((uint8_t) *ptr >> 6) != 1) {
-    cm->flags |= MG_COAP_IGNORE;
-    return NULL;
+  memset(hm, 0, sizeof(*hm));
+  if (req_len <= 0) return req_len;
+
+  hm->message.ptr = hm->head.ptr = s;
+  hm->body.ptr = end;
+  hm->head.len = (size_t) req_len;
+  hm->chunk.ptr = end;
+  hm->message.len = hm->body.len = (size_t) ~0;  // Set body length to infinite
+
+  // Parse request line
+  s = skip(s, end, " ", &hm->method);
+  s = skip(s, end, " ", &hm->uri);
+  s = skip(s, end, "\r\n", &hm->proto);
+
+  // Sanity check. Allow protocol/reason to be empty
+  if (hm->method.len == 0 || hm->uri.len == 0) return -1;
+
+  // If URI contains '?' character, setup query string
+  if ((qs = (const char *) memchr(hm->uri.ptr, '?', hm->uri.len)) != NULL) {
+    hm->query.ptr = qs + 1;
+    hm->query.len = (size_t) (&hm->uri.ptr[hm->uri.len] - (qs + 1));
+    hm->uri.len = (size_t) (qs - hm->uri.ptr);
+  }
+
+  mg_http_parse_headers(s, end, hm->headers,
+                        sizeof(hm->headers) / sizeof(hm->headers[0]));
+  if ((cl = mg_http_get_header(hm, "Content-Length")) != NULL) {
+    hm->body.len = (size_t) mg_to64(*cl);
+    hm->message.len = (size_t) req_len + hm->body.len;
+  }
+
+  // mg_http_parse() is used to parse both HTTP requests and HTTP
+  // responses. If HTTP response does not have Content-Length set, then
+  // body is read until socket is closed, i.e. body.len is infinite (~0).
+  //
+  // For HTTP requests though, according to
+  // http://tools.ietf.org/html/rfc7231#section-8.1.3,
+  // only POST and PUT methods have defined body semantics.
+  // Therefore, if Content-Length is not specified and methods are
+  // not one of PUT or POST, set body length to 0.
+  //
+  // So, if it is HTTP request, and Content-Length is not set,
+  // and method is not (PUT or POST) then reset body length to zero.
+  is_response = mg_ncasecmp(hm->method.ptr, "HTTP/", 5) == 0;
+  if (hm->body.len == (size_t) ~0 && !is_response &&
+      mg_vcasecmp(&hm->method, "PUT") != 0 &&
+      mg_vcasecmp(&hm->method, "POST") != 0) {
+    hm->body.len = 0;
+    hm->message.len = (size_t) req_len;
   }
 
-  /*
-   * Type (T):  2-bit unsigned integer.  Indicates if this message is of
-   * type Confirmable (0), Non-confirmable (1), Acknowledgement (2), or
-   * Reset (3).
-   */
-  cm->msg_type = ((uint8_t) *ptr & 0x30) >> 4;
-  cm->flags |= MG_COAP_MSG_TYPE_FIELD;
-
-  /*
-   * Token Length (TKL):  4-bit unsigned integer.  Indicates the length of
-   * the variable-length Token field (0-8 bytes).  Lengths 9-15 are
-   * reserved, MUST NOT be sent, and MUST be processed as a message
-   * format error.
-   */
-  cm->token.len = *ptr & 0x0F;
-  if (cm->token.len > 8) {
-    cm->flags |= MG_COAP_FORMAT_ERROR;
-    return NULL;
+  // The 204 (No content) responses also have 0 body length
+  if (hm->body.len == (size_t) ~0 && is_response &&
+      mg_vcasecmp(&hm->uri, "204") == 0) {
+    hm->body.len = 0;
+    hm->message.len = (size_t) req_len;
   }
 
-  ptr++;
-
-  /*
-   * Code:  8-bit unsigned integer, split into a 3-bit class (most
-   * significant bits) and a 5-bit detail (least significant bits)
-   */
-  cm->code_class = (uint8_t) *ptr >> 5;
-  cm->code_detail = *ptr & 0x1F;
-  cm->flags |= (MG_COAP_CODE_CLASS_FIELD | MG_COAP_CODE_DETAIL_FIELD);
+  return req_len;
+}
 
-  ptr++;
+static void mg_http_vprintf_chunk(struct mg_connection *c, const char *fmt,
+                                  va_list ap) {
+  char mem[256], *buf = mem;
+  int len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  mg_printf(c, "%X\r\n", len);
+  mg_send(c, buf, len > 0 ? (size_t) len : 0);
+  mg_send(c, "\r\n", 2);
+  if (buf != mem) free(buf);
+}
 
-  /* Message ID:  16-bit unsigned integer in network byte order. */
-  cm->msg_id = (uint8_t) *ptr << 8 | (uint8_t) * (ptr + 1);
-  cm->flags |= MG_COAP_MSG_ID_FIELD;
+void mg_http_printf_chunk(struct mg_connection *c, const char *fmt, ...) {
+  va_list ap;
+  va_start(ap, fmt);
+  mg_http_vprintf_chunk(c, fmt, ap);
+  va_end(ap);
+}
 
-  ptr += 2;
+void mg_http_write_chunk(struct mg_connection *c, const char *buf, size_t len) {
+  mg_printf(c, "%lX\r\n", (unsigned long) len);
+  mg_send(c, buf, len);
+  mg_send(c, "\r\n", 2);
+}
 
-  return ptr;
+// clang-format off
+static const char *mg_http_status_code_str(int status_code) {
+  switch (status_code) {
+    case 100: return "Continue";
+    case 101: return "Switching Protocols";
+    case 102: return "Processing";
+    case 200: return "OK";
+    case 201: return "Created";
+    case 202: return "Accepted";
+    case 203: return "Non-authoritative Information";
+    case 204: return "No Content";
+    case 205: return "Reset Content";
+    case 206: return "Partial Content";
+    case 207: return "Multi-Status";
+    case 208: return "Already Reported";
+    case 226: return "IM Used";
+    case 300: return "Multiple Choices";
+    case 301: return "Moved Permanently";
+    case 302: return "Found";
+    case 303: return "See Other";
+    case 304: return "Not Modified";
+    case 305: return "Use Proxy";
+    case 307: return "Temporary Redirect";
+    case 308: return "Permanent Redirect";
+    case 400: return "Bad Request";
+    case 401: return "Unauthorized";
+    case 402: return "Payment Required";
+    case 403: return "Forbidden";
+    case 404: return "Not Found";
+    case 405: return "Method Not Allowed";
+    case 406: return "Not Acceptable";
+    case 407: return "Proxy Authentication Required";
+    case 408: return "Request Timeout";
+    case 409: return "Conflict";
+    case 410: return "Gone";
+    case 411: return "Length Required";
+    case 412: return "Precondition Failed";
+    case 413: return "Payload Too Large";
+    case 414: return "Request-URI Too Long";
+    case 415: return "Unsupported Media Type";
+    case 416: return "Requested Range Not Satisfiable";
+    case 417: return "Expectation Failed";
+    case 418: return "I'm a teapot";
+    case 421: return "Misdirected Request";
+    case 422: return "Unprocessable Entity";
+    case 423: return "Locked";
+    case 424: return "Failed Dependency";
+    case 426: return "Upgrade Required";
+    case 428: return "Precondition Required";
+    case 429: return "Too Many Requests";
+    case 431: return "Request Header Fields Too Large";
+    case 444: return "Connection Closed Without Response";
+    case 451: return "Unavailable For Legal Reasons";
+    case 499: return "Client Closed Request";
+    case 500: return "Internal Server Error";
+    case 501: return "Not Implemented";
+    case 502: return "Bad Gateway";
+    case 503: return "Service Unavailable";
+    case 504: return "Gateway Timeout";
+    case 505: return "HTTP Version Not Supported";
+    case 506: return "Variant Also Negotiates";
+    case 507: return "Insufficient Storage";
+    case 508: return "Loop Detected";
+    case 510: return "Not Extended";
+    case 511: return "Network Authentication Required";
+    case 599: return "Network Connect Timeout Error";
+    default: return "OK";
+  }
+}
+// clang-format on
+
+void mg_http_reply(struct mg_connection *c, int code, const char *headers,
+                   const char *fmt, ...) {
+  char mem[256], *buf = mem;
+  va_list ap;
+  int len;
+  va_start(ap, fmt);
+  len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+  mg_printf(c, "HTTP/1.1 %d %s\r\n%sContent-Length: %d\r\n\r\n", code,
+            mg_http_status_code_str(code), headers == NULL ? "" : headers, len);
+  mg_send(c, buf, len > 0 ? (size_t) len : 0);
+  if (buf != mem) free(buf);
 }
 
-/*
- * Fills token information in mg_coap_message.
- *
- * Helper function.
- */
-static char *coap_get_token(char *ptr, struct mbuf *io,
-                            struct mg_coap_message *cm) {
-  if (cm->token.len != 0) {
-    if (ptr + cm->token.len > io->buf + io->len) {
-      cm->flags |= MG_COAP_NOT_ENOUGH_DATA;
-      return NULL;
-    } else {
-      cm->token.p = ptr;
-      ptr += cm->token.len;
-      cm->flags |= MG_COAP_TOKEN_FIELD;
-    }
-  }
+static void http_cb(struct mg_connection *, int, void *, void *);
+static void restore_http_cb(struct mg_connection *c) {
+  mg_fs_close((struct mg_fd *) c->pfn_data);
+  c->pfn_data = NULL;
+  c->pfn = http_cb;
+}
 
-  return ptr;
+char *mg_http_etag(char *buf, size_t len, size_t size, time_t mtime);
+char *mg_http_etag(char *buf, size_t len, size_t size, time_t mtime) {
+  snprintf(buf, len, "\"%lx." MG_INT64_FMT "\"", (unsigned long) mtime,
+           (int64_t) size);
+  return buf;
 }
 
-/*
- * Returns Option Delta or Length.
- *
- * Helper function.
- */
-static int coap_get_ext_opt(char *ptr, struct mbuf *io, uint16_t *opt_info) {
-  int ret = 0;
-
-  if (*opt_info == 13) {
-    /*
-     * 13:  An 8-bit unsigned integer follows the initial byte and
-     * indicates the Option Delta/Length minus 13.
-     */
-    if (ptr < io->buf + io->len) {
-      *opt_info = (uint8_t) *ptr + 13;
-      ret = sizeof(uint8_t);
-    } else {
-      ret = -1; /* LCOV_EXCL_LINE */
-    }
-  } else if (*opt_info == 14) {
-    /*
-     * 14:  A 16-bit unsigned integer in network byte order follows the
-     * initial byte and indicates the Option Delta/Length minus 269.
-     */
-    if (ptr + sizeof(uint8_t) < io->buf + io->len) {
-      *opt_info = ((uint8_t) *ptr << 8 | (uint8_t) * (ptr + 1)) + 269;
-      ret = sizeof(uint16_t);
-    } else {
-      ret = -1; /* LCOV_EXCL_LINE */
-    }
+static void static_cb(struct mg_connection *c, int ev, void *ev_data,
+                      void *fn_data) {
+  if (ev == MG_EV_WRITE || ev == MG_EV_POLL) {
+    struct mg_fd *fd = (struct mg_fd *) fn_data;
+    // Read to send IO buffer directly, avoid extra on-stack buffer
+    size_t n, max = 2 * MG_IO_SIZE;
+    if (c->send.size < max) mg_iobuf_resize(&c->send, max);
+    if (c->send.len >= c->send.size) return;  // Rate limit
+    n = fd->fs->read(fd->fd, c->send.buf + c->send.len,
+                     c->send.size - c->send.len);
+    if (n > 0) c->send.len += n;
+    if (c->send.len < c->send.size) restore_http_cb(c);
+  } else if (ev == MG_EV_CLOSE) {
+    restore_http_cb(c);
   }
-
-  return ret;
+  (void) ev_data;
 }
 
-/*
- * Fills options in mg_coap_message.
- *
- * Helper function.
- *
- * General options format:
- * +---------------+---------------+
- * | Option Delta  | Option Length |  1 byte
- * +---------------+---------------+
- * \    Option Delta (extended)    \  0-2 bytes
- * +-------------------------------+
- * / Option Length  (extended)     \  0-2 bytes
- * +-------------------------------+
- * \         Option Value          \  0 or more bytes
- * +-------------------------------+
- */
-static char *coap_get_options(char *ptr, struct mbuf *io,
-                              struct mg_coap_message *cm) {
-  uint16_t prev_opt = 0;
+static struct mg_str guess_content_type(struct mg_str path, const char *extra) {
+  // clang-format off
+  struct mimeentry { struct mg_str extension, value; };
+  #define MIME_ENTRY(a, b) {{a, sizeof(a) - 1 }, { b, sizeof(b) - 1 }}
+  // clang-format on
+  const struct mimeentry tab[] = {
+      MIME_ENTRY("html", "text/html; charset=utf-8"),
+      MIME_ENTRY("htm", "text/html; charset=utf-8"),
+      MIME_ENTRY("css", "text/css; charset=utf-8"),
+      MIME_ENTRY("js", "text/javascript; charset=utf-8"),
+      MIME_ENTRY("gif", "image/gif"),
+      MIME_ENTRY("png", "image/png"),
+      MIME_ENTRY("jpg", "image/jpeg"),
+      MIME_ENTRY("jpeg", "image/jpeg"),
+      MIME_ENTRY("woff", "font/woff"),
+      MIME_ENTRY("ttf", "font/ttf"),
+      MIME_ENTRY("svg", "image/svg+xml"),
+      MIME_ENTRY("txt", "text/plain; charset=utf-8"),
+      MIME_ENTRY("avi", "video/x-msvideo"),
+      MIME_ENTRY("csv", "text/csv"),
+      MIME_ENTRY("doc", "application/msword"),
+      MIME_ENTRY("exe", "application/octet-stream"),
+      MIME_ENTRY("gz", "application/gzip"),
+      MIME_ENTRY("ico", "image/x-icon"),
+      MIME_ENTRY("json", "application/json"),
+      MIME_ENTRY("mov", "video/quicktime"),
+      MIME_ENTRY("mp3", "audio/mpeg"),
+      MIME_ENTRY("mp4", "video/mp4"),
+      MIME_ENTRY("mpeg", "video/mpeg"),
+      MIME_ENTRY("pdf", "application/pdf"),
+      MIME_ENTRY("shtml", "text/html; charset=utf-8"),
+      MIME_ENTRY("tgz", "application/tar-gz"),
+      MIME_ENTRY("wav", "audio/wav"),
+      MIME_ENTRY("webp", "image/webp"),
+      MIME_ENTRY("zip", "application/zip"),
+      MIME_ENTRY("3gp", "video/3gpp"),
+      {{0, 0}, {0, 0}},
+  };
+  size_t i = 0;
+  struct mg_str k, v, s = mg_str(extra);
 
-  if (ptr == io->buf + io->len) {
-    /* end of packet, ok */
-    return NULL;
+  // Shrink path to its extension only
+  while (i < path.len && path.ptr[path.len - i - 1] != '.') i++;
+  path.ptr += path.len - i;
+  path.len = i;
+
+  // Process user-provided mime type overrides, if any
+  while (mg_commalist(&s, &k, &v)) {
+    if (mg_strcmp(path, k) == 0) return v;
   }
 
-  /* 0xFF is payload marker */
-  while (ptr < io->buf + io->len && (uint8_t) *ptr != 0xFF) {
-    uint16_t option_delta, option_lenght;
-    int optinfo_len;
+  // Process built-in mime types
+  for (i = 0; tab[i].extension.ptr != NULL; i++) {
+    if (mg_strcmp(path, tab[i].extension) == 0) return tab[i].value;
+  }
 
-    /* Option Delta:  4-bit unsigned integer */
-    option_delta = ((uint8_t) *ptr & 0xF0) >> 4;
-    /* Option Length:  4-bit unsigned integer */
-    option_lenght = *ptr & 0x0F;
+  return mg_str("text/plain; charset=utf-8");
+}
 
-    if (option_delta == 15 || option_lenght == 15) {
-      /*
-       * 15:  Reserved for future use.  If the field is set to this value,
-       * it MUST be processed as a message format error
-       */
-      cm->flags |= MG_COAP_FORMAT_ERROR;
+static int getrange(struct mg_str *s, int64_t *a, int64_t *b) {
+  size_t i, numparsed = 0;
+  LOG(LL_INFO, ("%.*s", (int) s->len, s->ptr));
+  for (i = 0; i + 6 < s->len; i++) {
+    if (memcmp(&s->ptr[i], "bytes=", 6) == 0) {
+      struct mg_str p = mg_str_n(s->ptr + i + 6, s->len - i - 6);
+      if (p.len > 0 && p.ptr[0] >= '0' && p.ptr[0] <= '9') numparsed++;
+      *a = mg_to64(p);
+      // LOG(LL_INFO, ("PPP [%.*s] %d", (int) p.len, p.ptr, numparsed));
+      while (p.len && p.ptr[0] >= '0' && p.ptr[0] <= '9') p.ptr++, p.len--;
+      if (p.len && p.ptr[0] == '-') p.ptr++, p.len--;
+      *b = mg_to64(p);
+      if (p.len > 0 && p.ptr[0] >= '0' && p.ptr[0] <= '9') numparsed++;
+      // LOG(LL_INFO, ("PPP [%.*s] %d", (int) p.len, p.ptr, numparsed));
       break;
     }
-
-    ptr++;
-
-    /* check for extended option delta */
-    optinfo_len = coap_get_ext_opt(ptr, io, &option_delta);
-    if (optinfo_len == -1) {
-      cm->flags |= MG_COAP_NOT_ENOUGH_DATA; /* LCOV_EXCL_LINE */
-      break;                                /* LCOV_EXCL_LINE */
+  }
+  return (int) numparsed;
+}
+
+void mg_http_serve_file(struct mg_connection *c, struct mg_http_message *hm,
+                        const char *path, struct mg_http_serve_opts *opts) {
+  char etag[64];
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct mg_fd *fd = mg_fs_open(fs, path, MG_FS_READ);
+  size_t size = 0;
+  time_t mtime = 0;
+  struct mg_str *inm = NULL;
+
+  if (fd == NULL || fs->stat(path, &size, &mtime) == 0) {
+    LOG(LL_DEBUG, ("404 [%s] %p", path, (void *) fd));
+    mg_http_reply(c, 404, "", "%s", "Not found\n");
+    mg_fs_close(fd);
+    // NOTE: mg_http_etag() call should go first!
+  } else if (mg_http_etag(etag, sizeof(etag), size, mtime) != NULL &&
+             (inm = mg_http_get_header(hm, "If-None-Match")) != NULL &&
+             mg_vcasecmp(inm, etag) == 0) {
+    mg_fs_close(fd);
+    mg_printf(c, "HTTP/1.1 304 Not Modified\r\nContent-Length: 0\r\n\r\n");
+  } else {
+    int n, status = 200;
+    char range[100] = "";
+    int64_t r1 = 0, r2 = 0, cl = (int64_t) size;
+    struct mg_str mime = guess_content_type(mg_str(path), opts->mime_types);
+
+    // Handle Range header
+    struct mg_str *rh = mg_http_get_header(hm, "Range");
+    if (rh != NULL && (n = getrange(rh, &r1, &r2)) > 0 && r1 >= 0 && r2 >= 0) {
+      // If range is specified like "400-", set second limit to content len
+      if (n == 1) r2 = cl - 1;
+      if (r1 > r2 || r2 >= cl) {
+        status = 416;
+        cl = 0;
+        snprintf(range, sizeof(range),
+                 "Content-Range: bytes */" MG_INT64_FMT "\r\n", (int64_t) size);
+      } else {
+        status = 206;
+        cl = r2 - r1 + 1;
+        snprintf(range, sizeof(range),
+                 "Content-Range: bytes " MG_INT64_FMT "-" MG_INT64_FMT
+                 "/" MG_INT64_FMT "\r\n",
+                 r1, r1 + cl - 1, (int64_t) size);
+        fs->seek(fd->fd, (size_t) r1);
+      }
     }
 
-    ptr += optinfo_len;
-
-    /* check or extended option lenght */
-    optinfo_len = coap_get_ext_opt(ptr, io, &option_lenght);
-    if (optinfo_len == -1) {
-      cm->flags |= MG_COAP_NOT_ENOUGH_DATA; /* LCOV_EXCL_LINE */
-      break;                                /* LCOV_EXCL_LINE */
+    mg_printf(c,
+              "HTTP/1.1 %d %s\r\nContent-Type: %.*s\r\n"
+              "Etag: %s\r\nContent-Length: " MG_INT64_FMT "\r\n%s%s\r\n",
+              status, mg_http_status_code_str(status), (int) mime.len, mime.ptr,
+              etag, cl, range, opts->extra_headers ? opts->extra_headers : "");
+    if (mg_vcasecmp(&hm->method, "HEAD") == 0) {
+      c->is_draining = 1;
+      mg_fs_close(fd);
+    } else {
+      c->pfn = static_cb;
+      c->pfn_data = fd;
     }
+  }
+}
 
-    ptr += optinfo_len;
-
-    /*
-     * Instead of specifying the Option Number directly, the instances MUST
-     * appear in order of their Option Numbers and a delta encoding is used
-     * between them.
-     */
-    option_delta += prev_opt;
+struct printdirentrydata {
+  struct mg_connection *c;
+  struct mg_http_message *hm;
+  struct mg_http_serve_opts *opts;
+  const char *dir;
+};
 
-    mg_coap_add_option(cm, option_delta, ptr, option_lenght);
+static void printdirentry(const char *name, void *userdata) {
+  struct printdirentrydata *d = (struct printdirentrydata *) userdata;
+  struct mg_fs *fs = d->opts->fs == NULL ? &mg_fs_posix : d->opts->fs;
+  size_t size = 0;
+  time_t t = 0;
+  char path[MG_PATH_MAX], sz[64], mod[64];
+  int flags, n = 0;
+
+  // LOG(LL_DEBUG, ("[%s] [%s]", d->dir, name));
+  if (snprintf(path, sizeof(path), "%s%c%s", d->dir, '/', name) < 0) {
+    LOG(LL_ERROR, ("%s truncated", name));
+  } else if ((flags = fs->stat(path, &size, &t)) == 0) {
+    LOG(LL_ERROR, ("%lu stat(%s): %d", d->c->id, path, errno));
+  } else {
+    const char *slash = flags & MG_FS_DIR ? "/" : "";
+    struct tm tm;
+    if (flags & MG_FS_DIR) {
+      snprintf(sz, sizeof(sz), "%s", "[DIR]");
+    } else if (size < 1024) {
+      snprintf(sz, sizeof(sz), "%d", (int) size);
+    } else if (size < 0x100000) {
+      snprintf(sz, sizeof(sz), "%.1fk", (double) size / 1024.0);
+    } else if (size < 0x40000000) {
+      snprintf(sz, sizeof(sz), "%.1fM", (double) size / 1048576);
+    } else {
+      snprintf(sz, sizeof(sz), "%.1fG", (double) size / 1073741824);
+    }
+    strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime_r(&t, &tm));
+    n = (int) mg_url_encode(name, strlen(name), path, sizeof(path));
+    mg_printf(d->c,
+              "  <tr><td><a href=\"%.*s%s\">%s%s</a></td>"
+              "<td name=%lu>%s</td><td name=" MG_INT64_FMT ">%s</td></tr>\n",
+              n, path, slash, name, slash, (unsigned long) t, mod,
+              flags & MG_FS_DIR ? (int64_t) -1 : (int64_t) size, sz);
+  }
+}
 
-    prev_opt = option_delta;
+static void listdir(struct mg_connection *c, struct mg_http_message *hm,
+                    struct mg_http_serve_opts *opts, char *dir) {
+  static const char *sort_js_code =
+      "<script>function srt(tb, sc, so, d) {"
+      "var tr = Array.prototype.slice.call(tb.rows, 0),"
+      "tr = tr.sort(function (a, b) { var c1 = a.cells[sc], c2 = b.cells[sc],"
+      "n1 = c1.getAttribute('name'), n2 = c2.getAttribute('name'), "
+      "t1 = a.cells[2].getAttribute('name'), "
+      "t2 = b.cells[2].getAttribute('name'); "
+      "return so * (t1 < 0 && t2 >= 0 ? -1 : t2 < 0 && t1 >= 0 ? 1 : "
+      "n1 ? parseInt(n2) - parseInt(n1) : "
+      "c1.textContent.trim().localeCompare(c2.textContent.trim())); });";
+  static const char *sort_js_code2 =
+      "for (var i = 0; i < tr.length; i++) tb.appendChild(tr[i]); "
+      "if (!d) window.location.hash = ('sc=' + sc + '&so=' + so); "
+      "};"
+      "window.onload = function() {"
+      "var tb = document.getElementById('tb');"
+      "var m = /sc=([012]).so=(1|-1)/.exec(window.location.hash) || [0, 2, 1];"
+      "var sc = m[1], so = m[2]; document.onclick = function(ev) { "
+      "var c = ev.target.rel; if (c) {if (c == sc) so *= -1; srt(tb, c, so); "
+      "sc = c; ev.preventDefault();}};"
+      "srt(tb, sc, so, true);"
+      "}"
+      "</script>";
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct printdirentrydata d = {c, hm, opts, dir};
+  char tmp[10], buf[MG_PATH_MAX];
+  size_t off, n;
+  int len = mg_url_decode(hm->uri.ptr, hm->uri.len, buf, sizeof(buf), 0);
+  struct mg_str uri = len > 0 ? mg_str_n(buf, (size_t) len) : hm->uri;
 
-    if (ptr + option_lenght > io->buf + io->len) {
-      cm->flags |= MG_COAP_NOT_ENOUGH_DATA; /* LCOV_EXCL_LINE */
-      break;                                /* LCOV_EXCL_LINE */
+  mg_printf(c,
+            "HTTP/1.1 200 OK\r\n"
+            "Content-Type: text/html; charset=utf-8\r\n"
+            "%s"
+            "Content-Length:         \r\n\r\n",
+            opts->extra_headers == NULL ? "" : opts->extra_headers);
+  off = c->send.len;  // Start of body
+  mg_printf(c,
+            "<!DOCTYPE html><html><head><title>Index of %.*s</title>%s%s"
+            "<style>th,td {text-align: left; padding-right: 1em; "
+            "font-family: monospace; }</style></head>"
+            "<body><h1>Index of %.*s</h1><table cellpadding=\"0\"><thead>"
+            "<tr><th><a href=\"#\" rel=\"0\">Name</a></th><th>"
+            "<a href=\"#\" rel=\"1\">Modified</a></th>"
+            "<th><a href=\"#\" rel=\"2\">Size</a></th></tr>"
+            "<tr><td colspan=\"3\"><hr></td></tr>"
+            "</thead>"
+            "<tbody id=\"tb\">\n",
+            (int) uri.len, uri.ptr, sort_js_code, sort_js_code2, (int) uri.len,
+            uri.ptr);
+
+  fs->list(dir, printdirentry, &d);
+  mg_printf(c,
+            "</tbody><tfoot><tr><td colspan=\"3\"><hr></td></tr></tfoot>"
+            "</table><address>Mongoose v.%s</address></body></html>\n",
+            MG_VERSION);
+  n = (size_t) snprintf(tmp, sizeof(tmp), "%lu",
+                        (unsigned long) (c->send.len - off));
+  if (n > sizeof(tmp)) n = 0;
+  memcpy(c->send.buf + off - 10, tmp, n);  // Set content length
+}
+
+static void remove_double_dots(char *s) {
+  char *p = s;
+  while (*s != '\0') {
+    *p++ = *s++;
+    if (s[-1] == '/' || s[-1] == '\\') {
+      while (s[0] != '\0') {
+        if (s[0] == '/' || s[0] == '\\') {
+          s++;
+        } else if (s[0] == '.' && s[1] == '.' &&
+                   (s[2] == '/' || s[2] == '\\')) {
+          s += 2;
+        } else {
+          break;
+        }
+      }
     }
-
-    ptr += option_lenght;
   }
+  *p = '\0';
+}
 
-  if ((cm->flags & MG_COAP_ERROR) != 0) {
-    mg_coap_free_options(cm);
-    return NULL;
+// Resolve requested file into `path` and return its fs->stat() result
+static int uri_to_path2(struct mg_connection *c, struct mg_http_message *hm,
+                        struct mg_fs *fs, struct mg_str url, struct mg_str dir,
+                        char *path, size_t path_size) {
+  int flags = 0, tmp;
+  // Append URI to the root_dir, and sanitize it
+  size_t n = (size_t) snprintf(path, path_size, "%.*s", (int) dir.len, dir.ptr);
+  if (n > path_size) n = path_size;
+  path[path_size - 1] = '\0';
+  if ((fs->stat(path, NULL, NULL) & MG_FS_DIR) == 0) {
+    mg_http_reply(c, 400, "", "Invalid web root [%.*s]\n", (int) dir.len,
+                  dir.ptr);
+  } else {
+    if (n + 2 < path_size) path[n++] = '/', path[n] = '\0';
+    mg_url_decode(hm->uri.ptr + url.len, hm->uri.len - url.len, path + n,
+                  path_size - n, 0);
+    path[path_size - 1] = '\0';  // Double-check
+    remove_double_dots(path);
+    n = strlen(path);
+    LOG(LL_VERBOSE_DEBUG,
+        ("%lu %.*s -> %s", c->id, (int) hm->uri.len, hm->uri.ptr, path));
+    while (n > 0 && path[n - 1] == '/') path[--n] = 0;  // Trim trailing slashes
+    flags = fs->stat(path, NULL, NULL);                 // Does it exist?
+    if (flags == 0) {
+      mg_http_reply(c, 404, "", "Not found\n");  // Does not exist, doh
+    } else if ((flags & MG_FS_DIR) && hm->uri.len > 0 &&
+               hm->uri.ptr[hm->uri.len - 1] != '/') {
+      mg_printf(c,
+                "HTTP/1.1 301 Moved\r\n"
+                "Location: %.*s/\r\n"
+                "Content-Length: 0\r\n"
+                "\r\n",
+                (int) hm->uri.len, hm->uri.ptr);
+      flags = 0;
+    } else if (flags & MG_FS_DIR) {
+      if (((snprintf(path + n, path_size - n, "/" MG_HTTP_INDEX) > 0 &&
+            (tmp = fs->stat(path, NULL, NULL)) != 0) ||
+           (snprintf(path + n, path_size - n, "/index.shtml") > 0 &&
+            (tmp = fs->stat(path, NULL, NULL)) != 0))) {
+        flags = tmp;
+      } else {
+        path[n] = '\0';  // Remove appended index file name
+      }
+    }
   }
+  return flags;
+}
 
-  cm->flags |= MG_COAP_OPTIOMG_FIELD;
-
-  if (ptr == io->buf + io->len) {
-    /* end of packet, ok */
-    return NULL;
+static int uri_to_path(struct mg_connection *c, struct mg_http_message *hm,
+                       struct mg_http_serve_opts *opts, char *path,
+                       size_t path_size) {
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct mg_str k, v, s = mg_str(opts->root_dir), u = {0, 0}, p = {0, 0};
+  while (mg_commalist(&s, &k, &v)) {
+    if (v.len == 0) v = k, k = mg_str("/");
+    if (hm->uri.len < k.len) continue;
+    if (mg_strcmp(k, mg_str_n(hm->uri.ptr, k.len)) != 0) continue;
+    u = k, p = v;
   }
-
-  ptr++;
-
-  return ptr;
+  return uri_to_path2(c, hm, fs, u, p, path, path_size);
 }
 
-uint32_t mg_coap_parse(struct mbuf *io, struct mg_coap_message *cm) {
-  char *ptr;
-
-  memset(cm, 0, sizeof(*cm));
-
-  if ((ptr = coap_parse_header(io->buf, io, cm)) == NULL) {
-    return cm->flags;
+void mg_http_serve_dir(struct mg_connection *c, struct mg_http_message *hm,
+                       struct mg_http_serve_opts *opts) {
+  char path[MG_PATH_MAX] = "";
+  const char *sp = opts->ssi_pattern;
+  int flags = uri_to_path(c, hm, opts, path, sizeof(path));
+  if (flags == 0) return;
+  LOG(LL_VERBOSE_DEBUG,
+      ("%.*s %s %d", (int) hm->uri.len, hm->uri.ptr, path, flags));
+  if (flags & MG_FS_DIR) {
+    listdir(c, hm, opts, path);
+  } else if (sp != NULL && mg_globmatch(sp, strlen(sp), path, strlen(path))) {
+    mg_http_serve_ssi(c, opts->root_dir, path);
+  } else {
+    mg_http_serve_file(c, hm, path, opts);
   }
+}
 
-  if ((ptr = coap_get_token(ptr, io, cm)) == NULL) {
-    return cm->flags;
-  }
+static bool mg_is_url_safe(int c) {
+  return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') ||
+         (c >= 'A' && c <= 'Z') || c == '.' || c == '_' || c == '-' || c == '~';
+}
 
-  if ((ptr = coap_get_options(ptr, io, cm)) == NULL) {
-    return cm->flags;
+size_t mg_url_encode(const char *s, size_t sl, char *buf, size_t len) {
+  size_t i, n = 0;
+  for (i = 0; i < sl; i++) {
+    int c = *(unsigned char *) &s[i];
+    if (n + 4 >= len) return 0;
+    if (mg_is_url_safe(c)) {
+      buf[n++] = s[i];
+    } else {
+      buf[n++] = '%';
+      mg_hex(&s[i], 1, &buf[n]);
+      n += 2;
+    }
   }
+  return n;
+}
 
-  /* the rest is payload */
-  cm->payload.len = io->len - (ptr - io->buf);
-  if (cm->payload.len != 0) {
-    cm->payload.p = ptr;
-    cm->flags |= MG_COAP_PAYLOAD_FIELD;
+void mg_http_creds(struct mg_http_message *hm, char *user, size_t userlen,
+                   char *pass, size_t passlen) {
+  struct mg_str *v = mg_http_get_header(hm, "Authorization");
+  user[0] = pass[0] = '\0';
+  if (v != NULL && v->len > 6 && memcmp(v->ptr, "Basic ", 6) == 0) {
+    char buf[256];
+    int n = mg_base64_decode(v->ptr + 6, (int) v->len - 6, buf);
+    const char *p = (const char *) memchr(buf, ':', n > 0 ? (size_t) n : 0);
+    if (p != NULL) {
+      snprintf(user, userlen, "%.*s", (int) (p - buf), buf);
+      snprintf(pass, passlen, "%.*s", n - (int) (p - buf) - 1, p + 1);
+    }
+  } else if (v != NULL && v->len > 7 && memcmp(v->ptr, "Bearer ", 7) == 0) {
+    snprintf(pass, passlen, "%.*s", (int) v->len - 7, v->ptr + 7);
+  } else if ((v = mg_http_get_header(hm, "Cookie")) != NULL) {
+    struct mg_str t = mg_http_get_header_var(*v, mg_str_n("access_token", 12));
+    if (t.len > 0) snprintf(pass, passlen, "%.*s", (int) t.len, t.ptr);
+  } else {
+    mg_http_get_var(&hm->query, "access_token", pass, passlen);
   }
-
-  return cm->flags;
 }
 
-/*
- * Calculates extended size of given Opt Number/Length in coap message.
- *
- * Helper function.
- */
-static size_t coap_get_ext_opt_size(uint32_t value) {
-  int ret = 0;
+static struct mg_str stripquotes(struct mg_str s) {
+  return s.len > 1 && s.ptr[0] == '"' && s.ptr[s.len - 1] == '"'
+             ? mg_str_n(s.ptr + 1, s.len - 2)
+             : s;
+}
 
-  if (value >= 13 && value <= 0xFF + 13) {
-    ret = sizeof(uint8_t);
-  } else if (value > 0xFF + 13 && value <= 0xFFFF + 269) {
-    ret = sizeof(uint16_t);
+struct mg_str mg_http_get_header_var(struct mg_str s, struct mg_str v) {
+  size_t i;
+  for (i = 0; v.len > 0 && i + v.len + 2 < s.len; i++) {
+    if (s.ptr[i + v.len] == '=' && memcmp(&s.ptr[i], v.ptr, v.len) == 0) {
+      const char *p = &s.ptr[i + v.len + 1], *b = p, *x = &s.ptr[s.len];
+      int q = p < x && *p == '"' ? 1 : 0;
+      while (p < x &&
+             (q ? p == b || *p != '"' : *p != ';' && *p != ' ' && *p != ','))
+        p++;
+      // LOG(LL_INFO, ("[%.*s] [%.*s] [%.*s]", (int) s.len, s.ptr, (int) v.len,
+      // v.ptr, (int) (p - b), b));
+      return stripquotes(mg_str_n(b, (size_t) (p - b + q)));
+    }
   }
+  return mg_str_n(NULL, 0);
+}
 
-  return ret;
+bool mg_http_match_uri(const struct mg_http_message *hm, const char *glob) {
+  return mg_globmatch(glob, strlen(glob), hm->uri.ptr, hm->uri.len);
 }
 
-/*
- * Splits given Opt Number/Length into base and ext values.
- *
- * Helper function.
- */
-static int coap_split_opt(uint32_t value, uint8_t *base, uint16_t *ext) {
-  int ret = 0;
+static size_t get_chunk_length(const char *buf, size_t len, size_t *ll) {
+  size_t i = 0, n;
+  while (i < len && buf[i] != '\r' && i != '\n') i++;
+  n = mg_unhexn((char *) buf, i);
+  while (i < len && (buf[i] == '\r' || i == '\n')) i++;
+  // LOG(LL_INFO, ("len %zu i %zu n %zu ", len, i, n));
+  if (ll != NULL) *ll = i + 1;
+  if (i < len && i + n + 2 < len) return i + n + 3;
+  return 0;
+}
 
-  if (value < 13) {
-    *base = value;
-  } else if (value >= 13 && value <= 0xFF + 13) {
-    *base = 13;
-    *ext = value - 13;
-    ret = sizeof(uint8_t);
-  } else if (value > 0xFF + 13 && value <= 0xFFFF + 269) {
-    *base = 14;
-    *ext = value - 269;
-    ret = sizeof(uint16_t);
+// Walk through all chunks in the chunked body. For each chunk, fire
+// an MG_EV_HTTP_CHUNK event.
+static void walkchunks(struct mg_connection *c, struct mg_http_message *hm,
+                       size_t reqlen) {
+  size_t off = 0, bl, ll;
+  while (off + reqlen < c->recv.len) {
+    char *buf = (char *) &c->recv.buf[reqlen];
+    size_t memo = c->recv.len;
+    size_t cl = get_chunk_length(&buf[off], memo - reqlen - off, &ll);
+    // LOG(LL_INFO, ("len %zu off %zu cl %zu ll %zu", len, off, cl, ll));
+    if (cl == 0) break;
+    hm->chunk = mg_str_n(&buf[off + ll], cl < ll + 2 ? 0 : cl - ll - 2);
+    mg_call(c, MG_EV_HTTP_CHUNK, hm);
+    // Increase offset only if user has not deleted this chunk
+    if (memo == c->recv.len) off += cl;
+    if (cl <= 5) {
+      // Zero chunk - last one. Prepare body - cut off chunk lengths
+      off = bl = 0;
+      while (off + reqlen < c->recv.len) {
+        char *buf2 = (char *) &c->recv.buf[reqlen];
+        size_t memo2 = c->recv.len;
+        size_t cl2 = get_chunk_length(&buf2[off], memo2 - reqlen - off, &ll);
+        size_t n = cl2 < ll + 2 ? 0 : cl2 - ll - 2;
+        memmove(buf2 + bl, buf2 + off + ll, n);
+        bl += n;
+        off += cl2;
+        if (cl2 <= 5) break;
+      }
+      // LOG(LL_INFO, ("BL->%d del %d off %d", (int) bl, (int) del, (int) off));
+      c->recv.len -= off - bl;
+      // Set message length to indicate we've received
+      // everything, to fire MG_EV_HTTP_MSG
+      hm->message.len = bl + reqlen;
+      hm->body.len = bl;
+      break;
+    }
   }
-
-  return ret;
 }
 
-/*
- * Puts uint16_t (in network order) into given char stream.
- *
- * Helper function.
- */
-static char *coap_add_uint16(char *ptr, uint16_t val) {
-  *ptr = val >> 8;
-  ptr++;
-  *ptr = val & 0x00FF;
-  ptr++;
-  return ptr;
+static bool mg_is_chunked(struct mg_http_message *hm) {
+  struct mg_str needle = mg_str_n("chunked", 7);
+  struct mg_str *te = mg_http_get_header(hm, "Transfer-Encoding");
+  return te != NULL && mg_strstr(*te, needle) != NULL;
 }
 
-/*
- * Puts extended value of Opt Number/Length into given char stream.
- *
- * Helper function.
- */
-static char *coap_add_opt_info(char *ptr, uint16_t val, size_t len) {
-  if (len == sizeof(uint8_t)) {
-    *ptr = (char) val;
-    ptr++;
-  } else if (len == sizeof(uint16_t)) {
-    ptr = coap_add_uint16(ptr, val);
+void mg_http_delete_chunk(struct mg_connection *c, struct mg_http_message *hm) {
+  struct mg_str ch = hm->chunk;
+  if (mg_is_chunked(hm)) {
+    ch.len += 4;  // \r\n before and after the chunk
+    ch.ptr -= 2;
+    while (ch.ptr > hm->body.ptr && *ch.ptr != '\n') ch.ptr--, ch.len++;
   }
-
-  return ptr;
+  {
+    const char *end = &ch.ptr[ch.len];
+    size_t n = (size_t) (end - (char *) c->recv.buf);
+    if (c->recv.len > n) {
+      memmove((char *) ch.ptr, end, (size_t) (c->recv.len - n));
+    }
+    // LOG(LL_INFO, ("DELETING CHUNK: %zu %zu %zu\n%.*s", c->recv.len, n,
+    // ch.len, (int) ch.len, ch.ptr));
+  }
+  c->recv.len -= ch.len;
 }
 
-/*
- * Verifies given mg_coap_message and calculates message size for it.
- *
- * Helper function.
- */
-static uint32_t coap_calculate_packet_size(struct mg_coap_message *cm,
-                                           size_t *len) {
-  struct mg_coap_option *opt;
-  uint32_t prev_opt_number;
-
-  *len = 4; /* header */
-  if (cm->msg_type > MG_COAP_MSG_MAX) {
-    return MG_COAP_ERROR | MG_COAP_MSG_TYPE_FIELD;
-  }
-  if (cm->token.len > 8) {
-    return MG_COAP_ERROR | MG_COAP_TOKEN_FIELD;
-  }
-  if (cm->code_class > 7) {
-    return MG_COAP_ERROR | MG_COAP_CODE_CLASS_FIELD;
-  }
-  if (cm->code_detail > 31) {
-    return MG_COAP_ERROR | MG_COAP_CODE_DETAIL_FIELD;
-  }
-
-  *len += cm->token.len;
-  if (cm->payload.len != 0) {
-    *len += cm->payload.len + 1; /* ... + 1; add payload marker */
-  }
-
-  opt = cm->options;
-  prev_opt_number = 0;
-  while (opt != NULL) {
-    *len += 1; /* basic delta/length */
-    *len += coap_get_ext_opt_size(opt->number - prev_opt_number);
-    *len += coap_get_ext_opt_size((uint32_t) opt->value.len);
-    /*
-     * Current implementation performs check if
-     * option_number > previous option_number and produces an error
-     * TODO(alashkin): write design doc with limitations
-     * May be resorting is more suitable solution.
-     */
-    if ((opt->next != NULL && opt->number > opt->next->number) ||
-        opt->value.len > 0xFFFF + 269 ||
-        opt->number - prev_opt_number > 0xFFFF + 269) {
-      return MG_COAP_ERROR | MG_COAP_OPTIOMG_FIELD;
+int mg_http_upload(struct mg_connection *c, struct mg_http_message *hm,
+                   struct mg_fs *fs, const char *dir) {
+  char offset[40] = "", name[200] = "", path[256];
+  mg_http_get_var(&hm->query, "offset", offset, sizeof(offset));
+  mg_http_get_var(&hm->query, "name", name, sizeof(name));
+  if (name[0] == '\0') {
+    mg_http_reply(c, 400, "", "%s", "name required");
+    return -1;
+  } else {
+    struct mg_fd *fd;
+    long oft = strtol(offset, NULL, 0);
+    snprintf(path, sizeof(path), "%s%c%s", dir, MG_DIRSEP, name);
+    remove_double_dots(path);
+    LOG(LL_DEBUG, ("%d bytes @ %ld [%s]", (int) hm->body.len, oft, path));
+    if (oft == 0) fs->remove(path);
+    if ((fd = mg_fs_open(fs, path, MG_FS_WRITE)) == NULL) {
+      mg_http_reply(c, 400, "", "open(%s): %d", path, errno);
+      return -2;
+    } else {
+      int written = (int) fs->write(fd->fd, hm->body.ptr, hm->body.len);
+      mg_fs_close(fd);
+      mg_http_reply(c, 200, "", "%d", written);
+      return (int) hm->body.len;
+    }
+  }
+}
+
+static void http_cb(struct mg_connection *c, int ev, void *evd, void *fnd) {
+  if (ev == MG_EV_READ || ev == MG_EV_CLOSE) {
+    struct mg_http_message hm;
+    while (c->recv.buf != NULL && c->recv.len > 0) {
+      int n = mg_http_parse((char *) c->recv.buf, c->recv.len, &hm);
+      bool is_chunked = n > 0 && mg_is_chunked(&hm);
+      if (ev == MG_EV_CLOSE) {
+        hm.message.len = c->recv.len;
+        hm.body.len = hm.message.len - (size_t) (hm.body.ptr - hm.message.ptr);
+      } else if (is_chunked && n > 0) {
+        walkchunks(c, &hm, (size_t) n);
+      }
+      // LOG(LL_INFO,
+      //("---->%d %d\n%.*s", n, is_chunked, (int) c->recv.len, c->recv.buf));
+      if (n < 0 && ev == MG_EV_READ) {
+        mg_error(c, "HTTP parse:\n%.*s", (int) c->recv.len, c->recv.buf);
+        break;
+      } else if (n > 0 && (size_t) c->recv.len >= hm.message.len) {
+        mg_call(c, MG_EV_HTTP_MSG, &hm);
+        mg_iobuf_del(&c->recv, 0, hm.message.len);
+      } else {
+        if (n > 0 && !is_chunked) {
+          hm.chunk =
+              mg_str_n((char *) &c->recv.buf[n], c->recv.len - (size_t) n);
+          mg_call(c, MG_EV_HTTP_CHUNK, &hm);
+        }
+        break;
+      }
     }
-    *len += opt->value.len;
-    prev_opt_number = opt->number;
-    opt = opt->next;
   }
-
-  return 0;
+  (void) fnd;
+  (void) evd;
 }
 
-uint32_t mg_coap_compose(struct mg_coap_message *cm, struct mbuf *io) {
-  struct mg_coap_option *opt;
-  uint32_t res, prev_opt_number;
-  size_t prev_io_len, packet_size;
-  char *ptr;
-
-  res = coap_calculate_packet_size(cm, &packet_size);
-  if (res != 0) {
-    return res;
-  }
+struct mg_connection *mg_http_connect(struct mg_mgr *mgr, const char *url,
+                                      mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_connect(mgr, url, fn, fn_data);
+  if (c != NULL) c->pfn = http_cb;
+  return c;
+}
 
-  /* saving previous lenght to handle non-empty mbuf */
-  prev_io_len = io->len;
-  if (mbuf_append(io, NULL, packet_size) == 0) return MG_COAP_ERROR;
-  ptr = io->buf + prev_io_len;
+struct mg_connection *mg_http_listen(struct mg_mgr *mgr, const char *url,
+                                     mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_listen(mgr, url, fn, fn_data);
+  if (c != NULL) c->pfn = http_cb;
+  return c;
+}
 
-  /*
-   * since cm is verified, it is possible to use bits shift operator
-   * without additional zeroing of unused bits
-   */
+#ifdef MG_ENABLE_LINES
+#line 1 "src/iobuf.c"
+#endif
 
-  /* ver: 2 bits, msg_type: 2 bits, toklen: 4 bits */
-  *ptr = (1 << 6) | (cm->msg_type << 4) | (uint8_t)(cm->token.len);
-  ptr++;
 
-  /* code class: 3 bits, code detail: 5 bits */
-  *ptr = (cm->code_class << 5) | (cm->code_detail);
-  ptr++;
 
-  ptr = coap_add_uint16(ptr, cm->msg_id);
+#include <string.h>
 
-  if (cm->token.len != 0) {
-    memcpy(ptr, cm->token.p, cm->token.len);
-    ptr += cm->token.len;
+// Not using memset for zeroing memory, cause it can be dropped by compiler
+// See https://github.com/cesanta/mongoose/pull/1265
+static void zeromem(volatile unsigned char *buf, size_t len) {
+  if (buf != NULL) {
+    while (len--) *buf++ = 0;
   }
+}
 
-  opt = cm->options;
-  prev_opt_number = 0;
-  while (opt != NULL) {
-    uint8_t delta_base = 0, length_base = 0;
-    uint16_t delta_ext = 0, length_ext = 0;
-
-    size_t opt_delta_len =
-        coap_split_opt(opt->number - prev_opt_number, &delta_base, &delta_ext);
-    size_t opt_lenght_len =
-        coap_split_opt((uint32_t) opt->value.len, &length_base, &length_ext);
-
-    *ptr = (delta_base << 4) | length_base;
-    ptr++;
-
-    ptr = coap_add_opt_info(ptr, delta_ext, opt_delta_len);
-    ptr = coap_add_opt_info(ptr, length_ext, opt_lenght_len);
-
-    if (opt->value.len != 0) {
-      memcpy(ptr, opt->value.p, opt->value.len);
-      ptr += opt->value.len;
+int mg_iobuf_resize(struct mg_iobuf *io, size_t new_size) {
+  int ok = 1;
+  if (new_size == 0) {
+    zeromem(io->buf, io->size);
+    free(io->buf);
+    io->buf = NULL;
+    io->len = io->size = 0;
+  } else if (new_size != io->size) {
+    // NOTE(lsm): do not use realloc here. Use calloc/free only, to ease the
+    // porting to some obscure platforms like FreeRTOS
+    void *p = calloc(1, new_size);
+    if (p != NULL) {
+      size_t len = new_size < io->len ? new_size : io->len;
+      if (len > 0) memcpy(p, io->buf, len);
+      zeromem(io->buf, io->size);
+      free(io->buf);
+      io->buf = (unsigned char *) p;
+      io->size = new_size;
+    } else {
+      ok = 0;
+      LOG(LL_ERROR,
+          ("%lu->%lu", (unsigned long) io->size, (unsigned long) new_size));
     }
-
-    prev_opt_number = opt->number;
-    opt = opt->next;
   }
+  return ok;
+}
+
+int mg_iobuf_init(struct mg_iobuf *io, size_t size) {
+  return mg_iobuf_resize(io, size);
+}
 
-  if (cm->payload.len != 0) {
-    *ptr = (char) -1;
-    ptr++;
-    memcpy(ptr, cm->payload.p, cm->payload.len);
+size_t mg_iobuf_add(struct mg_iobuf *io, size_t ofs, const void *buf,
+                    size_t len, size_t chunk_size) {
+  size_t new_size = io->len + len;
+  if (new_size > io->size) {
+    new_size += chunk_size;             // Make sure that io->size
+    new_size -= new_size % chunk_size;  // is aligned by chunk_size boundary
+    mg_iobuf_resize(io, new_size);      // Attempt to realloc
+    if (new_size != io->size) len = 0;  // Realloc failure, append nothing
   }
+  if (ofs < io->len) memmove(io->buf + ofs + len, io->buf + ofs, io->len - ofs);
+  if (buf != NULL) memmove(io->buf + ofs, buf, len);
+  if (ofs > io->len) io->len += ofs - io->len;
+  io->len += len;
+  return len;
+}
 
-  return 0;
+size_t mg_iobuf_del(struct mg_iobuf *io, size_t ofs, size_t len) {
+  if (ofs > io->len) ofs = io->len;
+  if (ofs + len > io->len) len = io->len - ofs;
+  memmove(io->buf + ofs, io->buf + ofs + len, io->len - ofs - len);
+  zeromem(io->buf + io->len - len, len);
+  io->len -= len;
+  return len;
+}
+
+void mg_iobuf_free(struct mg_iobuf *io) {
+  mg_iobuf_resize(io, 0);
 }
 
-uint32_t mg_coap_send_message(struct mg_connection *nc,
-                              struct mg_coap_message *cm) {
-  struct mbuf packet_out;
-  uint32_t compose_res;
+#ifdef MG_ENABLE_LINES
+#line 1 "src/log.c"
+#endif
 
-  mbuf_init(&packet_out, 0);
-  compose_res = mg_coap_compose(cm, &packet_out);
-  if (compose_res != 0) {
-    return compose_res; /* LCOV_EXCL_LINE */
-  }
 
-  mg_send(nc, packet_out.buf, (int) packet_out.len);
-  mbuf_free(&packet_out);
 
-  return 0;
+#if MG_ENABLE_LOG
+static void mg_log_stdout(const void *buf, size_t len, void *userdata) {
+  (void) userdata;
+#if MG_ENABLE_FILE
+  fwrite(buf, 1, len, stdout);
+#endif
 }
 
-uint32_t mg_coap_send_ack(struct mg_connection *nc, uint16_t msg_id) {
-  struct mg_coap_message cm;
-  memset(&cm, 0, sizeof(cm));
-  cm.msg_type = MG_COAP_MSG_ACK;
-  cm.msg_id = msg_id;
+static const char *s_spec = "2";
+static void (*s_fn)(const void *, size_t, void *) = mg_log_stdout;
+static void *s_fn_param = NULL;
 
-  return mg_coap_send_message(nc, &cm);
+void mg_log_set(const char *spec) {
+  LOG(LL_DEBUG, ("Setting log level to %s", spec));
+  s_spec = spec;
 }
 
-static void coap_handler(struct mg_connection *nc, int ev,
-                         void *ev_data MG_UD_ARG(void *user_data)) {
-  struct mbuf *io = &nc->recv_mbuf;
-  struct mg_coap_message cm;
-  uint32_t parse_res;
+bool mg_log_prefix(int level, const char *file, int line, const char *fname) {
+  // static unsigned long seq;
+  int max = LL_INFO;
+  struct mg_str k, v, s = mg_str(s_spec);
+  const char *p = strrchr(file, '/');
 
-  memset(&cm, 0, sizeof(cm));
+  if (s_fn == NULL) return false;
 
-  nc->handler(nc, ev, ev_data MG_UD_ARG(user_data));
+  if (p == NULL) p = strrchr(file, '\\');
+  p = p == NULL ? file : p + 1;
 
-  switch (ev) {
-    case MG_EV_RECV:
-      parse_res = mg_coap_parse(io, &cm);
-      if ((parse_res & MG_COAP_IGNORE) == 0) {
-        if ((cm.flags & MG_COAP_NOT_ENOUGH_DATA) != 0) {
-          /*
-           * Since we support UDP only
-           * MG_COAP_NOT_ENOUGH_DATA == MG_COAP_FORMAT_ERROR
-           */
-          cm.flags |= MG_COAP_FORMAT_ERROR; /* LCOV_EXCL_LINE */
-        }                                   /* LCOV_EXCL_LINE */
-        nc->handler(nc, MG_COAP_EVENT_BASE + cm.msg_type,
-                    &cm MG_UD_ARG(user_data));
-      }
+  while (mg_commalist(&s, &k, &v)) {
+    if (v.len == 0) max = atoi(k.ptr);
+    if (v.len > 0 && strncmp(p, k.ptr, k.len) == 0) max = atoi(v.ptr);
+  }
 
-      mg_coap_free_options(&cm);
-      mbuf_remove(io, io->len);
-      break;
+  if (level <= max) {
+    char timebuf[21], buf[50] = "";
+    time_t t = time(NULL);
+    struct tm tmp, *tm = gmtime_r(&t, &tmp);
+    int n;
+    (void) tmp;
+    strftime(timebuf, sizeof(timebuf), "%Y-%m-%d %H:%M:%S", tm);
+    n = snprintf(buf, sizeof(buf), "%s %d %s:%d:%s", timebuf, level, p, line,
+                 fname);
+    if (n < 0 || n > (int) sizeof(buf) - 2) n = sizeof(buf) - 2;
+    while (n < (int) sizeof(buf) - 1) buf[n++] = ' ';
+    s_fn(buf, sizeof(buf) - 1, s_fn_param);
+    return true;
+  } else {
+    return false;
   }
 }
-/*
- * Attach built-in CoAP event handler to the given connection.
- *
- * The user-defined event handler will receive following extra events:
- *
- * - MG_EV_COAP_CON
- * - MG_EV_COAP_NOC
- * - MG_EV_COAP_ACK
- * - MG_EV_COAP_RST
- */
-int mg_set_protocol_coap(struct mg_connection *nc) {
-  /* supports UDP only */
-  if ((nc->flags & MG_F_UDP) == 0) {
-    return -1;
-  }
-
-  nc->proto_handler = coap_handler;
 
-  return 0;
+void mg_log(const char *fmt, ...) {
+  char mem[256], *buf = mem;
+  va_list ap;
+  int len = 0;
+  va_start(ap, fmt);
+  len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+  s_fn(buf, len > 0 ? (size_t) len : 0, s_fn_param);
+  s_fn("\n", 1, s_fn_param);
+  if (buf != mem) free(buf);
 }
 
-#endif /* MG_ENABLE_COAP */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_sntp.c"
+void mg_log_set_callback(void (*fn)(const void *, size_t, void *), void *fnd) {
+  s_fn = fn;
+  s_fn_param = fnd;
+}
 #endif
 
-/* Amalgamated: #include "mg_internal.h" */
-/* Amalgamated: #include "mg_sntp.h" */
-/* Amalgamated: #include "mg_util.h" */
+#ifdef MG_ENABLE_LINES
+#line 1 "src/md5.c"
+#endif
+#include <string.h>
 
-#if MG_ENABLE_SNTP
 
-#define SNTP_TIME_OFFSET 2208988800
+#if defined(MG_ENABLE_MD5) && MG_ENABLE_MD5
+#if !defined(BYTE_ORDER) && defined(__BYTE_ORDER)
+#define BYTE_ORDER __BYTE_ORDER
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#endif /* LITTLE_ENDIAN */
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN __LITTLE_ENDIAN
+#endif /* BIG_ENDIAN */
+#endif /* BYTE_ORDER */
 
-#ifndef SNTP_TIMEOUT
-#define SNTP_TIMEOUT 10
+static void mg_byte_reverse(unsigned char *buf, unsigned longs) {
+/* Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN */
+#if BYTE_ORDER == BIG_ENDIAN
+  do {
+    uint32_t t = (uint32_t)((unsigned) buf[3] << 8 | buf[2]) << 16 |
+                 ((unsigned) buf[1] << 8 | buf[0]);
+    *(uint32_t *) buf = t;
+    buf += 4;
+  } while (--longs);
+#else
+  (void) buf;
+  (void) longs;
 #endif
+}
 
-#ifndef SNTP_ATTEMPTS
-#define SNTP_ATTEMPTS 3
-#endif
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
 
-static uint64_t mg_get_sec(uint64_t val) {
-  return (val & 0xFFFFFFFF00000000) >> 32;
-}
+#define MD5STEP(f, w, x, y, z, data, s) \
+  (w += f(x, y, z) + data, w = w << s | w >> (32 - s), w += x)
 
-static uint64_t mg_get_usec(uint64_t val) {
-  uint64_t tmp = (val & 0x00000000FFFFFFFF);
-  tmp *= 1000000;
-  tmp >>= 32;
-  return tmp;
-}
+/*
+ * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void mg_md5_init(mg_md5_ctx *ctx) {
+  ctx->buf[0] = 0x67452301;
+  ctx->buf[1] = 0xefcdab89;
+  ctx->buf[2] = 0x98badcfe;
+  ctx->buf[3] = 0x10325476;
 
-static void mg_ntp_to_tv(uint64_t val, struct timeval *tv) {
-  uint64_t tmp;
-  tmp = mg_get_sec(val);
-  tmp -= SNTP_TIME_OFFSET;
-  tv->tv_sec = tmp;
-  tv->tv_usec = mg_get_usec(val);
+  ctx->bits[0] = 0;
+  ctx->bits[1] = 0;
 }
 
-static void mg_get_ntp_ts(const char *ntp, uint64_t *val) {
-  uint32_t tmp;
-  memcpy(&tmp, ntp, sizeof(tmp));
-  tmp = ntohl(tmp);
-  *val = (uint64_t) tmp << 32;
-  memcpy(&tmp, ntp + 4, sizeof(tmp));
-  tmp = ntohl(tmp);
-  *val |= tmp;
-}
+static void mg_md5_transform(uint32_t buf[4], uint32_t const in[16]) {
+  uint32_t a, b, c, d;
 
-void mg_sntp_send_request(struct mg_connection *c) {
-  uint8_t buf[48] = {0};
-  /*
-   * header - 8 bit:
-   * LI (2 bit) - 3 (not in sync), VN (3 bit) - 4 (version),
-   * mode (3 bit) - 3 (client)
-   */
-  buf[0] = (3 << 6) | (4 << 3) | 3;
+  a = buf[0];
+  b = buf[1];
+  c = buf[2];
+  d = buf[3];
 
-/*
- * Next fields should be empty in client request
- * stratum, 8 bit
- * poll interval, 8 bit
- * rrecision, 8 bit
- * root delay, 32 bit
- * root dispersion, 32 bit
- * ref id, 32 bit
- * ref timestamp, 64 bit
- * originate Timestamp, 64 bit
- * receive Timestamp, 64 bit
-*/
+  MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+  MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+  MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+  MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+  MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+  MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+  MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+  MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+  MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+  MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+  MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+  MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+  MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+  MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+  MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+  MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
 
-/*
- * convert time to sntp format (sntp starts from 00:00:00 01.01.1900)
- * according to rfc868 it is 2208988800L sec
- * this information is used to correct roundtrip delay
- * but if local clock is absolutely broken (and doesn't work even
- * as simple timer), it is better to disable it
-*/
-#ifndef MG_SNTP_NO_DELAY_CORRECTION
-  uint32_t sec;
-  sec = htonl((uint32_t)(mg_time() + SNTP_TIME_OFFSET));
-  memcpy(&buf[40], &sec, sizeof(sec));
-#endif
+  MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+  MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+  MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+  MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+  MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+  MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+  MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+  MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+  MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+  MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+  MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+  MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+  MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+  MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+  MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+  MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
 
-  mg_send(c, buf, sizeof(buf));
-}
+  MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+  MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+  MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+  MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+  MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+  MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+  MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+  MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+  MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+  MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+  MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+  MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+  MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+  MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+  MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+  MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
 
-#ifndef MG_SNTP_NO_DELAY_CORRECTION
-static uint64_t mg_calculate_delay(uint64_t t1, uint64_t t2, uint64_t t3) {
-  /* roundloop delay = (T4 - T1) - (T3 - T2) */
-  uint64_t d1 = ((mg_time() + SNTP_TIME_OFFSET) * 1000000) -
-                (mg_get_sec(t1) * 1000000 + mg_get_usec(t1));
-  uint64_t d2 = (mg_get_sec(t3) * 1000000 + mg_get_usec(t3)) -
-                (mg_get_sec(t2) * 1000000 + mg_get_usec(t2));
+  MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+  MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+  MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+  MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+  MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+  MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+  MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+  MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+  MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+  MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+  MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+  MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+  MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+  MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+  MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+  MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
 
-  return (d1 > d2) ? d1 - d2 : 0;
+  buf[0] += a;
+  buf[1] += b;
+  buf[2] += c;
+  buf[3] += d;
 }
-#endif
 
-MG_INTERNAL int mg_sntp_parse_reply(const char *buf, int len,
-                                    struct mg_sntp_message *msg) {
-  uint8_t hdr;
-  uint64_t trsm_ts_T3, delay = 0;
-  int mode;
-  struct timeval tv;
+void mg_md5_update(mg_md5_ctx *ctx, const unsigned char *buf, size_t len) {
+  uint32_t t;
 
-  if (len < 48) {
-    return -1;
-  }
+  t = ctx->bits[0];
+  if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t) ctx->bits[1]++;
+  ctx->bits[1] += (uint32_t) len >> 29;
 
-  hdr = buf[0];
+  t = (t >> 3) & 0x3f;
 
-  if ((hdr & 0x38) >> 3 != 4) {
-    /* Wrong version */
-    return -1;
-  }
+  if (t) {
+    unsigned char *p = (unsigned char *) ctx->in + t;
 
-  mode = hdr & 0x7;
-  if (mode != 4 && mode != 5) {
-    /* Not a server reply */
-    return -1;
+    t = 64 - t;
+    if (len < t) {
+      memcpy(p, buf, len);
+      return;
+    }
+    memcpy(p, buf, t);
+    mg_byte_reverse(ctx->in, 16);
+    mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += t;
+    len -= t;
   }
 
-  memset(msg, 0, sizeof(*msg));
-
-  msg->kiss_of_death = (buf[1] == 0); /* Server asks to not send requests */
-
-  mg_get_ntp_ts(&buf[40], &trsm_ts_T3);
-
-#ifndef MG_SNTP_NO_DELAY_CORRECTION
-  {
-    uint64_t orig_ts_T1, recv_ts_T2;
-    mg_get_ntp_ts(&buf[24], &orig_ts_T1);
-    mg_get_ntp_ts(&buf[32], &recv_ts_T2);
-    delay = mg_calculate_delay(orig_ts_T1, recv_ts_T2, trsm_ts_T3);
+  while (len >= 64) {
+    memcpy(ctx->in, buf, 64);
+    mg_byte_reverse(ctx->in, 16);
+    mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += 64;
+    len -= 64;
   }
-#endif
-
-  mg_ntp_to_tv(trsm_ts_T3, &tv);
 
-  msg->time = (double) tv.tv_sec + (((double) tv.tv_usec + delay) / 1000000.0);
-
-  return 0;
+  memcpy(ctx->in, buf, len);
 }
 
-static void mg_sntp_handler(struct mg_connection *c, int ev,
-                            void *ev_data MG_UD_ARG(void *user_data)) {
-  struct mbuf *io = &c->recv_mbuf;
-  struct mg_sntp_message msg;
-
-  c->handler(c, ev, ev_data MG_UD_ARG(user_data));
-
-  switch (ev) {
-    case MG_EV_RECV: {
-      if (mg_sntp_parse_reply(io->buf, io->len, &msg) < 0) {
-        DBG(("Invalid SNTP packet received (%d)", (int) io->len));
-        c->handler(c, MG_SNTP_MALFORMED_REPLY, NULL MG_UD_ARG(user_data));
-      } else {
-        c->handler(c, MG_SNTP_REPLY, (void *) &msg MG_UD_ARG(user_data));
-      }
+void mg_md5_final(mg_md5_ctx *ctx, unsigned char digest[16]) {
+  unsigned count;
+  unsigned char *p;
+  uint32_t *a;
 
-      mbuf_remove(io, io->len);
-      break;
-    }
-  }
-}
+  count = (ctx->bits[0] >> 3) & 0x3F;
 
-int mg_set_protocol_sntp(struct mg_connection *c) {
-  if ((c->flags & MG_F_UDP) == 0) {
-    return -1;
+  p = ctx->in + count;
+  *p++ = 0x80;
+  count = 64 - 1 - count;
+  if (count < 8) {
+    memset(p, 0, count);
+    mg_byte_reverse(ctx->in, 16);
+    mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+    memset(ctx->in, 0, 56);
+  } else {
+    memset(p, 0, count - 8);
   }
+  mg_byte_reverse(ctx->in, 14);
 
-  c->proto_handler = mg_sntp_handler;
+  a = (uint32_t *) ctx->in;
+  a[14] = ctx->bits[0];
+  a[15] = ctx->bits[1];
 
-  return 0;
+  mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+  mg_byte_reverse((unsigned char *) ctx->buf, 4);
+  memcpy(digest, ctx->buf, 16);
+  memset((char *) ctx, 0, sizeof(*ctx));
 }
+#endif
 
-struct mg_connection *mg_sntp_connect(struct mg_mgr *mgr,
-                                      MG_CB(mg_event_handler_t event_handler,
-                                            void *user_data),
-                                      const char *sntp_server_name) {
-  struct mg_connection *c = NULL;
-  char url[100], *p_url = url;
-  const char *proto = "", *port = "", *tmp;
+#ifdef MG_ENABLE_LINES
+#line 1 "src/mqtt.c"
+#endif
 
-  /* If port is not specified, use default (123) */
-  tmp = strchr(sntp_server_name, ':');
-  if (tmp != NULL && *(tmp + 1) == '/') {
-    tmp = strchr(tmp + 1, ':');
-  }
 
-  if (tmp == NULL) {
-    port = ":123";
-  }
 
-  /* Add udp:// if needed */
-  if (strncmp(sntp_server_name, "udp://", 6) != 0) {
-    proto = "udp://";
-  }
 
-  mg_asprintf(&p_url, sizeof(url), "%s%s%s", proto, sntp_server_name, port);
 
-  c = mg_connect(mgr, p_url, event_handler MG_UD_ARG(user_data));
 
-  if (c == NULL) {
-    goto cleanup;
-  }
 
-  mg_set_protocol_sntp(c);
 
-cleanup:
-  if (p_url != url) {
-    MG_FREE(p_url);
-  }
+#define MQTT_CLEAN_SESSION 0x02
+#define MQTT_HAS_WILL 0x04
+#define MQTT_WILL_RETAIN 0x20
+#define MQTT_HAS_PASSWORD 0x40
+#define MQTT_HAS_USER_NAME 0x80
 
-  return c;
-}
+enum { MQTT_OK, MQTT_INCOMPLETE, MQTT_MALFORMED };
 
-struct sntp_data {
-  mg_event_handler_t hander;
-  int count;
-};
+void mg_mqtt_send_header(struct mg_connection *c, uint8_t cmd, uint8_t flags,
+                         uint32_t len) {
+  uint8_t buf[1 + sizeof(len)], *vlen = &buf[1];
+  buf[0] = (uint8_t) ((cmd << 4) | flags);
+  do {
+    *vlen = len % 0x80;
+    len /= 0x80;
+    if (len > 0) *vlen |= 0x80;
+    vlen++;
+  } while (len > 0 && vlen < &buf[sizeof(buf)]);
+  mg_send(c, buf, (size_t) (vlen - buf));
+}
+
+static void mg_send_u16(struct mg_connection *c, uint16_t value) {
+  mg_send(c, &value, sizeof(value));
+}
+
+void mg_mqtt_login(struct mg_connection *c, struct mg_mqtt_opts *opts) {
+  char rnd[9], client_id[16];
+  struct mg_str cid = opts->client_id;
+  uint32_t total_len = 7 + 1 + 2 + 2;
+  uint8_t connflag = (uint8_t) ((opts->will_qos & 3) << 3);
+
+  if (cid.len == 0) {
+    mg_random(rnd, sizeof(rnd));
+    mg_base64_encode((unsigned char *) rnd, sizeof(rnd), client_id);
+    client_id[sizeof(client_id) - 1] = '\0';
+    cid = mg_str(client_id);
+  }
+
+  if (opts->user.len > 0) {
+    total_len += 2 + (uint32_t) opts->user.len;
+    connflag |= MQTT_HAS_USER_NAME;
+  }
+  if (opts->pass.len > 0) {
+    total_len += 2 + (uint32_t) opts->pass.len;
+    connflag |= MQTT_HAS_PASSWORD;
+  }
+  if (opts->will_topic.len > 0 && opts->will_message.len > 0) {
+    total_len +=
+        4 + (uint32_t) opts->will_topic.len + (uint32_t) opts->will_message.len;
+    connflag |= MQTT_HAS_WILL;
+  }
+  if (opts->clean || cid.len == 0) connflag |= MQTT_CLEAN_SESSION;
+  if (opts->will_retain) connflag |= MQTT_WILL_RETAIN;
+  total_len += (uint32_t) cid.len;
+
+  mg_mqtt_send_header(c, MQTT_CMD_CONNECT, 0, total_len);
+  mg_send(c, "\00\04MQTT\04", 7);
+  mg_send(c, &connflag, sizeof(connflag));
+  // keepalive == 0 means "do not disconnect us!"
+  mg_send_u16(c, mg_htons((uint16_t) opts->keepalive));
+  mg_send_u16(c, mg_htons((uint16_t) cid.len));
+  mg_send(c, cid.ptr, cid.len);
+  if (connflag & MQTT_HAS_WILL) {
+    mg_send_u16(c, mg_htons((uint16_t) opts->will_topic.len));
+    mg_send(c, opts->will_topic.ptr, opts->will_topic.len);
+    mg_send_u16(c, mg_htons((uint16_t) opts->will_message.len));
+    mg_send(c, opts->will_message.ptr, opts->will_message.len);
+  }
+  if (opts->user.len > 0) {
+    mg_send_u16(c, mg_htons((uint16_t) opts->user.len));
+    mg_send(c, opts->user.ptr, opts->user.len);
+  }
+  if (opts->pass.len > 0) {
+    mg_send_u16(c, mg_htons((uint16_t) opts->pass.len));
+    mg_send(c, opts->pass.ptr, opts->pass.len);
+  }
+}
+
+void mg_mqtt_pub(struct mg_connection *c, struct mg_str topic,
+                 struct mg_str data, int qos, bool retain) {
+  uint8_t flags = (uint8_t) (((qos & 3) << 1) | (retain ? 1 : 0));
+  uint32_t total_len = 2 + (uint32_t) topic.len + (uint32_t) data.len;
+  LOG(LL_DEBUG, ("%lu [%.*s] -> [%.*s]", c->id, (int) topic.len,
+                 (char *) topic.ptr, (int) data.len, (char *) data.ptr));
+  if (qos > 0) total_len += 2;
+  mg_mqtt_send_header(c, MQTT_CMD_PUBLISH, flags, total_len);
+  mg_send_u16(c, mg_htons((uint16_t) topic.len));
+  mg_send(c, topic.ptr, topic.len);
+  if (qos > 0) {
+    static uint16_t s_id;
+    if (++s_id == 0) s_id++;
+    mg_send_u16(c, mg_htons(s_id));
+  }
+  mg_send(c, data.ptr, data.len);
+}
+
+void mg_mqtt_sub(struct mg_connection *c, struct mg_str topic, int qos) {
+  static uint16_t s_id;
+  uint8_t qos_ = qos & 3;
+  uint32_t total_len = 2 + (uint32_t) topic.len + 2 + 1;
+  mg_mqtt_send_header(c, MQTT_CMD_SUBSCRIBE, 2, total_len);
+  if (++s_id == 0) ++s_id;
+  mg_send_u16(c, mg_htons(s_id));
+  mg_send_u16(c, mg_htons((uint16_t) topic.len));
+  mg_send(c, topic.ptr, topic.len);
+  mg_send(c, &qos_, sizeof(qos_));
+}
+
+int mg_mqtt_parse(const uint8_t *buf, size_t len, struct mg_mqtt_message *m) {
+  uint8_t lc = 0, *p, *end;
+  uint32_t n = 0, len_len = 0;
 
-static void mg_sntp_util_ev_handler(struct mg_connection *c, int ev,
-                                    void *ev_data MG_UD_ARG(void *user_data)) {
-#if !MG_ENABLE_CALLBACK_USERDATA
-  void *user_data = c->user_data;
-#endif
-  struct sntp_data *sd = (struct sntp_data *) user_data;
+  memset(m, 0, sizeof(*m));
+  m->dgram.ptr = (char *) buf;
+  if (len < 2) return MQTT_INCOMPLETE;
+  m->cmd = (uint8_t) (buf[0] >> 4);
+  m->qos = (buf[0] >> 1) & 3;
+
+  n = len_len = 0;
+  p = (uint8_t *) buf + 1;
+  while ((size_t) (p - buf) < len) {
+    lc = *((uint8_t *) p++);
+    n += (uint32_t) ((lc & 0x7f) << 7 * len_len);
+    len_len++;
+    if (!(lc & 0x80)) break;
+    if (len_len >= 4) return MQTT_MALFORMED;
+  }
+  end = p + n;
+  if (lc & 0x80 || end > buf + len) return MQTT_INCOMPLETE;
+  m->dgram.len = (size_t) (end - buf);
 
-  switch (ev) {
-    case MG_EV_CONNECT:
-      if (*(int *) ev_data != 0) {
-        mg_call(c, sd->hander, c->user_data, MG_SNTP_FAILED, NULL);
-        break;
-      }
-    /* fallthrough */
-    case MG_EV_TIMER:
-      if (sd->count <= SNTP_ATTEMPTS) {
-        mg_sntp_send_request(c);
-        mg_set_timer(c, mg_time() + 10);
-        sd->count++;
-      } else {
-        mg_call(c, sd->hander, c->user_data, MG_SNTP_FAILED, NULL);
-        c->flags |= MG_F_CLOSE_IMMEDIATELY;
-      }
+  switch (m->cmd) {
+    case MQTT_CMD_CONNACK:
+      if (end - p < 2) return MQTT_MALFORMED;
+      m->ack = p[1];
+      break;
+    case MQTT_CMD_PUBACK:
+    case MQTT_CMD_PUBREC:
+    case MQTT_CMD_PUBREL:
+    case MQTT_CMD_PUBCOMP:
+    case MQTT_CMD_SUBACK:
+      if (p + 2 > end) return MQTT_MALFORMED;
+      m->id = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
       break;
-    case MG_SNTP_MALFORMED_REPLY:
-      mg_call(c, sd->hander, c->user_data, MG_SNTP_FAILED, NULL);
-      c->flags |= MG_F_CLOSE_IMMEDIATELY;
+    case MQTT_CMD_SUBSCRIBE: {
+      if (p + 2 > end) return MQTT_MALFORMED;
+      m->id = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+      p += 2;
       break;
-    case MG_SNTP_REPLY:
-      mg_call(c, sd->hander, c->user_data, MG_SNTP_REPLY, ev_data);
-      c->flags |= MG_F_CLOSE_IMMEDIATELY;
+    }
+    case MQTT_CMD_PUBLISH: {
+      if (p + 2 > end) return MQTT_MALFORMED;
+      m->topic.len = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+      m->topic.ptr = (char *) p + 2;
+      p += 2 + m->topic.len;
+      if (p > end) return MQTT_MALFORMED;
+      if (m->qos > 0) {
+        if (p + 2 > end) return MQTT_MALFORMED;
+        m->id = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+        p += 2;
+      }
+      if (p > end) return MQTT_MALFORMED;
+      m->data.ptr = (char *) p;
+      m->data.len = (size_t) (end - p);
       break;
-    case MG_EV_CLOSE:
-      MG_FREE(user_data);
-      c->user_data = NULL;
+    }
+    default:
       break;
   }
+  return MQTT_OK;
 }
 
-struct mg_connection *mg_sntp_get_time(struct mg_mgr *mgr,
-                                       mg_event_handler_t event_handler,
-                                       const char *sntp_server_name) {
-  struct mg_connection *c;
-  struct sntp_data *sd = (struct sntp_data *) MG_CALLOC(1, sizeof(*sd));
-  if (sd == NULL) {
-    return NULL;
-  }
-
-  c = mg_sntp_connect(mgr, MG_CB(mg_sntp_util_ev_handler, sd),
-                      sntp_server_name);
-  if (c == NULL) {
-    MG_FREE(sd);
-    return NULL;
-  }
-
-  sd->hander = event_handler;
-#if !MG_ENABLE_CALLBACK_USERDATA
-  c->user_data = sd;
-#endif
+static size_t mg_mqtt_next_topic(struct mg_mqtt_message *msg,
+                                 struct mg_str *topic, uint8_t *qos,
+                                 size_t pos) {
+  unsigned char *buf = (unsigned char *) msg->dgram.ptr + pos;
+  size_t new_pos;
+  if (pos >= msg->dgram.len) return 0;
 
-  return c;
+  topic->len = (size_t) (((unsigned) buf[0]) << 8 | buf[1]);
+  topic->ptr = (char *) buf + 2;
+  new_pos = pos + 2 + topic->len + (qos == NULL ? 0 : 1);
+  if ((size_t) new_pos > msg->dgram.len) return 0;
+  if (qos != NULL) *qos = buf[2 + topic->len];
+  return new_pos;
 }
 
-#endif /* MG_ENABLE_SNTP */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_socks.c"
-#endif
-
-#if MG_ENABLE_SOCKS
-
-/* Amalgamated: #include "mg_socks.h" */
-/* Amalgamated: #include "mg_internal.h" */
-
-/*
- *  https://www.ietf.org/rfc/rfc1928.txt paragraph 3, handle client handshake
- *
- *  +----+----------+----------+
- *  |VER | NMETHODS | METHODS  |
- *  +----+----------+----------+
- *  | 1  |    1     | 1 to 255 |
- *  +----+----------+----------+
- */
-static void mg_socks5_handshake(struct mg_connection *c) {
-  struct mbuf *r = &c->recv_mbuf;
-  if (r->buf[0] != MG_SOCKS_VERSION) {
-    c->flags |= MG_F_CLOSE_IMMEDIATELY;
-  } else if (r->len > 2 && (size_t) r->buf[1] + 2 <= r->len) {
-    /* https://www.ietf.org/rfc/rfc1928.txt paragraph 3 */
-    unsigned char reply[2] = {MG_SOCKS_VERSION, MG_SOCKS_HANDSHAKE_FAILURE};
-    int i;
-    for (i = 2; i < r->buf[1] + 2; i++) {
-      /* TODO(lsm): support other auth methods */
-      if (r->buf[i] == MG_SOCKS_HANDSHAKE_NOAUTH) reply[1] = r->buf[i];
-    }
-    mbuf_remove(r, 2 + r->buf[1]);
-    mg_send(c, reply, sizeof(reply));
-    c->flags |= MG_SOCKS_HANDSHAKE_DONE; /* Mark handshake done */
-  }
+size_t mg_mqtt_next_sub(struct mg_mqtt_message *msg, struct mg_str *topic,
+                        uint8_t *qos, size_t pos) {
+  uint8_t tmp;
+  return mg_mqtt_next_topic(msg, topic, qos == NULL ? &tmp : qos, pos);
 }
 
-static void disband(struct mg_connection *c) {
-  struct mg_connection *c2 = (struct mg_connection *) c->user_data;
-  if (c2 != NULL) {
-    c2->flags |= MG_F_SEND_AND_CLOSE;
-    c2->user_data = NULL;
-  }
-  c->flags |= MG_F_SEND_AND_CLOSE;
-  c->user_data = NULL;
+size_t mg_mqtt_next_unsub(struct mg_mqtt_message *msg, struct mg_str *topic,
+                          size_t pos) {
+  return mg_mqtt_next_topic(msg, topic, NULL, pos);
 }
 
-static void relay_data(struct mg_connection *c) {
-  struct mg_connection *c2 = (struct mg_connection *) c->user_data;
-  if (c2 != NULL) {
-    mg_send(c2, c->recv_mbuf.buf, c->recv_mbuf.len);
-    mbuf_remove(&c->recv_mbuf, c->recv_mbuf.len);
-  } else {
-    c->flags |= MG_F_SEND_AND_CLOSE;
+static void mqtt_cb(struct mg_connection *c, int ev, void *ev_data,
+                    void *fn_data) {
+  if (ev == MG_EV_READ) {
+    for (;;) {
+      struct mg_mqtt_message mm;
+      int rc = mg_mqtt_parse(c->recv.buf, c->recv.len, &mm);
+      if (rc == MQTT_MALFORMED) {
+        LOG(LL_ERROR, ("%lu MQTT malformed message", c->id));
+        c->is_closing = 1;
+        break;
+      } else if (rc == MQTT_OK) {
+        LOG(LL_VERBOSE_DEBUG,
+            ("%p MQTT CMD %d len %d [%.*s]", c->fd, mm.cmd, (int) mm.dgram.len,
+             (int) mm.data.len, mm.data.ptr));
+        switch (mm.cmd) {
+          case MQTT_CMD_CONNACK:
+            mg_call(c, MG_EV_MQTT_OPEN, &mm.ack);
+            if (mm.ack == 0) {
+              LOG(LL_DEBUG, ("%lu Connected", c->id));
+            } else {
+              LOG(LL_ERROR, ("%lu MQTT auth failed, code %d", c->id, mm.ack));
+              c->is_closing = 1;
+            }
+            break;
+          case MQTT_CMD_PUBLISH: {
+            LOG(LL_DEBUG, ("%lu [%.*s] -> [%.*s]", c->id, (int) mm.topic.len,
+                           mm.topic.ptr, (int) mm.data.len, mm.data.ptr));
+            mg_call(c, MG_EV_MQTT_MSG, &mm);
+            break;
+          }
+        }
+        mg_call(c, MG_EV_MQTT_CMD, &mm);
+        mg_iobuf_del(&c->recv, 0, mm.dgram.len);
+      } else {
+        break;
+      }
+    }
   }
+  (void) ev_data;
+  (void) fn_data;
 }
 
-static void serv_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
-  if (ev == MG_EV_CLOSE) {
-    disband(c);
-  } else if (ev == MG_EV_RECV) {
-    relay_data(c);
-  } else if (ev == MG_EV_CONNECT) {
-    int res = *(int *) ev_data;
-    if (res != 0) LOG(LL_ERROR, ("connect error: %d", res));
-  }
+void mg_mqtt_ping(struct mg_connection *nc) {
+  mg_mqtt_send_header(nc, MQTT_CMD_PINGREQ, 0, 0);
 }
 
-static void mg_socks5_connect(struct mg_connection *c, const char *addr) {
-  struct mg_connection *serv = mg_connect(c->mgr, addr, serv_ev_handler);
-  serv->user_data = c;
-  c->user_data = serv;
+void mg_mqtt_pong(struct mg_connection *nc) {
+  mg_mqtt_send_header(nc, MQTT_CMD_PINGRESP, 0, 0);
 }
 
-/*
- *  Request, https://www.ietf.org/rfc/rfc1928.txt paragraph 4
- *
- *  +----+-----+-------+------+----------+----------+
- *  |VER | CMD |  RSV  | ATYP | DST.ADDR | DST.PORT |
- *  +----+-----+-------+------+----------+----------+
- *  | 1  |  1  | X'00' |  1   | Variable |    2     |
- *  +----+-----+-------+------+----------+----------+
- */
-static void mg_socks5_handle_request(struct mg_connection *c) {
-  struct mbuf *r = &c->recv_mbuf;
-  unsigned char *p = (unsigned char *) r->buf;
-  unsigned char addr_len = 4, reply = MG_SOCKS_SUCCESS;
-  int ver, cmd, atyp;
-  char addr[300];
-
-  if (r->len < 8) return; /* return if not fully buffered. min DST.ADDR is 2 */
-  ver = p[0];
-  cmd = p[1];
-  atyp = p[3];
-
-  /* TODO(lsm): support other commands */
-  if (ver != MG_SOCKS_VERSION || cmd != MG_SOCKS_CMD_CONNECT) {
-    reply = MG_SOCKS_CMD_NOT_SUPPORTED;
-  } else if (atyp == MG_SOCKS_ADDR_IPV4) {
-    addr_len = 4;
-    if (r->len < (size_t) addr_len + 6) return; /* return if not buffered */
-    snprintf(addr, sizeof(addr), "%d.%d.%d.%d:%d", p[4], p[5], p[6], p[7],
-             p[8] << 8 | p[9]);
-    mg_socks5_connect(c, addr);
-  } else if (atyp == MG_SOCKS_ADDR_IPV6) {
-    addr_len = 16;
-    if (r->len < (size_t) addr_len + 6) return; /* return if not buffered */
-    snprintf(addr, sizeof(addr), "[%x:%x:%x:%x:%x:%x:%x:%x]:%d",
-             p[4] << 8 | p[5], p[6] << 8 | p[7], p[8] << 8 | p[9],
-             p[10] << 8 | p[11], p[12] << 8 | p[13], p[14] << 8 | p[15],
-             p[16] << 8 | p[17], p[18] << 8 | p[19], p[20] << 8 | p[21]);
-    mg_socks5_connect(c, addr);
-  } else if (atyp == MG_SOCKS_ADDR_DOMAIN) {
-    addr_len = p[4] + 1;
-    if (r->len < (size_t) addr_len + 6) return; /* return if not buffered */
-    snprintf(addr, sizeof(addr), "%.*s:%d", p[4], p + 5,
-             p[4 + addr_len] << 8 | p[4 + addr_len + 1]);
-    mg_socks5_connect(c, addr);
-  } else {
-    reply = MG_SOCKS_ADDR_NOT_SUPPORTED;
-  }
-
-  /*
-   *  Reply, https://www.ietf.org/rfc/rfc1928.txt paragraph 5
-   *
-   *  +----+-----+-------+------+----------+----------+
-   *  |VER | REP |  RSV  | ATYP | BND.ADDR | BND.PORT |
-   *  +----+-----+-------+------+----------+----------+
-   *  | 1  |  1  | X'00' |  1   | Variable |    2     |
-   *  +----+-----+-------+------+----------+----------+
-   */
-  {
-    unsigned char buf[] = {MG_SOCKS_VERSION, reply, 0};
-    mg_send(c, buf, sizeof(buf));
-  }
-  mg_send(c, r->buf + 3, addr_len + 1 + 2);
-
-  mbuf_remove(r, 6 + addr_len);      /* Remove request from the input stream */
-  c->flags |= MG_SOCKS_CONNECT_DONE; /* Mark ourselves as connected */
+void mg_mqtt_disconnect(struct mg_connection *nc) {
+  mg_mqtt_send_header(nc, MQTT_CMD_DISCONNECT, 0, 0);
 }
 
-static void socks_handler(struct mg_connection *c, int ev, void *ev_data) {
-  if (ev == MG_EV_RECV) {
-    if (!(c->flags & MG_SOCKS_HANDSHAKE_DONE)) mg_socks5_handshake(c);
-    if (c->flags & MG_SOCKS_HANDSHAKE_DONE &&
-        !(c->flags & MG_SOCKS_CONNECT_DONE)) {
-      mg_socks5_handle_request(c);
-    }
-    if (c->flags & MG_SOCKS_CONNECT_DONE) relay_data(c);
-  } else if (ev == MG_EV_CLOSE) {
-    disband(c);
+struct mg_connection *mg_mqtt_connect(struct mg_mgr *mgr, const char *url,
+                                      struct mg_mqtt_opts *opts,
+                                      mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_connect(mgr, url, fn, fn_data);
+  if (c != NULL) {
+    struct mg_mqtt_opts empty;
+    memset(&empty, 0, sizeof(empty));
+    mg_mqtt_login(c, opts == NULL ? &empty : opts);
+    c->pfn = mqtt_cb;
   }
-  (void) ev_data;
-}
-
-void mg_set_protocol_socks(struct mg_connection *c) {
-  c->proto_handler = socks_handler;
+  return c;
 }
-#endif
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/cc3200/cc3200_libc.c"
-#endif
-
-#if CS_PLATFORM == CS_P_CC3200
 
-/* Amalgamated: #include "common/mg_mem.h" */
-#include <stdio.h>
-#include <string.h>
+struct mg_connection *mg_mqtt_listen(struct mg_mgr *mgr, const char *url,
+                                     mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_listen(mgr, url, fn, fn_data);
+  if (c != NULL) c->pfn = mqtt_cb, c->pfn_data = mgr;
+  return c;
+}
 
-#ifndef __TI_COMPILER_VERSION__
-#include <reent.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <unistd.h>
+#ifdef MG_ENABLE_LINES
+#line 1 "src/net.c"
 #endif
 
-#include <inc/hw_types.h>
-#include <inc/hw_memmap.h>
-#include <driverlib/prcm.h>
-#include <driverlib/rom.h>
-#include <driverlib/rom_map.h>
-#include <driverlib/uart.h>
-#include <driverlib/utils.h>
 
-#define CONSOLE_UART UARTA0_BASE
 
-#ifdef __TI_COMPILER_VERSION__
-int asprintf(char **strp, const char *fmt, ...) {
-  va_list ap;
-  int len;
 
-  *strp = MG_MALLOC(BUFSIZ);
-  if (*strp == NULL) return -1;
+int mg_vprintf(struct mg_connection *c, const char *fmt, va_list ap) {
+  char mem[256], *buf = mem;
+  int len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  len = mg_send(c, buf, len > 0 ? (size_t) len : 0);
+  if (buf != mem) free(buf);
+  return len;
+}
 
+int mg_printf(struct mg_connection *c, const char *fmt, ...) {
+  int len = 0;
+  va_list ap;
   va_start(ap, fmt);
-  len = vsnprintf(*strp, BUFSIZ, fmt, ap);
+  len = mg_vprintf(c, fmt, ap);
   va_end(ap);
-
-  if (len > 0) {
-    *strp = MG_REALLOC(*strp, len + 1);
-    if (*strp == NULL) return -1;
-  }
-
-  if (len >= BUFSIZ) {
-    va_start(ap, fmt);
-    len = vsnprintf(*strp, len + 1, fmt, ap);
-    va_end(ap);
-  }
-
   return len;
 }
 
-#if MG_TI_NO_HOST_INTERFACE
-time_t HOSTtime() {
-  struct timeval tp;
-  gettimeofday(&tp, NULL);
-  return tp.tv_sec;
+char *mg_straddr(struct mg_addr *a, char *buf, size_t len) {
+  char tmp[30];
+  const char *fmt = a->is_ip6 ? "[%s]:%d" : "%s:%d";
+  mg_ntoa(a, tmp, sizeof(tmp));
+  snprintf(buf, len, fmt, tmp, (int) mg_ntohs(a->port));
+  return buf;
 }
-#endif
 
-#endif /* __TI_COMPILER_VERSION__ */
-
-void fprint_str(FILE *fp, const char *str) {
-  while (*str != '\0') {
-    if (*str == '\n') MAP_UARTCharPut(CONSOLE_UART, '\r');
-    MAP_UARTCharPut(CONSOLE_UART, *str++);
+char *mg_ntoa(const struct mg_addr *addr, char *buf, size_t len) {
+  if (addr->is_ip6) {
+    uint16_t *p = (uint16_t *) addr->ip6;
+    snprintf(buf, len, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", mg_htons(p[0]),
+             mg_htons(p[1]), mg_htons(p[2]), mg_htons(p[3]), mg_htons(p[4]),
+             mg_htons(p[5]), mg_htons(p[6]), mg_htons(p[7]));
+  } else {
+    uint8_t p[4];
+    memcpy(p, &addr->ip, sizeof(p));
+    snprintf(buf, len, "%d.%d.%d.%d", (int) p[0], (int) p[1], (int) p[2],
+             (int) p[3]);
   }
+  return buf;
 }
 
-void _exit(int status) {
-  fprint_str(stderr, "_exit\n");
-  /* cause an unaligned access exception, that will drop you into gdb */
-  *(int *) 1 = status;
-  while (1)
-    ; /* avoid gcc warning because stdlib abort() has noreturn attribute */
+static bool mg_atonl(struct mg_str str, struct mg_addr *addr) {
+  if (mg_vcasecmp(&str, "localhost") != 0) return false;
+  addr->ip = mg_htonl(0x7f000001);
+  addr->is_ip6 = false;
+  return true;
 }
 
-void _not_implemented(const char *what) {
-  fprint_str(stderr, what);
-  fprint_str(stderr, " is not implemented\n");
-  _exit(42);
+static bool mg_atone(struct mg_str str, struct mg_addr *addr) {
+  if (str.len > 0) return false;
+  addr->ip = 0;
+  addr->is_ip6 = false;
+  return true;
 }
 
-int _kill(int pid, int sig) {
-  (void) pid;
-  (void) sig;
-  _not_implemented("_kill");
-  return -1;
+static bool mg_aton4(struct mg_str str, struct mg_addr *addr) {
+  uint8_t data[4] = {0, 0, 0, 0};
+  size_t i, num_dots = 0;
+  for (i = 0; i < str.len; i++) {
+    if (str.ptr[i] >= '0' && str.ptr[i] <= '9') {
+      int octet = data[num_dots] * 10 + (str.ptr[i] - '0');
+      if (octet > 255) return false;
+      data[num_dots] = (uint8_t) octet;
+    } else if (str.ptr[i] == '.') {
+      if (num_dots >= 3 || i == 0 || str.ptr[i - 1] == '.') return false;
+      num_dots++;
+    } else {
+      return false;
+    }
+  }
+  if (num_dots != 3 || str.ptr[i - 1] == '.') return false;
+  memcpy(&addr->ip, data, sizeof(data));
+  addr->is_ip6 = false;
+  return true;
 }
 
-int _getpid() {
-  fprint_str(stderr, "_getpid is not implemented\n");
-  return 42;
+static bool mg_v4mapped(struct mg_str str, struct mg_addr *addr) {
+  int i;
+  if (str.len < 14) return false;
+  if (str.ptr[0] != ':' || str.ptr[1] != ':' || str.ptr[6] != ':') return false;
+  for (i = 2; i < 6; i++) {
+    if (str.ptr[i] != 'f' && str.ptr[i] != 'F') return false;
+  }
+  if (!mg_aton4(mg_str_n(&str.ptr[7], str.len - 7), addr)) return false;
+  memset(addr->ip6, 0, sizeof(addr->ip6));
+  addr->ip6[10] = addr->ip6[11] = 255;
+  memcpy(&addr->ip6[12], &addr->ip, 4);
+  addr->is_ip6 = true;
+  return true;
 }
 
-int _isatty(int fd) {
-  /* 0, 1 and 2 are TTYs. */
-  return fd < 2;
+static bool mg_aton6(struct mg_str str, struct mg_addr *addr) {
+  size_t i, j = 0, n = 0, dc = 42;
+  if (str.len > 2 && str.ptr[0] == '[') str.ptr++, str.len -= 2;
+  if (mg_v4mapped(str, addr)) return true;
+  for (i = 0; i < str.len; i++) {
+    if ((str.ptr[i] >= '0' && str.ptr[i] <= '9') ||
+        (str.ptr[i] >= 'a' && str.ptr[i] <= 'f') ||
+        (str.ptr[i] >= 'A' && str.ptr[i] <= 'F')) {
+      unsigned long val;
+      if (i > j + 3) return false;
+      // LOG(LL_DEBUG, ("%zu %zu [%.*s]", i, j, (int) (i - j + 1),
+      // &str.ptr[j]));
+      val = mg_unhexn(&str.ptr[j], i - j + 1);
+      addr->ip6[n] = (uint8_t) ((val >> 8) & 255);
+      addr->ip6[n + 1] = (uint8_t) (val & 255);
+    } else if (str.ptr[i] == ':') {
+      j = i + 1;
+      if (i > 0 && str.ptr[i - 1] == ':') {
+        dc = n;  // Double colon
+        if (i > 1 && str.ptr[i - 2] == ':') return false;
+      } else if (i > 0) {
+        n += 2;
+      }
+      if (n > 14) return false;
+      addr->ip6[n] = addr->ip6[n + 1] = 0;  // For trailing ::
+    } else {
+      return false;
+    }
+  }
+  if (n < 14 && dc == 42) return false;
+  if (n < 14) {
+    memmove(&addr->ip6[dc + (14 - n)], &addr->ip6[dc], n - dc + 2);
+    memset(&addr->ip6[dc], 0, 14 - n);
+  }
+  addr->is_ip6 = true;
+  return true;
 }
 
-#endif /* CS_PLATFORM == CS_P_CC3200 */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/msp432/msp432_libc.c"
-#endif
-
-#if CS_PLATFORM == CS_P_MSP432
-
-#include <ti/sysbios/BIOS.h>
-#include <ti/sysbios/knl/Clock.h>
-
-int gettimeofday(struct timeval *tp, void *tzp) {
-  uint32_t ticks = Clock_getTicks();
-  tp->tv_sec = ticks / 1000;
-  tp->tv_usec = (ticks % 1000) * 1000;
-  return 0;
+bool mg_aton(struct mg_str str, struct mg_addr *addr) {
+  // LOG(LL_INFO, ("[%.*s]", (int) str.len, str.ptr));
+  return mg_atone(str, addr) || mg_atonl(str, addr) || mg_aton4(str, addr) ||
+         mg_aton6(str, addr);
 }
 
-#endif /* CS_PLATFORM == CS_P_MSP432 */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/nrf5/nrf5_libc.c"
+void mg_mgr_free(struct mg_mgr *mgr) {
+  struct mg_connection *c;
+  for (c = mgr->conns; c != NULL; c = c->next) c->is_closing = 1;
+  mg_mgr_poll(mgr, 0);
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+  FreeRTOS_DeleteSocketSet(mgr->ss);
+#endif
+  LOG(LL_INFO, ("All connections closed"));
+}
+
+void mg_mgr_init(struct mg_mgr *mgr) {
+  memset(mgr, 0, sizeof(*mgr));
+#if defined(_WIN32) && MG_ENABLE_WINSOCK
+  // clang-format off
+  { WSADATA data; WSAStartup(MAKEWORD(2, 2), &data); }
+  // clang-format on
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+  mgr->ss = FreeRTOS_CreateSocketSet();
+#elif defined(__unix) || defined(__unix__) || defined(__APPLE__)
+  // Ignore SIGPIPE signal, so if client cancels the request, it
+  // won't kill the whole process.
+  signal(SIGPIPE, SIG_IGN);
 #endif
-
-#if (CS_PLATFORM == CS_P_NRF51 || CS_PLATFORM == CS_P_NRF52) && \
-    defined(__ARMCC_VERSION)
-int gettimeofday(struct timeval *tp, void *tzp) {
-  /* TODO */
-  tp->tv_sec = 0;
-  tp->tv_usec = 0;
-  return 0;
+  mgr->dnstimeout = 3000;
+  mgr->dns4.url = "udp://8.8.8.8:53";
+  mgr->dns6.url = "udp://[2001:4860:4860::8888]:53";
 }
-#endif
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/simplelink/sl_fs_slfs.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_SIMPLELINK_SL_FS_SLFS_H_
-#define CS_COMMON_PLATFORMS_SIMPLELINK_SL_FS_SLFS_H_
-
-#if defined(MG_FS_SLFS)
-
-#include <stdio.h>
-#ifndef __TI_COMPILER_VERSION__
-#include <unistd.h>
-#include <sys/stat.h>
-#endif
-
-#define MAX_OPEN_SLFS_FILES 8
 
-/* Indirect libc interface - same functions, different names. */
-int fs_slfs_open(const char *pathname, int flags, mode_t mode);
-int fs_slfs_close(int fd);
-ssize_t fs_slfs_read(int fd, void *buf, size_t count);
-ssize_t fs_slfs_write(int fd, const void *buf, size_t count);
-int fs_slfs_stat(const char *pathname, struct stat *s);
-int fs_slfs_fstat(int fd, struct stat *s);
-off_t fs_slfs_lseek(int fd, off_t offset, int whence);
-int fs_slfs_unlink(const char *filename);
-int fs_slfs_rename(const char *from, const char *to);
-
-void fs_slfs_set_file_size(const char *name, size_t size);
-void fs_slfs_set_file_flags(const char *name, uint32_t flags, uint32_t *token);
-void fs_slfs_unset_file_flags(const char *name);
-
-#endif /* defined(MG_FS_SLFS) */
-
-#endif /* CS_COMMON_PLATFORMS_SIMPLELINK_SL_FS_SLFS_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/simplelink/sl_fs_slfs.c"
-#endif
-
-/* Standard libc interface to TI SimpleLink FS. */
-
-#if defined(MG_FS_SLFS) || defined(CC3200_FS_SLFS)
-
-/* Amalgamated: #include "common/platforms/simplelink/sl_fs_slfs.h" */
-
-#include <errno.h>
-
-#if CS_PLATFORM == CS_P_CC3200
-#include <inc/hw_types.h>
-#endif
-
-/* Amalgamated: #include "common/cs_dbg.h" */
-/* Amalgamated: #include "common/mg_mem.h" */
-
-#if SL_MAJOR_VERSION_NUM < 2
-int slfs_open(const unsigned char *fname, uint32_t flags, uint32_t *token) {
-  _i32 fh;
-  _i32 r = sl_FsOpen(fname, flags, (unsigned long *) token, &fh);
-  return (r < 0 ? r : fh);
-}
-#else /* SL_MAJOR_VERSION_NUM >= 2 */
-int slfs_open(const unsigned char *fname, uint32_t flags, uint32_t *token) {
-  return sl_FsOpen(fname, flags, (unsigned long *) token);
-}
+#ifdef MG_ENABLE_LINES
+#line 1 "src/sha1.c"
 #endif
+/* Copyright(c) By Steve Reid <steve@edmweb.com> */
+/* 100% Public Domain */
 
-/* From sl_fs.c */
-int set_errno(int e);
-const char *drop_dir(const char *fname, bool *is_slfs);
+#include <string.h>
 
 /*
- * With SLFS, you have to pre-declare max file size. Yes. Really.
- * 64K should be enough for everyone. Right?
+ * clang with std=-c99 uses __LITTLE_ENDIAN, by default
+ * while for ex, RTOS gcc - LITTLE_ENDIAN, by default
+ * it depends on __USE_BSD, but let's have everything
  */
-#ifndef FS_SLFS_MAX_FILE_SIZE
-#define FS_SLFS_MAX_FILE_SIZE (64 * 1024)
-#endif
+#if !defined(BYTE_ORDER) && defined(__BYTE_ORDER)
+#define BYTE_ORDER __BYTE_ORDER
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#endif /* LITTLE_ENDIAN */
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN __LITTLE_ENDIAN
+#endif /* BIG_ENDIAN */
+#endif /* BYTE_ORDER */
 
-struct sl_file_open_info {
-  char *name;
-  size_t size;
-  uint32_t flags;
-  uint32_t *token;
+union char64long16 {
+  unsigned char c[64];
+  uint32_t l[16];
 };
 
-struct sl_fd_info {
-  _i32 fh;
-  _off_t pos;
-  size_t size;
-};
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
 
-static struct sl_fd_info s_sl_fds[MAX_OPEN_SLFS_FILES];
-static struct sl_file_open_info s_sl_file_open_infos[MAX_OPEN_SLFS_FILES];
-
-static struct sl_file_open_info *fs_slfs_find_foi(const char *name,
-                                                  bool create);
-
-static int sl_fs_to_errno(_i32 r) {
-  DBG(("SL error: %d", (int) r));
-  switch (r) {
-    case SL_FS_OK:
-      return 0;
-    case SL_ERROR_FS_FILE_NAME_EXIST:
-      return EEXIST;
-    case SL_ERROR_FS_WRONG_FILE_NAME:
-      return EINVAL;
-    case SL_ERROR_FS_NO_AVAILABLE_NV_INDEX:
-    case SL_ERROR_FS_NOT_ENOUGH_STORAGE_SPACE:
-      return ENOSPC;
-    case SL_ERROR_FS_FAILED_TO_ALLOCATE_MEM:
-      return ENOMEM;
-    case SL_ERROR_FS_FILE_NOT_EXISTS:
-      return ENOENT;
-    case SL_ERROR_FS_NOT_SUPPORTED:
-      return ENOTSUP;
-  }
-  return ENXIO;
-}
-
-int fs_slfs_open(const char *pathname, int flags, mode_t mode) {
-  int fd;
-  for (fd = 0; fd < MAX_OPEN_SLFS_FILES; fd++) {
-    if (s_sl_fds[fd].fh <= 0) break;
-  }
-  if (fd >= MAX_OPEN_SLFS_FILES) return set_errno(ENOMEM);
-  struct sl_fd_info *fi = &s_sl_fds[fd];
-
-  /*
-   * Apply path manipulations again, in case we got here directly
-   * (via TI libc's "add_device").
-   */
-  pathname = drop_dir(pathname, NULL);
-
-  _u32 am = 0;
-  fi->size = (size_t) -1;
-  int rw = (flags & 3);
-  size_t new_size = 0;
-  struct sl_file_open_info *foi =
-      fs_slfs_find_foi(pathname, false /* create */);
-  if (foi != NULL) {
-    LOG(LL_DEBUG, ("FOI for %s: %d 0x%x %p", pathname, (int) foi->size,
-                   (unsigned int) foi->flags, foi->token));
-  }
-  if (rw == O_RDONLY) {
-    SlFsFileInfo_t sl_fi;
-    _i32 r = sl_FsGetInfo((const _u8 *) pathname, 0, &sl_fi);
-    if (r == SL_FS_OK) {
-      fi->size = SL_FI_FILE_SIZE(sl_fi);
-    }
-    am = SL_FS_READ;
-  } else {
-    if (!(flags & O_TRUNC) || (flags & O_APPEND)) {
-      // FailFS files cannot be opened for append and will be truncated
-      // when opened for write.
-      return set_errno(ENOTSUP);
-    }
-    if (flags & O_CREAT) {
-      if (foi->size > 0) {
-        new_size = foi->size;
-      } else {
-        new_size = FS_SLFS_MAX_FILE_SIZE;
-      }
-      am = FS_MODE_OPEN_CREATE(new_size, 0);
-    } else {
-      am = SL_FS_WRITE;
-    }
-#if SL_MAJOR_VERSION_NUM >= 2
-    am |= SL_FS_OVERWRITE;
+static uint32_t blk0(union char64long16 *block, int i) {
+/* Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN */
+#if BYTE_ORDER == LITTLE_ENDIAN
+  block->l[i] =
+      (rol(block->l[i], 24) & 0xFF00FF00) | (rol(block->l[i], 8) & 0x00FF00FF);
 #endif
-  }
-  uint32_t *token = NULL;
-  if (foi != NULL) {
-    am |= foi->flags;
-    token = foi->token;
-  }
-  fi->fh = slfs_open((_u8 *) pathname, am, token);
-  LOG(LL_DEBUG, ("sl_FsOpen(%s, 0x%x, %p) sz %u = %d", pathname, (int) am,
-                 token, (unsigned int) new_size, (int) fi->fh));
-  int r;
-  if (fi->fh >= 0) {
-    fi->pos = 0;
-    r = fd;
-  } else {
-    r = set_errno(sl_fs_to_errno(fi->fh));
-  }
-  return r;
+  return block->l[i];
 }
 
-int fs_slfs_close(int fd) {
-  struct sl_fd_info *fi = &s_sl_fds[fd];
-  if (fi->fh <= 0) return set_errno(EBADF);
-  _i32 r = sl_FsClose(fi->fh, NULL, NULL, 0);
-  LOG(LL_DEBUG, ("sl_FsClose(%d) = %d", (int) fi->fh, (int) r));
-  s_sl_fds[fd].fh = -1;
-  return set_errno(sl_fs_to_errno(r));
-}
-
-ssize_t fs_slfs_read(int fd, void *buf, size_t count) {
-  struct sl_fd_info *fi = &s_sl_fds[fd];
-  if (fi->fh <= 0) return set_errno(EBADF);
-  /* Simulate EOF. sl_FsRead @ file_size return SL_FS_ERR_OFFSET_OUT_OF_RANGE.
-   */
-  if (fi->pos == fi->size) return 0;
-  _i32 r = sl_FsRead(fi->fh, fi->pos, buf, count);
-  DBG(("sl_FsRead(%d, %d, %d) = %d", (int) fi->fh, (int) fi->pos, (int) count,
-       (int) r));
-  if (r >= 0) {
-    fi->pos += r;
-    return r;
-  }
-  return set_errno(sl_fs_to_errno(r));
-}
-
-ssize_t fs_slfs_write(int fd, const void *buf, size_t count) {
-  struct sl_fd_info *fi = &s_sl_fds[fd];
-  if (fi->fh <= 0) return set_errno(EBADF);
-  _i32 r = sl_FsWrite(fi->fh, fi->pos, (_u8 *) buf, count);
-  DBG(("sl_FsWrite(%d, %d, %d) = %d", (int) fi->fh, (int) fi->pos, (int) count,
-       (int) r));
-  if (r >= 0) {
-    fi->pos += r;
-    return r;
-  }
-  return set_errno(sl_fs_to_errno(r));
-}
-
-int fs_slfs_stat(const char *pathname, struct stat *s) {
-  SlFsFileInfo_t sl_fi;
-  /*
-   * Apply path manipulations again, in case we got here directly
-   * (via TI libc's "add_device").
-   */
-  pathname = drop_dir(pathname, NULL);
-  _i32 r = sl_FsGetInfo((const _u8 *) pathname, 0, &sl_fi);
-  if (r == SL_FS_OK) {
-    s->st_mode = S_IFREG | 0666;
-    s->st_nlink = 1;
-    s->st_size = SL_FI_FILE_SIZE(sl_fi);
-    return 0;
-  }
-  return set_errno(sl_fs_to_errno(r));
-}
+/* Avoid redefine warning (ARM /usr/include/sys/ucontext.h define R0~R4) */
+#undef blk
+#undef R0
+#undef R1
+#undef R2
+#undef R3
+#undef R4
 
-int fs_slfs_fstat(int fd, struct stat *s) {
-  struct sl_fd_info *fi = &s_sl_fds[fd];
-  if (fi->fh <= 0) return set_errno(EBADF);
-  s->st_mode = 0666;
-  s->st_mode = S_IFREG | 0666;
-  s->st_nlink = 1;
-  s->st_size = fi->size;
-  return 0;
+#define blk(i)                                                               \
+  (block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ block->l[(i + 8) & 15] ^ \
+                              block->l[(i + 2) & 15] ^ block->l[i & 15],     \
+                          1))
+#define R0(v, w, x, y, z, i)                                          \
+  z += ((w & (x ^ y)) ^ y) + blk0(block, i) + 0x5A827999 + rol(v, 5); \
+  w = rol(w, 30);
+#define R1(v, w, x, y, z, i)                                  \
+  z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
+  w = rol(w, 30);
+#define R2(v, w, x, y, z, i)                          \
+  z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
+  w = rol(w, 30);
+#define R3(v, w, x, y, z, i)                                        \
+  z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
+  w = rol(w, 30);
+#define R4(v, w, x, y, z, i)                          \
+  z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
+  w = rol(w, 30);
+
+static void mg_sha1_transform(uint32_t state[5], const unsigned char buffer[64]) {
+  uint32_t a, b, c, d, e;
+  union char64long16 block[1];
+
+  memcpy(block, buffer, 64);
+  a = state[0];
+  b = state[1];
+  c = state[2];
+  d = state[3];
+  e = state[4];
+  R0(a, b, c, d, e, 0);
+  R0(e, a, b, c, d, 1);
+  R0(d, e, a, b, c, 2);
+  R0(c, d, e, a, b, 3);
+  R0(b, c, d, e, a, 4);
+  R0(a, b, c, d, e, 5);
+  R0(e, a, b, c, d, 6);
+  R0(d, e, a, b, c, 7);
+  R0(c, d, e, a, b, 8);
+  R0(b, c, d, e, a, 9);
+  R0(a, b, c, d, e, 10);
+  R0(e, a, b, c, d, 11);
+  R0(d, e, a, b, c, 12);
+  R0(c, d, e, a, b, 13);
+  R0(b, c, d, e, a, 14);
+  R0(a, b, c, d, e, 15);
+  R1(e, a, b, c, d, 16);
+  R1(d, e, a, b, c, 17);
+  R1(c, d, e, a, b, 18);
+  R1(b, c, d, e, a, 19);
+  R2(a, b, c, d, e, 20);
+  R2(e, a, b, c, d, 21);
+  R2(d, e, a, b, c, 22);
+  R2(c, d, e, a, b, 23);
+  R2(b, c, d, e, a, 24);
+  R2(a, b, c, d, e, 25);
+  R2(e, a, b, c, d, 26);
+  R2(d, e, a, b, c, 27);
+  R2(c, d, e, a, b, 28);
+  R2(b, c, d, e, a, 29);
+  R2(a, b, c, d, e, 30);
+  R2(e, a, b, c, d, 31);
+  R2(d, e, a, b, c, 32);
+  R2(c, d, e, a, b, 33);
+  R2(b, c, d, e, a, 34);
+  R2(a, b, c, d, e, 35);
+  R2(e, a, b, c, d, 36);
+  R2(d, e, a, b, c, 37);
+  R2(c, d, e, a, b, 38);
+  R2(b, c, d, e, a, 39);
+  R3(a, b, c, d, e, 40);
+  R3(e, a, b, c, d, 41);
+  R3(d, e, a, b, c, 42);
+  R3(c, d, e, a, b, 43);
+  R3(b, c, d, e, a, 44);
+  R3(a, b, c, d, e, 45);
+  R3(e, a, b, c, d, 46);
+  R3(d, e, a, b, c, 47);
+  R3(c, d, e, a, b, 48);
+  R3(b, c, d, e, a, 49);
+  R3(a, b, c, d, e, 50);
+  R3(e, a, b, c, d, 51);
+  R3(d, e, a, b, c, 52);
+  R3(c, d, e, a, b, 53);
+  R3(b, c, d, e, a, 54);
+  R3(a, b, c, d, e, 55);
+  R3(e, a, b, c, d, 56);
+  R3(d, e, a, b, c, 57);
+  R3(c, d, e, a, b, 58);
+  R3(b, c, d, e, a, 59);
+  R4(a, b, c, d, e, 60);
+  R4(e, a, b, c, d, 61);
+  R4(d, e, a, b, c, 62);
+  R4(c, d, e, a, b, 63);
+  R4(b, c, d, e, a, 64);
+  R4(a, b, c, d, e, 65);
+  R4(e, a, b, c, d, 66);
+  R4(d, e, a, b, c, 67);
+  R4(c, d, e, a, b, 68);
+  R4(b, c, d, e, a, 69);
+  R4(a, b, c, d, e, 70);
+  R4(e, a, b, c, d, 71);
+  R4(d, e, a, b, c, 72);
+  R4(c, d, e, a, b, 73);
+  R4(b, c, d, e, a, 74);
+  R4(a, b, c, d, e, 75);
+  R4(e, a, b, c, d, 76);
+  R4(d, e, a, b, c, 77);
+  R4(c, d, e, a, b, 78);
+  R4(b, c, d, e, a, 79);
+  state[0] += a;
+  state[1] += b;
+  state[2] += c;
+  state[3] += d;
+  state[4] += e;
+  /* Erase working structures. The order of operations is important,
+   * used to ensure that compiler doesn't optimize those out. */
+  memset(block, 0, sizeof(block));
+  a = b = c = d = e = 0;
+  (void) a;
+  (void) b;
+  (void) c;
+  (void) d;
+  (void) e;
 }
 
-off_t fs_slfs_lseek(int fd, off_t offset, int whence) {
-  if (s_sl_fds[fd].fh <= 0) return set_errno(EBADF);
-  switch (whence) {
-    case SEEK_SET:
-      s_sl_fds[fd].pos = offset;
-      break;
-    case SEEK_CUR:
-      s_sl_fds[fd].pos += offset;
-      break;
-    case SEEK_END:
-      return set_errno(ENOTSUP);
-  }
-  return 0;
+void mg_sha1_init(mg_sha1_ctx *context) {
+  context->state[0] = 0x67452301;
+  context->state[1] = 0xEFCDAB89;
+  context->state[2] = 0x98BADCFE;
+  context->state[3] = 0x10325476;
+  context->state[4] = 0xC3D2E1F0;
+  context->count[0] = context->count[1] = 0;
 }
 
-int fs_slfs_unlink(const char *pathname) {
-  /*
-   * Apply path manipulations again, in case we got here directly
-   * (via TI libc's "add_device").
-   */
-  pathname = drop_dir(pathname, NULL);
-  return set_errno(sl_fs_to_errno(sl_FsDel((const _u8 *) pathname, 0)));
+void mg_sha1_update(mg_sha1_ctx *context, const unsigned char *data,
+                    size_t len) {
+  size_t i, j;
+
+  j = context->count[0];
+  if ((context->count[0] += (uint32_t) len << 3) < j) context->count[1]++;
+  context->count[1] += (uint32_t)(len >> 29);
+  j = (j >> 3) & 63;
+  if ((j + len) > 63) {
+    memcpy(&context->buffer[j], data, (i = 64 - j));
+    mg_sha1_transform(context->state, context->buffer);
+    for (; i + 63 < len; i += 64) {
+      mg_sha1_transform(context->state, &data[i]);
+    }
+    j = 0;
+  } else
+    i = 0;
+  memcpy(&context->buffer[j], &data[i], len - i);
 }
 
-int fs_slfs_rename(const char *from, const char *to) {
-  return set_errno(ENOTSUP);
-}
+void mg_sha1_final(unsigned char digest[20], mg_sha1_ctx *context) {
+  unsigned i;
+  unsigned char finalcount[8], c;
 
-static struct sl_file_open_info *fs_slfs_find_foi(const char *name,
-                                                  bool create) {
-  int i = 0;
-  for (i = 0; i < MAX_OPEN_SLFS_FILES; i++) {
-    if (s_sl_file_open_infos[i].name != NULL &&
-        strcmp(drop_dir(s_sl_file_open_infos[i].name, NULL), name) == 0) {
-      break;
-    }
-  }
-  if (i != MAX_OPEN_SLFS_FILES) return &s_sl_file_open_infos[i];
-  if (!create) return NULL;
-  for (i = 0; i < MAX_OPEN_SLFS_FILES; i++) {
-    if (s_sl_file_open_infos[i].name == NULL) break;
+  for (i = 0; i < 8; i++) {
+    finalcount[i] = (unsigned char) ((context->count[(i >= 4 ? 0 : 1)] >>
+                                      ((3 - (i & 3)) * 8)) &
+                                     255);
   }
-  if (i == MAX_OPEN_SLFS_FILES) {
-    i = 0; /* Evict a random slot. */
+  c = 0200;
+  mg_sha1_update(context, &c, 1);
+  while ((context->count[0] & 504) != 448) {
+    c = 0000;
+    mg_sha1_update(context, &c, 1);
   }
-  if (s_sl_file_open_infos[i].name != NULL) {
-    free(s_sl_file_open_infos[i].name);
+  mg_sha1_update(context, finalcount, 8);
+  for (i = 0; i < 20; i++) {
+    digest[i] =
+        (unsigned char) ((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
   }
-  s_sl_file_open_infos[i].name = strdup(name);
-  return &s_sl_file_open_infos[i];
+  memset(context, '\0', sizeof(*context));
+  memset(&finalcount, '\0', sizeof(finalcount));
 }
 
-void fs_slfs_set_file_size(const char *name, size_t size) {
-  struct sl_file_open_info *foi = fs_slfs_find_foi(name, true /* create */);
-  foi->size = size;
-}
+void mg_hmac_sha1(const unsigned char *key, size_t keylen,
+                  const unsigned char *data, size_t datalen,
+                  unsigned char out[20]) {
+  mg_sha1_ctx ctx;
+  unsigned char buf1[64], buf2[64], tmp_key[20], i;
 
-void fs_slfs_set_file_flags(const char *name, uint32_t flags, uint32_t *token) {
-  struct sl_file_open_info *foi = fs_slfs_find_foi(name, true /* create */);
-  foi->flags = flags;
-  foi->token = token;
-}
+  if (keylen > sizeof(buf1)) {
+    mg_sha1_init(&ctx);
+    mg_sha1_update(&ctx, key, keylen);
+    mg_sha1_final(tmp_key, &ctx);
+    key = tmp_key;
+    keylen = sizeof(tmp_key);
+  }
 
-void fs_slfs_unset_file_flags(const char *name) {
-  struct sl_file_open_info *foi = fs_slfs_find_foi(name, false /* create */);
-  if (foi == NULL) return;
-  free(foi->name);
-  memset(foi, 0, sizeof(*foi));
-}
+  memset(buf1, 0, sizeof(buf1));
+  memset(buf2, 0, sizeof(buf2));
+  memcpy(buf1, key, keylen);
+  memcpy(buf2, key, keylen);
 
-#endif /* defined(MG_FS_SLFS) || defined(CC3200_FS_SLFS) */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/simplelink/sl_fs.c"
-#endif
+  for (i = 0; i < sizeof(buf1); i++) {
+    buf1[i] ^= 0x36;
+    buf2[i] ^= 0x5c;
+  }
 
-#if MG_NET_IF == MG_NET_IF_SIMPLELINK && \
-    (defined(MG_FS_SLFS) || defined(MG_FS_SPIFFS))
+  mg_sha1_init(&ctx);
+  mg_sha1_update(&ctx, buf1, sizeof(buf1));
+  mg_sha1_update(&ctx, data, datalen);
+  mg_sha1_final(out, &ctx);
 
-int set_errno(int e) {
-  errno = e;
-  return (e == 0 ? 0 : -1);
+  mg_sha1_init(&ctx);
+  mg_sha1_update(&ctx, buf2, sizeof(buf2));
+  mg_sha1_update(&ctx, out, 20);
+  mg_sha1_final(out, &ctx);
 }
 
-const char *drop_dir(const char *fname, bool *is_slfs) {
-  if (is_slfs != NULL) {
-    *is_slfs = (strncmp(fname, "SL:", 3) == 0);
-    if (*is_slfs) fname += 3;
-  }
-  /* Drop "./", if any */
-  if (fname[0] == '.' && fname[1] == '/') {
-    fname += 2;
-  }
-  /*
-   * Drop / if it is the only one in the path.
-   * This allows use of /pretend/directories but serves /file.txt as normal.
-   */
-  if (fname[0] == '/' && strchr(fname + 1, '/') == NULL) {
-    fname++;
-  }
-  return fname;
-}
+#ifdef MG_ENABLE_LINES
+#line 1 "src/sntp.c"
+#endif
 
-#if !defined(MG_FS_NO_VFS)
 
-#include <errno.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#ifdef __TI_COMPILER_VERSION__
-#include <file.h>
-#endif
 
-/* Amalgamated: #include "common/cs_dbg.h" */
-/* Amalgamated: #include "common/platform.h" */
 
-#ifdef CC3200_FS_SPIFFS
-/* Amalgamated: #include "cc3200_fs_spiffs.h" */
-#endif
 
-#ifdef MG_FS_SLFS
-/* Amalgamated: #include "sl_fs_slfs.h" */
-#endif
 
-#define NUM_SYS_FDS 3
-#define SPIFFS_FD_BASE 10
-#define SLFS_FD_BASE 100
-
-#if !defined(MG_UART_CHAR_PUT) && !defined(MG_UART_WRITE)
-#if CS_PLATFORM == CS_P_CC3200
-#include <inc/hw_types.h>
-#include <inc/hw_memmap.h>
-#include <driverlib/rom.h>
-#include <driverlib/rom_map.h>
-#include <driverlib/uart.h>
-#define MG_UART_CHAR_PUT(fd, c) MAP_UARTCharPut(UARTA0_BASE, c);
-#else
-#define MG_UART_WRITE(fd, buf, len)
-#endif /* CS_PLATFORM == CS_P_CC3200 */
-#endif /* !MG_UART_CHAR_PUT */
-
-enum fd_type {
-  FD_INVALID,
-  FD_SYS,
-#ifdef CC3200_FS_SPIFFS
-  FD_SPIFFS,
-#endif
-#ifdef MG_FS_SLFS
-  FD_SLFS
-#endif
-};
-static int fd_type(int fd) {
-  if (fd >= 0 && fd < NUM_SYS_FDS) return FD_SYS;
-#ifdef CC3200_FS_SPIFFS
-  if (fd >= SPIFFS_FD_BASE && fd < SPIFFS_FD_BASE + MAX_OPEN_SPIFFS_FILES) {
-    return FD_SPIFFS;
-  }
-#endif
-#ifdef MG_FS_SLFS
-  if (fd >= SLFS_FD_BASE && fd < SLFS_FD_BASE + MAX_OPEN_SLFS_FILES) {
-    return FD_SLFS;
-  }
-#endif
-  return FD_INVALID;
-}
+#define SNTP_INTERVAL_SEC 3600
+#define SNTP_TIME_OFFSET 2208988800UL
 
-#if MG_TI_NO_HOST_INTERFACE
-int open(const char *pathname, unsigned flags, int mode) {
-#else
-int _open(const char *pathname, int flags, mode_t mode) {
-#endif
-  int fd = -1;
-  bool is_sl;
-  const char *fname = drop_dir(pathname, &is_sl);
-  if (is_sl) {
-#ifdef MG_FS_SLFS
-    fd = fs_slfs_open(fname, flags, mode);
-    if (fd >= 0) fd += SLFS_FD_BASE;
-#endif
-  } else {
-#ifdef CC3200_FS_SPIFFS
-    fd = fs_spiffs_open(fname, flags, mode);
-    if (fd >= 0) fd += SPIFFS_FD_BASE;
-#endif
-  }
-  LOG(LL_DEBUG,
-      ("open(%s, 0x%x) = %d, fname = %s", pathname, flags, fd, fname));
-  return fd;
-}
+static unsigned long s_sntmp_next;
 
-int _stat(const char *pathname, struct stat *st) {
-  int res = -1;
-  bool is_sl;
-  const char *fname = drop_dir(pathname, &is_sl);
-  memset(st, 0, sizeof(*st));
-  /* Simulate statting the root directory. */
-  if (fname[0] == '\0' || strcmp(fname, ".") == 0) {
-    st->st_ino = 0;
-    st->st_mode = S_IFDIR | 0777;
-    st->st_nlink = 1;
-    st->st_size = 0;
-    return 0;
-  }
-  if (is_sl) {
-#ifdef MG_FS_SLFS
-    res = fs_slfs_stat(fname, st);
-#endif
+int64_t mg_sntp_parse(const unsigned char *buf, size_t len) {
+  int64_t res = -1;
+  int mode = len > 0 ? buf[0] & 7 : 0;
+  if (len < 48) {
+    LOG(LL_ERROR, ("%s", "corrupt packet"));
+  } else if ((buf[0] & 0x38) >> 3 != 4) {
+    LOG(LL_ERROR, ("%s", "wrong version"));
+  } else if (mode != 4 && mode != 5) {
+    LOG(LL_ERROR, ("%s", "not a server reply"));
+  } else if (buf[1] == 0) {
+    LOG(LL_ERROR, ("%s", "server sent a kiss of death"));
   } else {
-#ifdef CC3200_FS_SPIFFS
-    res = fs_spiffs_stat(fname, st);
-#endif
+    uint32_t *data = (uint32_t *) &buf[40];
+    unsigned long seconds = mg_ntohl(data[0]) - SNTP_TIME_OFFSET;
+    unsigned long useconds = mg_ntohl(data[1]);
+    // LOG(LL_DEBUG, ("%lu %lu %lu", time(0), seconds, useconds));
+    res = ((int64_t) seconds) * 1000 + (int64_t) ((useconds / 1000) % 1000);
+    s_sntmp_next = seconds + SNTP_INTERVAL_SEC;
   }
-  LOG(LL_DEBUG, ("stat(%s) = %d; fname = %s", pathname, res, fname));
   return res;
 }
 
-#if MG_TI_NO_HOST_INTERFACE
-int close(int fd) {
-#else
-int _close(int fd) {
-#endif
-  int r = -1;
-  switch (fd_type(fd)) {
-    case FD_INVALID:
-      r = set_errno(EBADF);
-      break;
-    case FD_SYS:
-      r = set_errno(EACCES);
-      break;
-#ifdef CC3200_FS_SPIFFS
-    case FD_SPIFFS:
-      r = fs_spiffs_close(fd - SPIFFS_FD_BASE);
-      break;
-#endif
-#ifdef MG_FS_SLFS
-    case FD_SLFS:
-      r = fs_slfs_close(fd - SLFS_FD_BASE);
-      break;
-#endif
+static void sntp_cb(struct mg_connection *c, int ev, void *evd, void *fnd) {
+  if (ev == MG_EV_READ) {
+    int64_t milliseconds = mg_sntp_parse(c->recv.buf, c->recv.len);
+    if (milliseconds > 0) {
+      mg_call(c, MG_EV_SNTP_TIME, &milliseconds);
+      LOG(LL_DEBUG, ("%u.%u, next at %lu", (unsigned) (milliseconds / 1000),
+                     (unsigned) (milliseconds % 1000), s_sntmp_next));
+    }
+    c->recv.len = 0;  // Clear receive buffer
+  } else if (ev == MG_EV_CONNECT) {
+    mg_sntp_send(c, (unsigned long) time(NULL));
+  } else if (ev == MG_EV_CLOSE) {
   }
-  DBG(("close(%d) = %d", fd, r));
-  return r;
+  (void) fnd;
+  (void) evd;
 }
 
-#if MG_TI_NO_HOST_INTERFACE
-off_t lseek(int fd, off_t offset, int whence) {
-#else
-off_t _lseek(int fd, off_t offset, int whence) {
-#endif
-  int r = -1;
-  switch (fd_type(fd)) {
-    case FD_INVALID:
-      r = set_errno(EBADF);
-      break;
-    case FD_SYS:
-      r = set_errno(ESPIPE);
-      break;
-#ifdef CC3200_FS_SPIFFS
-    case FD_SPIFFS:
-      r = fs_spiffs_lseek(fd - SPIFFS_FD_BASE, offset, whence);
-      break;
-#endif
-#ifdef MG_FS_SLFS
-    case FD_SLFS:
-      r = fs_slfs_lseek(fd - SLFS_FD_BASE, offset, whence);
-      break;
-#endif
+void mg_sntp_send(struct mg_connection *c, unsigned long utc) {
+  if (c->is_resolving) {
+    LOG(LL_ERROR, ("%lu wait until resolved", c->id));
+  } else if (utc > s_sntmp_next) {
+    uint8_t buf[48] = {0};
+    s_sntmp_next = utc + SNTP_INTERVAL_SEC;
+    buf[0] = (0 << 6) | (4 << 3) | 3;
+    mg_send(c, buf, sizeof(buf));
+    LOG(LL_DEBUG, ("%lu ct %lu, next at %lu", c->id, utc, s_sntmp_next));
   }
-  DBG(("lseek(%d, %d, %d) = %d", fd, (int) offset, whence, r));
-  return r;
 }
 
-int _fstat(int fd, struct stat *s) {
-  int r = -1;
-  memset(s, 0, sizeof(*s));
-  switch (fd_type(fd)) {
-    case FD_INVALID:
-      r = set_errno(EBADF);
-      break;
-    case FD_SYS: {
-      /* Create barely passable stats for STD{IN,OUT,ERR}. */
-      memset(s, 0, sizeof(*s));
-      s->st_ino = fd;
-      s->st_mode = S_IFCHR | 0666;
-      r = 0;
-      break;
-    }
-#ifdef CC3200_FS_SPIFFS
-    case FD_SPIFFS:
-      r = fs_spiffs_fstat(fd - SPIFFS_FD_BASE, s);
-      break;
-#endif
-#ifdef MG_FS_SLFS
-    case FD_SLFS:
-      r = fs_slfs_fstat(fd - SLFS_FD_BASE, s);
-      break;
-#endif
-  }
-  DBG(("fstat(%d) = %d", fd, r));
-  return r;
+struct mg_connection *mg_sntp_connect(struct mg_mgr *mgr, const char *url,
+                                      mg_event_handler_t fn, void *fnd) {
+  struct mg_connection *c = NULL;
+  if (url == NULL) url = "udp://time.google.com:123";
+  if ((c = mg_connect(mgr, url, fn, fnd)) != NULL) c->pfn = sntp_cb;
+  return c;
 }
 
-#if MG_TI_NO_HOST_INTERFACE
-int read(int fd, char *buf, unsigned count) {
-#else
-ssize_t _read(int fd, void *buf, size_t count) {
-#endif
-  int r = -1;
-  switch (fd_type(fd)) {
-    case FD_INVALID:
-      r = set_errno(EBADF);
-      break;
-    case FD_SYS: {
-      if (fd != 0) {
-        r = set_errno(EACCES);
-        break;
-      }
-      /* Should we allow reading from stdin = uart? */
-      r = set_errno(ENOTSUP);
-      break;
-    }
-#ifdef CC3200_FS_SPIFFS
-    case FD_SPIFFS:
-      r = fs_spiffs_read(fd - SPIFFS_FD_BASE, buf, count);
-      break;
-#endif
-#ifdef MG_FS_SLFS
-    case FD_SLFS:
-      r = fs_slfs_read(fd - SLFS_FD_BASE, buf, count);
-      break;
+#ifdef MG_ENABLE_LINES
+#line 1 "src/sock.c"
 #endif
-  }
-  DBG(("read(%d, %u) = %d", fd, count, r));
-  return r;
-}
 
-#if MG_TI_NO_HOST_INTERFACE
-int write(int fd, const char *buf, unsigned count) {
-#else
-ssize_t _write(int fd, const void *buf, size_t count) {
-#endif
-  int r = -1;
-  switch (fd_type(fd)) {
-    case FD_INVALID:
-      r = set_errno(EBADF);
-      break;
-    case FD_SYS: {
-      if (fd == 0) {
-        r = set_errno(EACCES);
-        break;
-      }
-#ifdef MG_UART_WRITE
-      MG_UART_WRITE(fd, buf, count);
-#elif defined(MG_UART_CHAR_PUT)
-      {
-        size_t i;
-        for (i = 0; i < count; i++) {
-          const char c = ((const char *) buf)[i];
-          if (c == '\n') MG_UART_CHAR_PUT(fd, '\r');
-          MG_UART_CHAR_PUT(fd, c);
-        }
-      }
-#endif
-      r = count;
-      break;
-    }
-#ifdef CC3200_FS_SPIFFS
-    case FD_SPIFFS:
-      r = fs_spiffs_write(fd - SPIFFS_FD_BASE, buf, count);
-      break;
-#endif
-#ifdef MG_FS_SLFS
-    case FD_SLFS:
-      r = fs_slfs_write(fd - SLFS_FD_BASE, buf, count);
-      break;
-#endif
-  }
-  return r;
-}
 
-/*
- * On Newlib we override rename directly too, because the default
- * implementation using _link and _unlink doesn't work for us.
- */
-#if MG_TI_NO_HOST_INTERFACE || defined(_NEWLIB_VERSION)
-int rename(const char *frompath, const char *topath) {
-  int r = -1;
-  bool is_sl_from, is_sl_to;
-  const char *from = drop_dir(frompath, &is_sl_from);
-  const char *to = drop_dir(topath, &is_sl_to);
-  if (is_sl_from || is_sl_to) {
-    set_errno(ENOTSUP);
-  } else {
-#ifdef CC3200_FS_SPIFFS
-    r = fs_spiffs_rename(from, to);
-#endif
-  }
-  DBG(("rename(%s, %s) = %d", from, to, r));
-  return r;
-}
-#endif /* MG_TI_NO_HOST_INTERFACE || defined(_NEWLIB_VERSION) */
 
-#if MG_TI_NO_HOST_INTERFACE
-int unlink(const char *pathname) {
-#else
-int _unlink(const char *pathname) {
-#endif
-  int r = -1;
-  bool is_sl;
-  const char *fname = drop_dir(pathname, &is_sl);
-  if (is_sl) {
-#ifdef MG_FS_SLFS
-    r = fs_slfs_unlink(fname);
-#endif
-  } else {
-#ifdef CC3200_FS_SPIFFS
-    r = fs_spiffs_unlink(fname);
-#endif
-  }
-  DBG(("unlink(%s) = %d, fname = %s", pathname, r, fname));
-  return r;
-}
 
-#ifdef CC3200_FS_SPIFFS /* FailFS does not support listing files. */
-DIR *opendir(const char *dir_name) {
-  DIR *r = NULL;
-  bool is_sl;
-  drop_dir(dir_name, &is_sl);
-  if (is_sl) {
-    r = NULL;
-    set_errno(ENOTSUP);
-  } else {
-    r = fs_spiffs_opendir(dir_name);
-  }
-  DBG(("opendir(%s) = %p", dir_name, r));
-  return r;
-}
 
-struct dirent *readdir(DIR *dir) {
-  struct dirent *res = fs_spiffs_readdir(dir);
-  DBG(("readdir(%p) = %p", dir, res));
-  return res;
-}
 
-int closedir(DIR *dir) {
-  int res = fs_spiffs_closedir(dir);
-  DBG(("closedir(%p) = %d", dir, res));
-  return res;
-}
 
-int rmdir(const char *path) {
-  return fs_spiffs_rmdir(path);
-}
 
-int mkdir(const char *path, mode_t mode) {
-  (void) path;
-  (void) mode;
-  /* for spiffs supports only root dir, which comes from mongoose as '.' */
-  return (strlen(path) == 1 && *path == '.') ? 0 : ENOTDIR;
-}
-#endif
 
-int sl_fs_init(void) {
-  int ret = 1;
-#ifdef __TI_COMPILER_VERSION__
-#ifdef MG_FS_SLFS
-#pragma diag_push
-#pragma diag_suppress 169 /* Nothing we can do about the prototype mismatch. \
-                             */
-  ret = (add_device("SL", _MSA, fs_slfs_open, fs_slfs_close, fs_slfs_read,
-                    fs_slfs_write, fs_slfs_lseek, fs_slfs_unlink,
-                    fs_slfs_rename) == 0);
-#pragma diag_pop
+
+#if MG_ENABLE_SOCKET
+#if defined(_WIN32) && MG_ENABLE_WINSOCK
+#define MG_SOCK_ERRNO WSAGetLastError()
+#ifndef SO_EXCLUSIVEADDRUSE
+#define SO_EXCLUSIVEADDRUSE ((int) (~SO_REUSEADDR))
 #endif
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+#define MG_SOCK_ERRNO errno
+typedef Socket_t SOCKET;
+#define INVALID_SOCKET FREERTOS_INVALID_SOCKET
+#else
+#define MG_SOCK_ERRNO errno
+#ifndef closesocket
+#define closesocket(x) close(x)
 #endif
-  return ret;
-}
-
-#endif /* !defined(MG_FS_NO_VFS) */
-#endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK && (defined(MG_FS_SLFS) || \
-          defined(MG_FS_SPIFFS)) */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/simplelink/sl_socket.c"
+#define INVALID_SOCKET (-1)
+typedef int SOCKET;
 #endif
 
-#if MG_NET_IF == MG_NET_IF_SIMPLELINK
+#define FD(c_) ((SOCKET) (size_t) (c_)->fd)
+#define S2PTR(s_) ((void *) (size_t) (s_))
 
-#include <errno.h>
-#include <stdio.h>
+#ifndef MSG_NONBLOCKING
+#define MSG_NONBLOCKING 0
+#endif
 
-/* Amalgamated: #include "common/platform.h" */
+#ifndef AF_INET6
+#define AF_INET6 10
+#endif
 
-const char *inet_ntop(int af, const void *src, char *dst, socklen_t size) {
-  int res;
-  struct in_addr *in = (struct in_addr *) src;
-  if (af != AF_INET) {
-    errno = ENOTSUP;
-    return NULL;
-  }
-  res = snprintf(dst, size, "%lu.%lu.%lu.%lu", SL_IPV4_BYTE(in->s_addr, 0),
-                 SL_IPV4_BYTE(in->s_addr, 1), SL_IPV4_BYTE(in->s_addr, 2),
-                 SL_IPV4_BYTE(in->s_addr, 3));
-  return res > 0 ? dst : NULL;
-}
+union usa {
+  struct sockaddr sa;
+  struct sockaddr_in sin;
+#if MG_ENABLE_IPV6
+  struct sockaddr_in6 sin6;
+#endif
+};
 
-char *inet_ntoa(struct in_addr n) {
-  static char a[16];
-  return (char *) inet_ntop(AF_INET, &n, a, sizeof(a));
+static socklen_t tousa(struct mg_addr *a, union usa *usa) {
+  socklen_t len = sizeof(usa->sin);
+  memset(usa, 0, sizeof(*usa));
+  usa->sin.sin_family = AF_INET;
+  usa->sin.sin_port = a->port;
+  *(uint32_t *) &usa->sin.sin_addr = a->ip;
+#if MG_ENABLE_IPV6
+  if (a->is_ip6) {
+    usa->sin.sin_family = AF_INET6;
+    usa->sin6.sin6_port = a->port;
+    memcpy(&usa->sin6.sin6_addr, a->ip6, sizeof(a->ip6));
+    len = sizeof(usa->sin6);
+  }
+#endif
+  return len;
 }
 
-int inet_pton(int af, const char *src, void *dst) {
-  uint32_t a0, a1, a2, a3;
-  uint8_t *db = (uint8_t *) dst;
-  if (af != AF_INET) {
-    errno = ENOTSUP;
-    return 0;
-  }
-  if (sscanf(src, "%lu.%lu.%lu.%lu", &a0, &a1, &a2, &a3) != 4) {
-    return 0;
+static void tomgaddr(union usa *usa, struct mg_addr *a, bool is_ip6) {
+  a->is_ip6 = is_ip6;
+  a->port = usa->sin.sin_port;
+  memcpy(&a->ip, &usa->sin.sin_addr, sizeof(a->ip));
+#if MG_ENABLE_IPV6
+  if (is_ip6) {
+    memcpy(a->ip6, &usa->sin6.sin6_addr, sizeof(a->ip6));
+    a->port = usa->sin6.sin6_port;
   }
-  *db = a3;
-  *(db + 1) = a2;
-  *(db + 2) = a1;
-  *(db + 3) = a0;
-  return 1;
+#endif
 }
 
-#endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/simplelink/sl_mg_task.c"
+static bool mg_sock_would_block(void) {
+  int err = MG_SOCK_ERRNO;
+  return err == EINPROGRESS || err == EWOULDBLOCK
+#ifndef WINCE
+         || err == EAGAIN || err == EINTR
 #endif
-#if MG_NET_IF == MG_NET_IF_SIMPLELINK && !defined(MG_SIMPLELINK_NO_OSI)
-
-/* Amalgamated: #include "mg_task.h" */
-
-#include <oslib/osi.h>
-
-enum mg_q_msg_type {
-  MG_Q_MSG_CB,
-};
-struct mg_q_msg {
-  enum mg_q_msg_type type;
-  void (*cb)(struct mg_mgr *mgr, void *arg);
-  void *arg;
-};
-static OsiMsgQ_t s_mg_q;
-static void mg_task(void *arg);
+#if defined(_WIN32) && MG_ENABLE_WINSOCK
+         || err == WSAEINTR || err == WSAEWOULDBLOCK
+#endif
+      ;
+}
 
-bool mg_start_task(int priority, int stack_size, mg_init_cb mg_init) {
-  if (osi_MsgQCreate(&s_mg_q, "MG", sizeof(struct mg_q_msg), 16) != OSI_OK) {
-    return false;
-  }
-  if (osi_TaskCreate(mg_task, (const signed char *) "MG", stack_size,
-                     (void *) mg_init, priority, NULL) != OSI_OK) {
-    return false;
+static struct mg_connection *alloc_conn(struct mg_mgr *mgr, bool is_client,
+                                        SOCKET fd) {
+  struct mg_connection *c = (struct mg_connection *) calloc(1, sizeof(*c));
+  if (c != NULL) {
+    c->is_client = is_client;
+    c->fd = S2PTR(fd);
+    c->mgr = mgr;
+    c->id = ++mgr->nextid;
   }
-  return true;
+  return c;
 }
 
-static void mg_task(void *arg) {
-  struct mg_mgr mgr;
-  mg_init_cb mg_init = (mg_init_cb) arg;
-  mg_mgr_init(&mgr, NULL);
-  mg_init(&mgr);
-  while (1) {
-    struct mg_q_msg msg;
-    mg_mgr_poll(&mgr, 1);
-    if (osi_MsgQRead(&s_mg_q, &msg, 1) != OSI_OK) continue;
-    switch (msg.type) {
-      case MG_Q_MSG_CB: {
-        msg.cb(&mgr, msg.arg);
-      }
+static void iolog(struct mg_connection *c, char *buf, long n, bool r) {
+  LOG(n > 0 ? LL_VERBOSE_DEBUG : LL_DEBUG,
+      ("%-3lu %d%d%d%d%d%d%d%d%d%d%d%d%d%d %d:%d %ld err %d", c->id,
+       c->is_listening, c->is_client, c->is_accepted, c->is_resolving,
+       c->is_connecting, c->is_tls, c->is_tls_hs, c->is_udp, c->is_websocket,
+       c->is_hexdumping, c->is_draining, c->is_closing, c->is_readable,
+       c->is_writable, (int) c->send.len, (int) c->recv.len, n, MG_SOCK_ERRNO));
+  if (n == 0) {
+    // Do nothing
+  } else if (n < 0) {
+    c->is_closing = 1;  // Error, or normal termination
+  } else if (n > 0) {
+    if (c->is_hexdumping) {
+      union usa usa;
+      char t1[50] = "", t2[50] = "";
+      socklen_t slen = sizeof(usa.sin);
+      char *s = mg_hexdump(buf, (size_t) n);
+      struct mg_addr a;
+      memset(&usa, 0, sizeof(usa));
+      memset(&a, 0, sizeof(a));
+      getsockname(FD(c), &usa.sa, &slen);
+      tomgaddr(&usa, &a, c->peer.is_ip6);
+      LOG(LL_INFO, ("\n-- %lu %s %s %s %s %ld\n%s", c->id,
+                    mg_straddr(&a, t1, sizeof(t1)), r ? "<-" : "->",
+                    mg_straddr(&c->peer, t2, sizeof(t2)), c->label, n, s));
+      free(s);
+      (void) t1, (void) t2;  // Silence warnings for MG_ENABLE_LOG=0
+    }
+    if (r) {
+      struct mg_str evd = mg_str_n(buf, (size_t) n);
+      c->recv.len += (size_t) n;
+      mg_call(c, MG_EV_READ, &evd);
+    } else {
+      mg_iobuf_del(&c->send, 0, (size_t) n);
+      if (c->send.len == 0) mg_iobuf_resize(&c->send, 0);
+      mg_call(c, MG_EV_WRITE, &n);
     }
   }
 }
 
-void mg_run_in_task(void (*cb)(struct mg_mgr *mgr, void *arg), void *cb_arg) {
-  struct mg_q_msg msg = {MG_Q_MSG_CB, cb, cb_arg};
-  osi_MsgQWrite(&s_mg_q, &msg, OSI_NO_WAIT);
+static long mg_sock_send(struct mg_connection *c, const void *buf, size_t len) {
+  long n;
+  if (c->is_udp) {
+    union usa usa;
+    socklen_t slen = tousa(&c->peer, &usa);
+    n = sendto(FD(c), (char *) buf, len, 0, &usa.sa, slen);
+  } else {
+    n = send(FD(c), (char *) buf, len, MSG_NONBLOCKING);
+  }
+  return n == 0 ? -1 : n < 0 && mg_sock_would_block() ? 0 : n;
 }
 
-#endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK && !defined(MG_SIMPLELINK_NO_OSI) \
-          */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/simplelink/sl_net_if.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_SIMPLELINK_SL_NET_IF_H_
-#define CS_COMMON_PLATFORMS_SIMPLELINK_SL_NET_IF_H_
-
-/* Amalgamated: #include "mongoose/src/net_if.h" */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-#ifndef MG_ENABLE_NET_IF_SIMPLELINK
-#define MG_ENABLE_NET_IF_SIMPLELINK MG_NET_IF == MG_NET_IF_SIMPLELINK
-#endif
-
-extern const struct mg_iface_vtable mg_simplelink_iface_vtable;
-
-#ifdef __cplusplus
+bool mg_send(struct mg_connection *c, const void *buf, size_t len) {
+  if (c->is_udp) {
+    long n = mg_sock_send(c, buf, len);
+    iolog(c, (char *) buf, n, false);
+    return n > 0;
+  } else {
+    return mg_iobuf_add(&c->send, c->send.len, buf, len, MG_IO_SIZE);
+  }
 }
-#endif /* __cplusplus */
-
-#endif /* CS_COMMON_PLATFORMS_SIMPLELINK_SL_NET_IF_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/simplelink/sl_net_if.c"
-#endif
 
-/* Amalgamated: #include "common/platforms/simplelink/sl_net_if.h" */
-
-#if MG_ENABLE_NET_IF_SIMPLELINK
-
-/* Amalgamated: #include "mongoose/src/internal.h" */
-/* Amalgamated: #include "mongoose/src/util.h" */
-
-#define MG_TCP_RECV_BUFFER_SIZE 1024
-#define MG_UDP_RECV_BUFFER_SIZE 1500
-
-static sock_t mg_open_listening_socket(struct mg_connection *nc,
-                                       union socket_address *sa, int type,
-                                       int proto);
-
-static void mg_set_non_blocking_mode(sock_t sock) {
-  SlSockNonblocking_t opt;
-#if SL_MAJOR_VERSION_NUM < 2
-  opt.NonblockingEnabled = 1;
+static void mg_set_non_blocking_mode(SOCKET fd) {
+#if defined(_WIN32) && MG_ENABLE_WINSOCK
+  unsigned long on = 1;
+  ioctlsocket(fd, FIONBIO, &on);
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+  const BaseType_t off = 0;
+  setsockopt(fd, 0, FREERTOS_SO_RCVTIMEO, &off, sizeof(off));
+  setsockopt(fd, 0, FREERTOS_SO_SNDTIMEO, &off, sizeof(off));
+#elif MG_ARCH == MG_ARCH_FREERTOS_LWIP
+  lwip_fcntl(fd, F_SETFL, O_NONBLOCK);
+#elif MG_ARCH == MG_ARCH_AZURERTOS
+  fcntl(fd, F_SETFL, O_NONBLOCK);
 #else
-  opt.NonBlockingEnabled = 1;
+  fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);  // Non-blocking mode
+  fcntl(fd, F_SETFD, FD_CLOEXEC);                          // Set close-on-exec
 #endif
-  sl_SetSockOpt(sock, SL_SOL_SOCKET, SL_SO_NONBLOCKING, &opt, sizeof(opt));
-}
-
-static int mg_is_error(int n) {
-  return (n < 0 && n != SL_ERROR_BSD_EALREADY && n != SL_ERROR_BSD_EAGAIN);
 }
 
-static void mg_sl_if_connect_tcp(struct mg_connection *nc,
-                                 const union socket_address *sa) {
-  int proto = 0;
-#if MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_SIMPLELINK
-  if (nc->flags & MG_F_SSL) proto = SL_SEC_SOCKET;
+static SOCKET mg_open_listener(const char *url, struct mg_addr *addr) {
+  SOCKET fd = INVALID_SOCKET;
+  int s_err = 0;  // Memoized socket error, in case closesocket() overrides it
+  memset(addr, 0, sizeof(*addr));
+  addr->port = mg_htons(mg_url_port(url));
+  if (!mg_aton(mg_url_host(url), addr)) {
+    LOG(LL_ERROR, ("invalid listening URL: %s", url));
+  } else {
+    union usa usa;
+    socklen_t slen = tousa(addr, &usa);
+    int on = 1, af = addr->is_ip6 ? AF_INET6 : AF_INET;
+    int type = strncmp(url, "udp:", 4) == 0 ? SOCK_DGRAM : SOCK_STREAM;
+    int proto = type == SOCK_DGRAM ? IPPROTO_UDP : IPPROTO_TCP;
+    (void) on;
+
+    if ((fd = socket(af, type, proto)) != INVALID_SOCKET &&
+#if (!defined(_WIN32) || !defined(SO_EXCLUSIVEADDRUSE)) && \
+    (!defined(LWIP_SOCKET) || (defined(LWIP_SOCKET) && SO_REUSE == 1))
+        // 1. SO_RESUSEADDR is not enabled on Windows because the semantics of
+        //    SO_REUSEADDR on UNIX and Windows is different. On Windows,
+        //    SO_REUSEADDR allows to bind a socket to a port without error even
+        //    if the port is already open by another program. This is not the
+        //    behavior SO_REUSEADDR was designed for, and leads to hard-to-track
+        //    failure scenarios. Therefore, SO_REUSEADDR was disabled on Windows
+        //    unless SO_EXCLUSIVEADDRUSE is supported and set on a socket.
+        // 2. In case of LWIP, SO_REUSEADDR should be explicitly enabled, by
+        // defining
+        //    SO_REUSE (in lwipopts.h), otherwise the code below will compile
+        //    but won't work! (setsockopt will return EINVAL)
+        !setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on)) &&
 #endif
-  sock_t sock = sl_Socket(AF_INET, SOCK_STREAM, proto);
-  if (sock < 0) {
-    nc->err = sock;
-    goto out;
-  }
-  mg_sock_set(nc, sock);
-#if MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_SIMPLELINK
-  nc->err = sl_set_ssl_opts(sock, nc);
-  if (nc->err != 0) goto out;
+#if defined(_WIN32) && defined(SO_EXCLUSIVEADDRUSE) && !defined(WINCE)
+        // "Using SO_REUSEADDR and SO_EXCLUSIVEADDRUSE"
+        //! setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &on, sizeof(on))
+        //! &&
+        !setsockopt(fd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char *) &on,
+                    sizeof(on)) &&
+#endif
+        bind(fd, &usa.sa, slen) == 0 &&
+        // NOTE(lsm): FreeRTOS uses backlog value as a connection limit
+        (type == SOCK_DGRAM || listen(fd, MG_SOCK_LISTEN_BACKLOG_SIZE) == 0)) {
+      // In case port was set to 0, get the real port number
+      if (getsockname(fd, &usa.sa, &slen) == 0) {
+        addr->port = usa.sin.sin_port;
+#if MG_ENABLE_IPV6
+        if (addr->is_ip6) addr->port = usa.sin6.sin6_port;
 #endif
-  nc->err = sl_Connect(sock, &sa->sa, sizeof(sa->sin));
-out:
-  DBG(("%p to %s:%d sock %d %d err %d", nc, inet_ntoa(sa->sin.sin_addr),
-       ntohs(sa->sin.sin_port), nc->sock, proto, nc->err));
-}
-
-static void mg_sl_if_connect_udp(struct mg_connection *nc) {
-  sock_t sock = sl_Socket(AF_INET, SOCK_DGRAM, 0);
-  if (sock < 0) {
-    nc->err = sock;
-    return;
+      }
+      mg_set_non_blocking_mode(fd);
+    } else if (fd != INVALID_SOCKET) {
+      s_err = MG_SOCK_ERRNO;
+      closesocket(fd);
+      fd = INVALID_SOCKET;
+    }
+  }
+  if (fd == INVALID_SOCKET) {
+    if (s_err == 0) s_err = MG_SOCK_ERRNO;
+    LOG(LL_ERROR, ("Failed to listen on %s, errno %d", url, s_err));
   }
-  mg_sock_set(nc, sock);
-  nc->err = 0;
-}
-
-static int mg_sl_if_listen_tcp(struct mg_connection *nc,
-                               union socket_address *sa) {
-  int proto = 0;
-  if (nc->flags & MG_F_SSL) proto = SL_SEC_SOCKET;
-  sock_t sock = mg_open_listening_socket(nc, sa, SOCK_STREAM, proto);
-  if (sock < 0) return sock;
-  mg_sock_set(nc, sock);
-  return 0;
-}
-
-static int mg_sl_if_listen_udp(struct mg_connection *nc,
-                               union socket_address *sa) {
-  sock_t sock = mg_open_listening_socket(nc, sa, SOCK_DGRAM, 0);
-  if (sock == INVALID_SOCKET) return (errno ? errno : 1);
-  mg_sock_set(nc, sock);
-  return 0;
-}
-
-static int mg_sl_if_tcp_send(struct mg_connection *nc, const void *buf,
-                             size_t len) {
-  int n = (int) sl_Send(nc->sock, buf, len, 0);
-  if (n < 0 && !mg_is_error(n)) n = 0;
-  return n;
-}
 
-static int mg_sl_if_udp_send(struct mg_connection *nc, const void *buf,
-                             size_t len) {
-  int n = sl_SendTo(nc->sock, buf, len, 0, &nc->sa.sa, sizeof(nc->sa.sin));
-  if (n < 0 && !mg_is_error(n)) n = 0;
-  return n;
+  return fd;
 }
 
-static int mg_sl_if_tcp_recv(struct mg_connection *nc, void *buf, size_t len) {
-  int n = sl_Recv(nc->sock, buf, len, 0);
-  if (n == 0) {
-    /* Orderly shutdown of the socket, try flushing output. */
-    nc->flags |= MG_F_SEND_AND_CLOSE;
-  } else if (n < 0 && !mg_is_error(n)) {
-    n = 0;
+static long mg_sock_recv(struct mg_connection *c, void *buf, size_t len) {
+  long n = 0;
+  if (c->is_udp) {
+    union usa usa;
+    socklen_t slen = tousa(&c->peer, &usa);
+    n = recvfrom(FD(c), (char *) buf, len, 0, &usa.sa, &slen);
+    if (n > 0) tomgaddr(&usa, &c->peer, slen != sizeof(usa.sin));
+  } else {
+    n = recv(FD(c), (char *) buf, len, MSG_NONBLOCKING);
   }
-  return n;
+  return n == 0 ? -1 : n < 0 && mg_sock_would_block() ? 0 : n;
 }
 
-static int mg_sl_if_udp_recv(struct mg_connection *nc, void *buf, size_t len,
-                             union socket_address *sa, size_t *sa_len) {
-  SlSocklen_t sa_len_t = *sa_len;
-  int n = sl_RecvFrom(nc->sock, buf, MG_UDP_RECV_BUFFER_SIZE, 0,
-                      (SlSockAddr_t *) sa, &sa_len_t);
-  *sa_len = sa_len_t;
-  if (n < 0 && !mg_is_error(n)) n = 0;
+// NOTE(lsm): do only one iteration of reads, cause some systems
+// (e.g. FreeRTOS stack) return 0 instead of -1/EWOULDBLOCK when no data
+static long read_conn(struct mg_connection *c) {
+  long n = -1;
+  if (c->recv.len >= MG_MAX_RECV_BUF_SIZE) {
+    mg_error(c, "max_recv_buf_size reached");
+  } else if (c->recv.size - c->recv.len < MG_IO_SIZE &&
+             !mg_iobuf_resize(&c->recv, c->recv.size + MG_IO_SIZE)) {
+    mg_error(c, "oom");
+  } else {
+    char *buf = (char *) &c->recv.buf[c->recv.len];
+    size_t len = c->recv.size - c->recv.len;
+    n = c->is_tls ? mg_tls_recv(c, buf, len) : mg_sock_recv(c, buf, len);
+    iolog(c, buf, n, true);
+  }
   return n;
 }
 
-static int mg_sl_if_create_conn(struct mg_connection *nc) {
-  (void) nc;
-  return 1;
-}
-
-void mg_sl_if_destroy_conn(struct mg_connection *nc) {
-  if (nc->sock == INVALID_SOCKET) return;
-  /* For UDP, only close outgoing sockets or listeners. */
-  if (!(nc->flags & MG_F_UDP) || nc->listener == NULL) {
-    sl_Close(nc->sock);
-  }
-  nc->sock = INVALID_SOCKET;
+static void write_conn(struct mg_connection *c) {
+  char *buf = (char *) c->send.buf;
+  size_t len = c->send.len;
+  long n = c->is_tls ? mg_tls_send(c, buf, len) : mg_sock_send(c, buf, len);
+  iolog(c, buf, n, false);
 }
 
-static int mg_accept_conn(struct mg_connection *lc) {
-  struct mg_connection *nc;
-  union socket_address sa;
-  socklen_t sa_len = sizeof(sa);
-  sock_t sock = sl_Accept(lc->sock, &sa.sa, &sa_len);
-  if (sock < 0) {
-    DBG(("%p: failed to accept: %d", lc, sock));
-    return 0;
-  }
-  nc = mg_if_accept_new_conn(lc);
-  if (nc == NULL) {
-    sl_Close(sock);
-    return 0;
-  }
-  DBG(("%p conn from %s:%d", nc, inet_ntoa(sa.sin.sin_addr),
-       ntohs(sa.sin.sin_port)));
-  mg_sock_set(nc, sock);
-  mg_if_accept_tcp_cb(nc, &sa, sa_len);
-  return 1;
-}
-
-/* 'sa' must be an initialized address to bind to */
-static sock_t mg_open_listening_socket(struct mg_connection *nc,
-                                       union socket_address *sa, int type,
-                                       int proto) {
-  int r;
-  socklen_t sa_len =
-      (sa->sa.sa_family == AF_INET) ? sizeof(sa->sin) : sizeof(sa->sin6);
-  sock_t sock = sl_Socket(sa->sa.sa_family, type, proto);
-  if (sock < 0) return sock;
-#if MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_SIMPLELINK
-  if ((r = sl_set_ssl_opts(sock, nc)) < 0) goto clean;
+static void close_conn(struct mg_connection *c) {
+  mg_resolve_cancel(c);  // Close any pending DNS query
+  LIST_DELETE(struct mg_connection, &c->mgr->conns, c);
+  if (c == c->mgr->dns4.c) c->mgr->dns4.c = NULL;
+  if (c == c->mgr->dns6.c) c->mgr->dns6.c = NULL;
+  // Order of operations is important. `MG_EV_CLOSE` event must be fired
+  // before we deallocate received data, see #1331
+  mg_call(c, MG_EV_CLOSE, NULL);
+  LOG(LL_DEBUG, ("%lu closed", c->id));
+  if (FD(c) != INVALID_SOCKET) {
+    closesocket(FD(c));
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+    FreeRTOS_FD_CLR(c->fd, c->mgr->ss, eSELECT_ALL);
 #endif
-  if ((r = sl_Bind(sock, &sa->sa, sa_len)) < 0) goto clean;
-  if (type != SOCK_DGRAM) {
-    if ((r = sl_Listen(sock, SOMAXCONN)) < 0) goto clean;
+    c->fd = S2PTR(INVALID_SOCKET);
   }
-  mg_set_non_blocking_mode(sock);
-clean:
-  if (r < 0) {
-    sl_Close(sock);
-    sock = r;
-  }
-  return sock;
+  mg_tls_free(c);
+  mg_iobuf_free(&c->recv);
+  mg_iobuf_free(&c->send);
+  memset(c, 0, sizeof(*c));
+  free(c);
 }
 
-#define _MG_F_FD_CAN_READ 1
-#define _MG_F_FD_CAN_WRITE 1 << 1
-#define _MG_F_FD_ERROR 1 << 2
-
-void mg_mgr_handle_conn(struct mg_connection *nc, int fd_flags, double now) {
-  DBG(("%p fd=%d fd_flags=%d nc_flags=0x%lx rmbl=%d smbl=%d", nc, nc->sock,
-       fd_flags, nc->flags, (int) nc->recv_mbuf.len, (int) nc->send_mbuf.len));
-
-  if (!mg_if_poll(nc, now)) return;
-
-  if (nc->flags & MG_F_CONNECTING) {
-    if ((nc->flags & MG_F_UDP) || nc->err != SL_ERROR_BSD_EALREADY) {
-      mg_if_connect_cb(nc, nc->err);
-    } else {
-      /* In SimpleLink, to get status of non-blocking connect() we need to wait
-       * until socket is writable and repeat the call to sl_Connect again,
-       * which will now return the real status. */
-      if (fd_flags & _MG_F_FD_CAN_WRITE) {
-        nc->err = sl_Connect(nc->sock, &nc->sa.sa, sizeof(nc->sa.sin));
-        DBG(("%p conn res=%d", nc, nc->err));
-        if (nc->err == SL_ERROR_BSD_ESECSNOVERIFY ||
-            /* TODO(rojer): Provide API to set the date for verification. */
-            nc->err == SL_ERROR_BSD_ESECDATEERROR
-#if SL_MAJOR_VERSION_NUM >= 2
-            /* Per SWRU455, this error does not mean verification failed,
-             * it only means that the cert used is not present in the trusted
-             * root CA catalog. Which is perfectly fine. */
-            ||
-            nc->err == SL_ERROR_BSD_ESECUNKNOWNROOTCA
+static void setsockopts(struct mg_connection *c) {
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_AZURERTOS
+  (void) c;
+#else
+  int on = 1;
+#if !defined(SOL_TCP)
+#define SOL_TCP IPPROTO_TCP
 #endif
-            ) {
-          nc->err = 0;
-        }
-        mg_if_connect_cb(nc, nc->err);
-      }
-    }
-    /* Ignore read/write in further processing, we've handled it. */
-    fd_flags &= ~(_MG_F_FD_CAN_READ | _MG_F_FD_CAN_WRITE);
+  setsockopt(FD(c), SOL_TCP, TCP_NODELAY, (char *) &on, sizeof(on));
+#if defined(TCP_QUICKACK)
+  setsockopt(FD(c), SOL_TCP, TCP_QUICKACK, (char *) &on, sizeof(on));
+#endif
+  setsockopt(FD(c), SOL_SOCKET, SO_KEEPALIVE, (char *) &on, sizeof(on));
+#if (defined(ESP32) && ESP32) || (defined(ESP8266) && ESP8266) || \
+    defined(__linux__)
+  int idle = 60;
+  setsockopt(FD(c), IPPROTO_TCP, TCP_KEEPIDLE, &idle, sizeof(idle));
+#endif
+#if !defined(_WIN32) && !defined(__QNX__)
+  {
+    int cnt = 3, intvl = 20;
+    setsockopt(FD(c), IPPROTO_TCP, TCP_KEEPCNT, &cnt, sizeof(cnt));
+    setsockopt(FD(c), IPPROTO_TCP, TCP_KEEPINTVL, &intvl, sizeof(intvl));
   }
+#endif
+#endif
+}
 
-  if (fd_flags & _MG_F_FD_CAN_READ) {
-    if (nc->flags & MG_F_UDP) {
-      mg_if_can_recv_cb(nc);
+void mg_connect_resolved(struct mg_connection *c) {
+  // char buf[40];
+  int type = c->is_udp ? SOCK_DGRAM : SOCK_STREAM;
+  int rc, af = c->peer.is_ip6 ? AF_INET6 : AF_INET;
+  // mg_straddr(&c->peer, buf, sizeof(buf));
+  c->fd = S2PTR(socket(af, type, 0));
+  if (FD(c) == INVALID_SOCKET) {
+    mg_error(c, "socket(): %d", MG_SOCK_ERRNO);
+  } else if (c->is_udp) {
+    mg_call(c, MG_EV_RESOLVE, NULL);
+    mg_call(c, MG_EV_CONNECT, NULL);
+  } else {
+    union usa usa;
+    socklen_t slen = tousa(&c->peer, &usa);
+    mg_set_non_blocking_mode(FD(c));
+    setsockopts(c);
+    mg_call(c, MG_EV_RESOLVE, NULL);
+    if ((rc = connect(FD(c), &usa.sa, slen)) == 0) {
+      mg_call(c, MG_EV_CONNECT, NULL);
+    } else if (mg_sock_would_block()) {
+      c->is_connecting = 1;
     } else {
-      if (nc->flags & MG_F_LISTENING) {
-        mg_accept_conn(nc);
-      } else {
-        mg_if_can_recv_cb(nc);
-      }
+      mg_error(c, "connect: %d", MG_SOCK_ERRNO);
     }
   }
+}
 
-  if (fd_flags & _MG_F_FD_CAN_WRITE) {
-    mg_if_can_send_cb(nc);
+struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *url,
+                                 mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = NULL;
+  if (url == NULL || url[0] == '\0') {
+    LOG(LL_ERROR, ("null url"));
+  } else if ((c = alloc_conn(mgr, 1, INVALID_SOCKET)) == NULL) {
+    LOG(LL_ERROR, ("OOM"));
+  } else {
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+    c->is_udp = (strncmp(url, "udp:", 4) == 0);
+    c->fn = fn;
+    c->fn_data = fn_data;
+    LOG(LL_DEBUG, ("%lu -> %s", c->id, url));
+    mg_call(c, MG_EV_OPEN, NULL);
+    mg_resolve(c, url);
   }
-
-  DBG(("%p after fd=%d nc_flags=0x%lx rmbl=%d smbl=%d", nc, nc->sock, nc->flags,
-       (int) nc->recv_mbuf.len, (int) nc->send_mbuf.len));
+  return c;
 }
 
-/* Associate a socket to a connection. */
-void mg_sl_if_sock_set(struct mg_connection *nc, sock_t sock) {
-  mg_set_non_blocking_mode(sock);
-  nc->sock = sock;
-  DBG(("%p %d", nc, sock));
+static void accept_conn(struct mg_mgr *mgr, struct mg_connection *lsn) {
+  struct mg_connection *c = NULL;
+  union usa usa;
+  socklen_t sa_len = sizeof(usa);
+  SOCKET fd = accept(FD(lsn), &usa.sa, &sa_len);
+  if (fd == INVALID_SOCKET) {
+#if MG_ARCH == MG_ARCH_AZURERTOS
+    // AzureRTOS, in non-block socket mode can mark listening socket readable
+    // even it is not. See comment for 'select' func implementation in nx_bsd.c
+    // That's not an error, just should try later
+    if (MG_SOCK_ERRNO != EAGAIN)
+#endif
+      LOG(LL_ERROR, ("%lu accept failed, errno %d", lsn->id, MG_SOCK_ERRNO));
+#if (!defined(_WIN32) && (MG_ARCH != MG_ARCH_FREERTOS_TCP))
+  } else if ((long) fd >= FD_SETSIZE) {
+    LOG(LL_ERROR, ("%ld > %ld", (long) fd, (long) FD_SETSIZE));
+    closesocket(fd);
+#endif
+  } else if ((c = alloc_conn(mgr, 0, fd)) == NULL) {
+    LOG(LL_ERROR, ("%lu OOM", lsn->id));
+    closesocket(fd);
+  } else {
+    char buf[40];
+    tomgaddr(&usa, &c->peer, sa_len != sizeof(usa.sin));
+    mg_straddr(&c->peer, buf, sizeof(buf));
+    LOG(LL_DEBUG, ("%lu accepted %s", c->id, buf));
+    mg_set_non_blocking_mode(FD(c));
+    setsockopts(c);
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+    c->is_accepted = 1;
+    c->is_hexdumping = lsn->is_hexdumping;
+    c->pfn = lsn->pfn;
+    c->pfn_data = lsn->pfn_data;
+    c->fn = lsn->fn;
+    c->fn_data = lsn->fn_data;
+    mg_call(c, MG_EV_OPEN, NULL);
+    mg_call(c, MG_EV_ACCEPT, NULL);
+  }
+}
+
+static bool mg_socketpair(SOCKET sp[2], union usa usa[2]) {
+  socklen_t n = sizeof(usa[0].sin);
+  bool result = false;
+
+  (void) memset(&usa[0], 0, sizeof(usa[0]));
+  usa[0].sin.sin_family = AF_INET;
+  *(uint32_t *) &usa->sin.sin_addr = mg_htonl(0x7f000001);  // 127.0.0.1
+  usa[1] = usa[0];
+
+  if ((sp[0] = socket(AF_INET, SOCK_DGRAM, 0)) != INVALID_SOCKET &&
+      (sp[1] = socket(AF_INET, SOCK_DGRAM, 0)) != INVALID_SOCKET &&
+      bind(sp[0], &usa[0].sa, n) == 0 && bind(sp[1], &usa[1].sa, n) == 0 &&
+      getsockname(sp[0], &usa[0].sa, &n) == 0 &&
+      getsockname(sp[1], &usa[1].sa, &n) == 0 &&
+      connect(sp[0], &usa[1].sa, n) == 0 &&
+      connect(sp[1], &usa[0].sa, n) == 0) {
+    mg_set_non_blocking_mode(sp[1]);  // Set close-on-exec
+    result = true;
+  } else {
+    if (sp[0] != INVALID_SOCKET) closesocket(sp[0]);
+    if (sp[1] != INVALID_SOCKET) closesocket(sp[1]);
+    sp[0] = sp[1] = INVALID_SOCKET;
+  }
+
+  return result;
 }
 
-void mg_sl_if_init(struct mg_iface *iface) {
-  (void) iface;
-  DBG(("%p using sl_Select()", iface->mgr));
+void mg_mgr_wakeup(struct mg_connection *c, const void *buf, size_t len) {
+  if (buf == NULL || len == 0) buf = (void *) "", len = 1;
+  send((SOCKET) (size_t) c->pfn_data, (const char *) buf, len, MSG_NONBLOCKING);
 }
 
-void mg_sl_if_free(struct mg_iface *iface) {
-  (void) iface;
+static void pf1(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_READ) {
+    mg_iobuf_free(&c->recv);
+  } else if (ev == MG_EV_CLOSE) {
+    closesocket((SOCKET) (size_t) c->pfn_data);
+  }
+  (void) ev_data, (void) fn_data;
 }
 
-void mg_sl_if_add_conn(struct mg_connection *nc) {
-  (void) nc;
+struct mg_connection *mg_mkpipe(struct mg_mgr *mgr, mg_event_handler_t fn,
+                                void *fn_data) {
+  union usa usa[2];
+  SOCKET sp[2] = {INVALID_SOCKET, INVALID_SOCKET};
+  struct mg_connection *c = NULL;
+  if (!mg_socketpair(sp, usa)) {
+    LOG(LL_ERROR, ("Cannot create socket pair"));
+  } else if ((c = alloc_conn(mgr, false, sp[1])) == NULL) {
+    closesocket(sp[0]);
+    closesocket(sp[1]);
+    LOG(LL_ERROR, ("OOM"));
+  } else {
+    LOG(LL_INFO, ("pipe %lu", (unsigned long) sp[0]));
+    tomgaddr(&usa[0], &c->peer, false);
+    c->is_udp = 1;
+    c->pfn = pf1;
+    c->pfn_data = (void *) (size_t) sp[0];
+    c->fn = fn;
+    c->fn_data = fn_data;
+    mg_call(c, MG_EV_OPEN, NULL);
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+  }
+  return c;
 }
 
-void mg_sl_if_remove_conn(struct mg_connection *nc) {
-  (void) nc;
+struct mg_connection *mg_listen(struct mg_mgr *mgr, const char *url,
+                                mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = NULL;
+  bool is_udp = strncmp(url, "udp:", 4) == 0;
+  struct mg_addr addr;
+  SOCKET fd = mg_open_listener(url, &addr);
+  if (fd == INVALID_SOCKET) {
+    LOG(LL_ERROR, ("Failed: %s, errno %d", url, MG_SOCK_ERRNO));
+  } else if ((c = alloc_conn(mgr, 0, fd)) == NULL) {
+    LOG(LL_ERROR, ("OOM %s", url));
+    closesocket(fd);
+  } else {
+    memcpy(&c->peer, &addr, sizeof(struct mg_addr));
+    c->fd = S2PTR(fd);
+    c->is_listening = 1;
+    c->is_udp = is_udp;
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+    c->fn = fn;
+    c->fn_data = fn_data;
+    mg_call(c, MG_EV_OPEN, NULL);
+    LOG(LL_DEBUG,
+        ("%lu accepting on %s (port %u)", c->id, url, mg_ntohs(c->peer.port)));
+  }
+  return c;
 }
 
-time_t mg_sl_if_poll(struct mg_iface *iface, int timeout_ms) {
-  struct mg_mgr *mgr = iface->mgr;
-  double now = mg_time();
-  double min_timer;
-  struct mg_connection *nc, *tmp;
-  struct SlTimeval_t tv;
-  SlFdSet_t read_set, write_set, err_set;
-  sock_t max_fd = INVALID_SOCKET;
-  int num_fds, num_ev = 0, num_timers = 0;
+static void mg_iotest(struct mg_mgr *mgr, int ms) {
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+  struct mg_connection *c;
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    if (c->is_closing || c->is_resolving || FD(c) == INVALID_SOCKET) continue;
+    FreeRTOS_FD_SET(c->fd, mgr->ss, eSELECT_READ | eSELECT_EXCEPT);
+    if (c->is_connecting || (c->send.len > 0 && c->is_tls_hs == 0))
+      FreeRTOS_FD_SET(c->fd, mgr->ss, eSELECT_WRITE);
+  }
+  FreeRTOS_select(mgr->ss, pdMS_TO_TICKS(ms));
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    EventBits_t bits = FreeRTOS_FD_ISSET(c->fd, mgr->ss);
+    c->is_readable = bits & (eSELECT_READ | eSELECT_EXCEPT) ? 1 : 0;
+    c->is_writable = bits & eSELECT_WRITE ? 1 : 0;
+    FreeRTOS_FD_CLR(c->fd, mgr->ss,
+                    eSELECT_READ | eSELECT_EXCEPT | eSELECT_WRITE);
+  }
+#else
+  struct timeval tv = {ms / 1000, (ms % 1000) * 1000};
+  struct mg_connection *c;
+  fd_set rset, wset;
+  SOCKET maxfd = 0;
+  int rc;
 
-  SL_SOCKET_FD_ZERO(&read_set);
-  SL_SOCKET_FD_ZERO(&write_set);
-  SL_SOCKET_FD_ZERO(&err_set);
+  FD_ZERO(&rset);
+  FD_ZERO(&wset);
 
-  /*
-   * Note: it is ok to have connections with sock == INVALID_SOCKET in the list,
-   * e.g. timer-only "connections".
-   */
-  min_timer = 0;
-  for (nc = mgr->active_connections, num_fds = 0; nc != NULL; nc = tmp) {
-    tmp = nc->next;
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    if (c->is_closing || c->is_resolving || FD(c) == INVALID_SOCKET) continue;
+    FD_SET(FD(c), &rset);
+    if (FD(c) > maxfd) maxfd = FD(c);
+    if (c->is_connecting || (c->send.len > 0 && c->is_tls_hs == 0))
+      FD_SET(FD(c), &wset);
+  }
 
-    if (nc->sock != INVALID_SOCKET) {
-      num_fds++;
+  if ((rc = select((int) maxfd + 1, &rset, &wset, NULL, &tv)) < 0) {
+    LOG(LL_DEBUG, ("select: %d %d", rc, MG_SOCK_ERRNO));
+    FD_ZERO(&rset);
+    FD_ZERO(&wset);
+  }
 
-      if (!(nc->flags & MG_F_WANT_WRITE) &&
-          nc->recv_mbuf.len < nc->recv_mbuf_limit &&
-          (!(nc->flags & MG_F_UDP) || nc->listener == NULL)) {
-        SL_SOCKET_FD_SET(nc->sock, &read_set);
-        if (max_fd == INVALID_SOCKET || nc->sock > max_fd) max_fd = nc->sock;
-      }
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    // TLS might have stuff buffered, so dig everything
+    c->is_readable = FD(c) != INVALID_SOCKET && FD_ISSET(FD(c), &rset);
+    c->is_writable = FD(c) != INVALID_SOCKET && FD_ISSET(FD(c), &wset);
+  }
+#endif
+}
 
-      if (((nc->flags & MG_F_CONNECTING) && !(nc->flags & MG_F_WANT_READ)) ||
-          (nc->send_mbuf.len > 0 && !(nc->flags & MG_F_CONNECTING))) {
-        SL_SOCKET_FD_SET(nc->sock, &write_set);
-        SL_SOCKET_FD_SET(nc->sock, &err_set);
-        if (max_fd == INVALID_SOCKET || nc->sock > max_fd) max_fd = nc->sock;
-      }
+static void connect_conn(struct mg_connection *c) {
+  int rc = 0;
+#if MG_ARCH != MG_ARCH_FREERTOS_TCP
+  socklen_t len = sizeof(rc);
+  if (getsockopt(FD(c), SOL_SOCKET, SO_ERROR, (char *) &rc, &len)) rc = 1;
+#endif
+  if (rc == EAGAIN || rc == EWOULDBLOCK) rc = 0;
+  c->is_connecting = 0;
+  if (rc) {
+    char buf[50];
+    mg_error(c, "error connecting to %s",
+             mg_straddr(&c->peer, buf, sizeof(buf)));
+  } else {
+    if (c->is_tls_hs) mg_tls_handshake(c);
+    mg_call(c, MG_EV_CONNECT, NULL);
+  }
+}
+
+void mg_mgr_poll(struct mg_mgr *mgr, int ms) {
+  struct mg_connection *c, *tmp;
+  int64_t now;
+
+  mg_iotest(mgr, ms);
+  now = mg_millis();
+  mg_timer_poll(now);
+
+  for (c = mgr->conns; c != NULL; c = tmp) {
+    tmp = c->next;
+    mg_call(c, MG_EV_POLL, &now);
+    LOG(LL_VERBOSE_DEBUG,
+        ("%lu %c%c %c%c%c%c%c", c->id, c->is_readable ? 'r' : '-',
+         c->is_writable ? 'w' : '-', c->is_tls ? 'T' : 't',
+         c->is_connecting ? 'C' : 'c', c->is_tls_hs ? 'H' : 'h',
+         c->is_resolving ? 'R' : 'r', c->is_closing ? 'C' : 'c'));
+    if (c->is_resolving || c->is_closing) {
+      // Do nothing
+    } else if (c->is_listening && c->is_udp == 0) {
+      if (c->is_readable) accept_conn(mgr, c);
+    } else if (c->is_connecting) {
+      if (c->is_readable || c->is_writable) connect_conn(c);
+    } else if (c->is_tls_hs) {
+      if ((c->is_readable || c->is_writable)) mg_tls_handshake(c);
+    } else {
+      if (c->is_readable) read_conn(c);
+      if (c->is_writable) write_conn(c);
+      while (c->is_tls && read_conn(c) > 0) (void) 0;  // Read buffered TLS data
     }
 
-    if (nc->ev_timer_time > 0) {
-      if (num_timers == 0 || nc->ev_timer_time < min_timer) {
-        min_timer = nc->ev_timer_time;
-      }
-      num_timers++;
-    }
+    if (c->is_draining && c->send.len == 0) c->is_closing = 1;
+    if (c->is_closing) close_conn(c);
   }
+}
+#endif
 
-  /*
-   * If there is a timer to be fired earlier than the requested timeout,
-   * adjust the timeout.
-   */
-  if (num_timers > 0) {
-    double timer_timeout_ms = (min_timer - mg_time()) * 1000 + 1 /* rounding */;
-    if (timer_timeout_ms < timeout_ms) {
-      timeout_ms = timer_timeout_ms;
-    }
-  }
-  if (timeout_ms < 0) timeout_ms = 0;
+#ifdef MG_ENABLE_LINES
+#line 1 "src/ssi.c"
+#endif
 
-  tv.tv_sec = timeout_ms / 1000;
-  tv.tv_usec = (timeout_ms % 1000) * 1000;
 
-  if (num_fds > 0) {
-    num_ev = sl_Select((int) max_fd + 1, &read_set, &write_set, &err_set, &tv);
-  }
 
-  now = mg_time();
-  DBG(("sl_Select @ %ld num_ev=%d of %d, timeout=%d", (long) now, num_ev,
-       num_fds, timeout_ms));
 
-  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
-    int fd_flags = 0;
-    if (nc->sock != INVALID_SOCKET) {
-      if (num_ev > 0) {
-        fd_flags =
-            (SL_SOCKET_FD_ISSET(nc->sock, &read_set) &&
-                     (!(nc->flags & MG_F_UDP) || nc->listener == NULL)
-                 ? _MG_F_FD_CAN_READ
-                 : 0) |
-            (SL_SOCKET_FD_ISSET(nc->sock, &write_set) ? _MG_F_FD_CAN_WRITE
-                                                      : 0) |
-            (SL_SOCKET_FD_ISSET(nc->sock, &err_set) ? _MG_F_FD_ERROR : 0);
-      }
-      /* SimpleLink does not report UDP sockets as writable. */
-      if (nc->flags & MG_F_UDP && nc->send_mbuf.len > 0) {
-        fd_flags |= _MG_F_FD_CAN_WRITE;
+#ifndef MG_MAX_SSI_DEPTH
+#define MG_MAX_SSI_DEPTH 5
+#endif
+
+#if MG_ENABLE_SSI
+static char *mg_ssi(const char *path, const char *root, int depth) {
+  struct mg_iobuf b = {NULL, 0, 0};
+  FILE *fp = fopen(path, "rb");
+  if (fp != NULL) {
+    char buf[BUFSIZ], arg[sizeof(buf)];
+    int ch, intag = 0;
+    size_t len = 0, align = MG_IO_SIZE;
+    while ((ch = fgetc(fp)) != EOF) {
+      if (intag && ch == '>' && buf[len - 1] == '-' && buf[len - 2] == '-') {
+        buf[len++] = (char) (ch & 0xff);
+        if (sscanf(buf, "<!--#include file=\"%[^\"]", arg)) {
+          char tmp[MG_PATH_MAX + BUFSIZ + 10],
+              *p = (char *) path + strlen(path), *data;
+          while (p > path && p[-1] != MG_DIRSEP && p[-1] != '/') p--;
+          snprintf(tmp, sizeof(tmp), "%.*s%s", (int) (p - path), path, arg);
+          if (depth < MG_MAX_SSI_DEPTH &&
+              (data = mg_ssi(tmp, root, depth + 1)) != NULL) {
+            mg_iobuf_add(&b, b.len, data, strlen(data), align);
+            free(data);
+          } else {
+            LOG(LL_ERROR, ("%s: file=%s error or too deep", path, arg));
+          }
+        } else if (sscanf(buf, "<!--#include virtual=\"%[^\"]", arg)) {
+          char tmp[MG_PATH_MAX + BUFSIZ + 10], *data;
+          snprintf(tmp, sizeof(tmp), "%s%s", root, arg);
+          if (depth < MG_MAX_SSI_DEPTH &&
+              (data = mg_ssi(tmp, root, depth + 1)) != NULL) {
+            mg_iobuf_add(&b, b.len, data, strlen(data), align);
+            free(data);
+          } else {
+            LOG(LL_ERROR, ("%s: virtual=%s error or too deep", path, arg));
+          }
+        } else {
+          // Unknown SSI tag
+          LOG(LL_INFO, ("Unknown SSI tag: %.*s", (int) len, buf));
+          mg_iobuf_add(&b, b.len, buf, len, align);
+        }
+        intag = 0;
+        len = 0;
+      } else if (ch == '<') {
+        intag = 1;
+        if (len > 0) mg_iobuf_add(&b, b.len, buf, len, align);
+        len = 0;
+        buf[len++] = (char) (ch & 0xff);
+      } else if (intag) {
+        if (len == 5 && strncmp(buf, "<!--#", 5) != 0) {
+          intag = 0;
+        } else if (len >= sizeof(buf) - 2) {
+          LOG(LL_ERROR, ("%s: SSI tag is too large", path));
+          len = 0;
+        }
+        buf[len++] = (char) (ch & 0xff);
+      } else {
+        buf[len++] = (char) (ch & 0xff);
+        if (len >= sizeof(buf)) {
+          mg_iobuf_add(&b, b.len, buf, len, align);
+          len = 0;
+        }
       }
     }
-    tmp = nc->next;
-    mg_mgr_handle_conn(nc, fd_flags, now);
-  }
-
-  return now;
-}
-
-void mg_sl_if_get_conn_addr(struct mg_connection *nc, int remote,
-                            union socket_address *sa) {
-  /* SimpleLink does not provide a way to get socket's peer address after
-   * accept or connect. Address should have been preserved in the connection,
-   * so we do our best here by using it. */
-  if (remote) memcpy(sa, &nc->sa, sizeof(*sa));
-}
-
-void sl_restart_cb(struct mg_mgr *mgr) {
-  /*
-   * SimpleLink has been restarted, meaning all sockets have been invalidated.
-   * We try our best - we'll restart the listeners, but for outgoing
-   * connections we have no option but to terminate.
-   */
-  struct mg_connection *nc;
-  for (nc = mg_next(mgr, NULL); nc != NULL; nc = mg_next(mgr, nc)) {
-    if (nc->sock == INVALID_SOCKET) continue; /* Could be a timer */
-    if (nc->flags & MG_F_LISTENING) {
-      DBG(("restarting %p %s:%d", nc, inet_ntoa(nc->sa.sin.sin_addr),
-           ntohs(nc->sa.sin.sin_port)));
-      int res = (nc->flags & MG_F_UDP ? mg_sl_if_listen_udp(nc, &nc->sa)
-                                      : mg_sl_if_listen_tcp(nc, &nc->sa));
-      if (res == 0) continue;
-      /* Well, we tried and failed. Fall through to closing. */
-    }
-    nc->sock = INVALID_SOCKET;
-    DBG(("terminating %p %s:%d", nc, inet_ntoa(nc->sa.sin.sin_addr),
-         ntohs(nc->sa.sin.sin_port)));
-    /* TODO(rojer): Outgoing UDP? */
-    nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-  }
-}
-
-/* clang-format off */
-#define MG_SL_IFACE_VTABLE                                              \
-  {                                                                     \
-    mg_sl_if_init,                                                      \
-    mg_sl_if_free,                                                      \
-    mg_sl_if_add_conn,                                                  \
-    mg_sl_if_remove_conn,                                               \
-    mg_sl_if_poll,                                                      \
-    mg_sl_if_listen_tcp,                                                \
-    mg_sl_if_listen_udp,                                                \
-    mg_sl_if_connect_tcp,                                               \
-    mg_sl_if_connect_udp,                                               \
-    mg_sl_if_tcp_send,                                                  \
-    mg_sl_if_udp_send,                                                  \
-    mg_sl_if_tcp_recv,                                                  \
-    mg_sl_if_udp_recv,                                                  \
-    mg_sl_if_create_conn,                                               \
-    mg_sl_if_destroy_conn,                                              \
-    mg_sl_if_sock_set,                                                  \
-    mg_sl_if_get_conn_addr,                                             \
-  }
-/* clang-format on */
-
-const struct mg_iface_vtable mg_simplelink_iface_vtable = MG_SL_IFACE_VTABLE;
-#if MG_NET_IF == MG_NET_IF_SIMPLELINK
-const struct mg_iface_vtable mg_default_iface_vtable = MG_SL_IFACE_VTABLE;
-#endif
+    if (len > 0) mg_iobuf_add(&b, b.len, buf, len, align);
+    if (b.len > 0) mg_iobuf_add(&b, b.len, "", 1, align);  // nul-terminate
+    fclose(fp);
+  }
+  (void) depth;
+  (void) root;
+  return (char *) b.buf;
+}
 
-#endif /* MG_ENABLE_NET_IF_SIMPLELINK */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/simplelink/sl_ssl_if.c"
+void mg_http_serve_ssi(struct mg_connection *c, const char *root,
+                       const char *fullpath) {
+  const char *headers = "Content-Type: text/html; charset=utf-8\r\n";
+  char *data = mg_ssi(fullpath, root, 0);
+  mg_http_reply(c, 200, headers, "%s", data == NULL ? "" : data);
+  free(data);
+}
+#else
+void mg_http_serve_ssi(struct mg_connection *c, const char *root,
+                       const char *fullpath) {
+  mg_http_reply(c, 501, NULL, "SSI not enabled");
+  (void) root, (void) fullpath;
+}
 #endif
 
-#if MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_SIMPLELINK
-
-/* Amalgamated: #include "common/mg_mem.h" */
-
-#ifndef MG_SSL_IF_SIMPLELINK_SLFS_PREFIX
-#define MG_SSL_IF_SIMPLELINK_SLFS_PREFIX "SL:"
+#ifdef MG_ENABLE_LINES
+#line 1 "src/str.c"
 #endif
 
-#define MG_SSL_IF_SIMPLELINK_SLFS_PREFIX_LEN \
-  (sizeof(MG_SSL_IF_SIMPLELINK_SLFS_PREFIX) - 1)
+#include <stdlib.h>
 
-struct mg_ssl_if_ctx {
-  char *ssl_cert;
-  char *ssl_key;
-  char *ssl_ca_cert;
-  char *ssl_server_name;
-};
+struct mg_str mg_str_s(const char *s) {
+  struct mg_str str = {s, s == NULL ? 0 : strlen(s)};
+  return str;
+}
 
-void mg_ssl_if_init(void) {
+struct mg_str mg_str_n(const char *s, size_t n) {
+  struct mg_str str = {s, n};
+  return str;
 }
 
-enum mg_ssl_if_result mg_ssl_if_conn_init(
-    struct mg_connection *nc, const struct mg_ssl_if_conn_params *params,
-    const char **err_msg) {
-  struct mg_ssl_if_ctx *ctx =
-      (struct mg_ssl_if_ctx *) MG_CALLOC(1, sizeof(*ctx));
-  if (ctx == NULL) {
-    MG_SET_PTRPTR(err_msg, "Out of memory");
-    return MG_SSL_ERROR;
-  }
-  nc->ssl_if_data = ctx;
+int mg_lower(const char *s) {
+  return tolower(*(const unsigned char *) s);
+}
 
-  if (params->cert != NULL || params->key != NULL) {
-    if (params->cert != NULL && params->key != NULL) {
-      ctx->ssl_cert = strdup(params->cert);
-      ctx->ssl_key = strdup(params->key);
-    } else {
-      MG_SET_PTRPTR(err_msg, "Both cert and key are required.");
-      return MG_SSL_ERROR;
-    }
-  }
-  if (params->ca_cert != NULL && strcmp(params->ca_cert, "*") != 0) {
-    ctx->ssl_ca_cert = strdup(params->ca_cert);
-  }
-  /* TODO(rojer): cipher_suites. */
-  if (params->server_name != NULL) {
-    ctx->ssl_server_name = strdup(params->server_name);
-  }
-  return MG_SSL_OK;
+int mg_ncasecmp(const char *s1, const char *s2, size_t len) {
+  int diff = 0;
+  if (len > 0) do {
+      diff = mg_lower(s1++) - mg_lower(s2++);
+    } while (diff == 0 && s1[-1] != '\0' && --len > 0);
+  return diff;
 }
 
-enum mg_ssl_if_result mg_ssl_if_conn_accept(struct mg_connection *nc,
-                                            struct mg_connection *lc) {
-  /* SimpleLink does everything for us, nothing for us to do. */
-  (void) nc;
-  (void) lc;
-  return MG_SSL_OK;
+int mg_casecmp(const char *s1, const char *s2) {
+  return mg_ncasecmp(s1, s2, (size_t) ~0);
 }
 
-enum mg_ssl_if_result mg_ssl_if_handshake(struct mg_connection *nc) {
-  /* SimpleLink has already performed the handshake, nothing to do. */
-  return MG_SSL_OK;
+int mg_vcmp(const struct mg_str *s1, const char *s2) {
+  size_t n2 = strlen(s2), n1 = s1->len;
+  int r = strncmp(s1->ptr, s2, (n1 < n2) ? n1 : n2);
+  if (r == 0) return (int) (n1 - n2);
+  return r;
 }
 
-int mg_ssl_if_read(struct mg_connection *nc, void *buf, size_t len) {
-  /* SimpelLink handles TLS, so this is just a pass-through. */
-  int n = nc->iface->vtable->tcp_recv(nc, buf, len);
-  if (n == 0) nc->flags |= MG_F_WANT_READ;
-  return n;
+int mg_vcasecmp(const struct mg_str *str1, const char *str2) {
+  size_t n2 = strlen(str2), n1 = str1->len;
+  int r = mg_ncasecmp(str1->ptr, str2, (n1 < n2) ? n1 : n2);
+  if (r == 0) return (int) (n1 - n2);
+  return r;
 }
 
-int mg_ssl_if_write(struct mg_connection *nc, const void *buf, size_t len) {
-  /* SimpelLink handles TLS, so this is just a pass-through. */
-  return nc->iface->vtable->tcp_send(nc, buf, len);
-}
-
-void mg_ssl_if_conn_close_notify(struct mg_connection *nc) {
-  /* Nothing to do */
-  (void) nc;
-}
-
-void mg_ssl_if_conn_free(struct mg_connection *nc) {
-  struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  if (ctx == NULL) return;
-  nc->ssl_if_data = NULL;
-  MG_FREE(ctx->ssl_cert);
-  MG_FREE(ctx->ssl_key);
-  MG_FREE(ctx->ssl_ca_cert);
-  MG_FREE(ctx->ssl_server_name);
-  memset(ctx, 0, sizeof(*ctx));
-  MG_FREE(ctx);
-}
-
-bool pem_to_der(const char *pem_file, const char *der_file) {
-  bool ret = false;
-  FILE *pf = NULL, *df = NULL;
-  bool writing = false;
-  pf = fopen(pem_file, "r");
-  if (pf == NULL) goto clean;
-  remove(der_file);
-  fs_slfs_set_file_size(der_file + MG_SSL_IF_SIMPLELINK_SLFS_PREFIX_LEN, 2048);
-  df = fopen(der_file, "w");
-  fs_slfs_unset_file_flags(der_file + MG_SSL_IF_SIMPLELINK_SLFS_PREFIX_LEN);
-  if (df == NULL) goto clean;
-  while (1) {
-    char pem_buf[70];
-    char der_buf[48];
-    if (!fgets(pem_buf, sizeof(pem_buf), pf)) break;
-    if (writing) {
-      if (strstr(pem_buf, "-----END ") != NULL) {
-        ret = true;
-        break;
-      }
-      int l = 0;
-      while (!isspace((unsigned int) pem_buf[l])) l++;
-      int der_len = 0;
-      cs_base64_decode((const unsigned char *) pem_buf, sizeof(pem_buf),
-                       der_buf, &der_len);
-      if (der_len <= 0) break;
-      if (fwrite(der_buf, 1, der_len, df) != der_len) break;
-    } else if (strstr(pem_buf, "-----BEGIN ") != NULL) {
-      writing = true;
+struct mg_str mg_strdup(const struct mg_str s) {
+  struct mg_str r = {NULL, 0};
+  if (s.len > 0 && s.ptr != NULL) {
+    char *sc = (char *) calloc(1, s.len + 1);
+    if (sc != NULL) {
+      memcpy(sc, s.ptr, s.len);
+      sc[s.len] = '\0';
+      r.ptr = sc;
+      r.len = s.len;
     }
   }
-
-clean:
-  if (pf != NULL) fclose(pf);
-  if (df != NULL) {
-    fclose(df);
-    if (!ret) remove(der_file);
-  }
-  return ret;
+  return r;
 }
 
-#if MG_ENABLE_FILESYSTEM && defined(MG_FS_SLFS)
-/* If the file's extension is .pem, convert it to DER format and put on SLFS. */
-static char *sl_pem2der(const char *pem_file) {
-  const char *pem_ext = strstr(pem_file, ".pem");
-  if (pem_ext == NULL || *(pem_ext + 4) != '\0') {
-    return strdup(pem_file);
-  }
-  char *der_file = NULL;
-  /* DER file must be located on SLFS, add prefix. */
-  int l = mg_asprintf(&der_file, 0, MG_SSL_IF_SIMPLELINK_SLFS_PREFIX "%.*s.der",
-                      (int) (pem_ext - pem_file), pem_file);
-  if (der_file == NULL) return NULL;
-  bool result = false;
-  cs_stat_t st;
-  if (mg_stat(der_file, &st) != 0) {
-    result = pem_to_der(pem_file, der_file);
-    LOG(LL_DEBUG, ("%s -> %s = %d", pem_file, der_file, result));
-  } else {
-    /* File exists, assume it's already been converted. */
-    result = true;
-  }
-  if (result) {
-    /* Strip the SL: prefix we added since NWP does not expect it. */
-    memmove(der_file, der_file + MG_SSL_IF_SIMPLELINK_SLFS_PREFIX_LEN,
-            l - 2 /* including \0 */);
-  } else {
-    MG_FREE(der_file);
-    der_file = NULL;
+int mg_strcmp(const struct mg_str str1, const struct mg_str str2) {
+  size_t i = 0;
+  while (i < str1.len && i < str2.len) {
+    int c1 = str1.ptr[i];
+    int c2 = str2.ptr[i];
+    if (c1 < c2) return -1;
+    if (c1 > c2) return 1;
+    i++;
   }
-  return der_file;
-}
-#else
-static char *sl_pem2der(const char *pem_file) {
-  return strdup(pem_file);
+  if (i < str1.len) return 1;
+  if (i < str2.len) return -1;
+  return 0;
 }
-#endif
 
-int sl_set_ssl_opts(int sock, struct mg_connection *nc) {
-  int err;
-  const struct mg_ssl_if_ctx *ctx = (struct mg_ssl_if_ctx *) nc->ssl_if_data;
-  DBG(("%p ssl ctx: %p", nc, ctx));
-
-  if (ctx == NULL) return 0;
-  DBG(("%p %s,%s,%s,%s", nc, (ctx->ssl_cert ? ctx->ssl_cert : "-"),
-       (ctx->ssl_key ? ctx->ssl_cert : "-"),
-       (ctx->ssl_ca_cert ? ctx->ssl_ca_cert : "-"),
-       (ctx->ssl_server_name ? ctx->ssl_server_name : "-")));
-  if (ctx->ssl_cert != NULL && ctx->ssl_key != NULL) {
-    char *ssl_cert = sl_pem2der(ctx->ssl_cert), *ssl_key = NULL;
-    if (ssl_cert != NULL) {
-      err = sl_SetSockOpt(sock, SL_SOL_SOCKET,
-                          SL_SO_SECURE_FILES_CERTIFICATE_FILE_NAME, ssl_cert,
-                          strlen(ssl_cert));
-      MG_FREE(ssl_cert);
-      LOG(LL_DEBUG, ("CERTIFICATE_FILE_NAME %s -> %d", ssl_cert, err));
-      ssl_key = sl_pem2der(ctx->ssl_key);
-      if (ssl_key != NULL) {
-        err = sl_SetSockOpt(sock, SL_SOL_SOCKET,
-                            SL_SO_SECURE_FILES_PRIVATE_KEY_FILE_NAME, ssl_key,
-                            strlen(ssl_key));
-        MG_FREE(ssl_key);
-        LOG(LL_DEBUG, ("PRIVATE_KEY_FILE_NAME %s -> %d", ssl_key, err));
-      } else {
-        err = -1;
-      }
-    } else {
-      err = -1;
-    }
-    if (err != 0) return err;
-  }
-  if (ctx->ssl_ca_cert != NULL) {
-    if (ctx->ssl_ca_cert[0] != '\0') {
-      char *ssl_ca_cert = sl_pem2der(ctx->ssl_ca_cert);
-      if (ssl_ca_cert != NULL) {
-        err =
-            sl_SetSockOpt(sock, SL_SOL_SOCKET, SL_SO_SECURE_FILES_CA_FILE_NAME,
-                          ssl_ca_cert, strlen(ssl_ca_cert));
-        LOG(LL_DEBUG, ("CA_FILE_NAME %s -> %d", ssl_ca_cert, err));
-      } else {
-        err = -1;
-      }
-      MG_FREE(ssl_ca_cert);
-      if (err != 0) return err;
+const char *mg_strstr(const struct mg_str haystack,
+                      const struct mg_str needle) {
+  size_t i;
+  if (needle.len > haystack.len) return NULL;
+  for (i = 0; i <= haystack.len - needle.len; i++) {
+    if (memcmp(haystack.ptr + i, needle.ptr, needle.len) == 0) {
+      return haystack.ptr + i;
     }
   }
-  if (ctx->ssl_server_name != NULL) {
-    err = sl_SetSockOpt(sock, SL_SOL_SOCKET,
-                        SL_SO_SECURE_DOMAIN_NAME_VERIFICATION,
-                        ctx->ssl_server_name, strlen(ctx->ssl_server_name));
-    DBG(("DOMAIN_NAME_VERIFICATION %s -> %d", ctx->ssl_server_name, err));
-    /* Domain name verificationw as added in a NWP service pack, older
-     * versions return SL_ERROR_BSD_ENOPROTOOPT. There isn't much we can do
-     * about it,
-     * so we ignore the error. */
-    if (err != 0 && err != SL_ERROR_BSD_ENOPROTOOPT) return err;
-  }
-  return 0;
+  return NULL;
 }
 
-#endif /* MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_SIMPLELINK */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/lwip/mg_lwip_net_if.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_LWIP_MG_NET_IF_LWIP_H_
-#define CS_COMMON_PLATFORMS_LWIP_MG_NET_IF_LWIP_H_
-
-#ifndef MG_ENABLE_NET_IF_LWIP_LOW_LEVEL
-#define MG_ENABLE_NET_IF_LWIP_LOW_LEVEL MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL
-#endif
-
-#if MG_ENABLE_NET_IF_LWIP_LOW_LEVEL
-
-#include <stdint.h>
-
-extern const struct mg_iface_vtable mg_lwip_iface_vtable;
-
-struct mg_lwip_conn_state {
-  struct mg_connection *nc;
-  struct mg_connection *lc;
-  union {
-    struct tcp_pcb *tcp;
-    struct udp_pcb *udp;
-  } pcb;
-  err_t err;
-  size_t num_sent; /* Number of acknowledged bytes to be reported to the core */
-  struct pbuf *rx_chain; /* Chain of incoming data segments. */
-  size_t rx_offset; /* Offset within the first pbuf (if partially consumed) */
-  /* Last SSL write size, for retries. */
-  int last_ssl_write_size;
-  /* Whether MG_SIG_RECV is already pending for this connection */
-  int recv_pending;
-  /* Whether the connection is about to close, just `rx_chain` needs to drain */
-  int draining_rx_chain;
-};
-
-enum mg_sig_type {
-  MG_SIG_CONNECT_RESULT = 1,
-  MG_SIG_RECV = 2,
-  MG_SIG_CLOSE_CONN = 3,
-  MG_SIG_TOMBSTONE = 4,
-  MG_SIG_ACCEPT = 5,
-};
-
-void mg_lwip_post_signal(enum mg_sig_type sig, struct mg_connection *nc);
-
-/* To be implemented by the platform. */
-void mg_lwip_mgr_schedule_poll(struct mg_mgr *mgr);
-
-#endif /* MG_ENABLE_NET_IF_LWIP_LOW_LEVEL */
+struct mg_str mg_strstrip(struct mg_str s) {
+  while (s.len > 0 && isspace((int) *s.ptr)) s.ptr++, s.len--;
+  while (s.len > 0 && isspace((int) *(s.ptr + s.len - 1))) s.len--;
+  return s;
+}
 
-#endif /* CS_COMMON_PLATFORMS_LWIP_MG_NET_IF_LWIP_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/lwip/mg_lwip_net_if.c"
+#ifdef MG_ENABLE_LINES
+#line 1 "src/timer.c"
 #endif
+// Copyright (c) Cesanta Software Limited
+// All rights reserved
 
-#if MG_ENABLE_NET_IF_LWIP_LOW_LEVEL
-
-/* Amalgamated: #include "common/mg_mem.h" */
-
-#include <lwip/init.h>
-#include <lwip/pbuf.h>
-#include <lwip/tcp.h>
-#include <lwip/tcpip.h>
-#if ((LWIP_VERSION_MAJOR << 8) | LWIP_VERSION_MINOR) >= 0x0105
-#include <lwip/priv/tcp_priv.h>   /* For tcp_seg */
-#include <lwip/priv/tcpip_priv.h> /* For tcpip_api_call */
-#else
-#include <lwip/tcp_impl.h>
-#endif
-#include <lwip/udp.h>
 
-/* Amalgamated: #include "common/cs_dbg.h" */
 
-/*
- * Newest versions of LWIP have ip_2_ip4, older have ipX_2_ip,
- * even older have nothing.
- */
-#ifndef ip_2_ip4
-#ifdef ipX_2_ip
-#define ip_2_ip4(addr) ipX_2_ip(addr)
-#else
-#define ip_2_ip4(addr) (addr)
-#endif
-#endif
 
-/*
- * Depending on whether Mongoose is compiled with ipv6 support, use right
- * lwip functions
- */
-#if MG_ENABLE_IPV6
-#define TCP_NEW tcp_new_ip6
-#define TCP_BIND tcp_bind_ip6
-#define UDP_BIND udp_bind_ip6
-#define IPADDR_NTOA(x) ip6addr_ntoa((const ip6_addr_t *)(x))
-#define SET_ADDR(dst, src)                               \
-  memcpy((dst)->sin6.sin6_addr.s6_addr, (src)->ip6.addr, \
-         sizeof((dst)->sin6.sin6_addr.s6_addr))
-#else
-#define TCP_NEW tcp_new
-#define TCP_BIND tcp_bind
-#define UDP_BIND udp_bind
-#define IPADDR_NTOA ipaddr_ntoa
-#define SET_ADDR(dst, src) (dst)->sin.sin_addr.s_addr = ip_2_ip4(src)->addr
-#endif
+struct mg_timer *g_timers;
 
-#if !NO_SYS
-#if LWIP_TCPIP_CORE_LOCKING
-/* With locking tcpip_api_call is just a function call wrapped in lock/unlock,
- * so we can get away with just casting. */
-void mg_lwip_netif_run_on_tcpip(void (*fn)(void *), void *arg) {
-  tcpip_api_call((tcpip_api_call_fn) fn, (struct tcpip_api_call_data *) arg);
+void mg_timer_init(struct mg_timer *t, int64_t ms, unsigned flags,
+                   void (*fn)(void *), void *arg) {
+  struct mg_timer tmp = {ms, 0UL, flags, fn, arg, g_timers};
+  *t = tmp;
+  g_timers = t;
+  if (flags & MG_TIMER_RUN_NOW) fn(arg);
 }
-#else
-static sys_sem_t s_tcpip_call_lock_sem = NULL;
-static sys_sem_t s_tcpip_call_sync_sem = NULL;
-struct mg_lwip_netif_tcpip_call_ctx {
-  void (*fn)(void *);
-  void *arg;
-};
-static void xxx_tcpip(void *arg) {
-  struct mg_lwip_netif_tcpip_call_ctx *ctx =
-      (struct mg_lwip_netif_tcpip_call_ctx *) arg;
-  ctx->fn(ctx->arg);
-  sys_sem_signal(&s_tcpip_call_sync_sem);
-}
-void mg_lwip_netif_run_on_tcpip(void (*fn)(void *), void *arg) {
-  struct mg_lwip_netif_tcpip_call_ctx ctx = {.fn = fn, .arg = arg};
-  sys_arch_sem_wait(&s_tcpip_call_lock_sem, 0);
-  tcpip_send_msg_wait_sem(xxx_tcpip, &ctx, &s_tcpip_call_sync_sem);
-  sys_sem_signal(&s_tcpip_call_lock_sem);
-}
-#endif
-#else
-#define mg_lwip_netif_run_on_tcpip(fn, arg) (fn)(arg)
-#endif
-
-void mg_lwip_if_init(struct mg_iface *iface);
-void mg_lwip_if_free(struct mg_iface *iface);
-void mg_lwip_if_add_conn(struct mg_connection *nc);
-void mg_lwip_if_remove_conn(struct mg_connection *nc);
-time_t mg_lwip_if_poll(struct mg_iface *iface, int timeout_ms);
-
-// If compiling for Mongoose OS.
-#ifdef MGOS
-extern void mgos_lock();
-extern void mgos_unlock();
-#else
-#define mgos_lock()
-#define mgos_unlock()
-#endif
 
-static void mg_lwip_recv_common(struct mg_connection *nc, struct pbuf *p);
-
-#if LWIP_TCP_KEEPALIVE
-void mg_lwip_set_keepalive_params(struct mg_connection *nc, int idle,
-                                  int interval, int count) {
-  if (nc->sock == INVALID_SOCKET || nc->flags & MG_F_UDP) {
-    return;
-  }
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  struct tcp_pcb *tpcb = cs->pcb.tcp;
-  if (idle > 0 && interval > 0 && count > 0) {
-    tpcb->keep_idle = idle * 1000;
-    tpcb->keep_intvl = interval * 1000;
-    tpcb->keep_cnt = count;
-    tpcb->so_options |= SOF_KEEPALIVE;
-  } else {
-    tpcb->so_options &= ~SOF_KEEPALIVE;
-  }
+void mg_timer_free(struct mg_timer *t) {
+  struct mg_timer **head = &g_timers;
+  while (*head && *head != t) head = &(*head)->next;
+  if (*head) *head = t->next;
 }
-#elif !defined(MG_NO_LWIP_TCP_KEEPALIVE)
-#warning LWIP TCP keepalive is disabled. Please consider enabling it.
-#endif /* LWIP_TCP_KEEPALIVE */
 
-static err_t mg_lwip_tcp_conn_cb(void *arg, struct tcp_pcb *tpcb, err_t err) {
-  struct mg_connection *nc = (struct mg_connection *) arg;
-  DBG(("%p connect to %s:%u = %d", nc, IPADDR_NTOA(ipX_2_ip(&tpcb->remote_ip)),
-       tpcb->remote_port, err));
-  if (nc == NULL) {
-    tcp_abort(tpcb);
-    return ERR_ARG;
-  }
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  cs->err = err;
-#if LWIP_TCP_KEEPALIVE
-  if (err == 0) mg_lwip_set_keepalive_params(nc, 60, 10, 6);
-#endif
-  mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
-  return ERR_OK;
-}
-
-static void mg_lwip_tcp_error_cb(void *arg, err_t err) {
-  struct mg_connection *nc = (struct mg_connection *) arg;
-  DBG(("%p conn error %d", nc, err));
-  if (nc == NULL || (nc->flags & MG_F_CLOSE_IMMEDIATELY)) return;
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  cs->pcb.tcp = NULL; /* Has already been deallocated */
-  if (nc->flags & MG_F_CONNECTING) {
-    cs->err = err;
-    mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
-  } else {
-    mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
-  }
-}
-
-static err_t mg_lwip_tcp_recv_cb(void *arg, struct tcp_pcb *tpcb,
-                                 struct pbuf *p, err_t err) {
-  struct mg_connection *nc = (struct mg_connection *) arg;
-  struct mg_lwip_conn_state *cs =
-      (nc ? (struct mg_lwip_conn_state *) nc->sock : NULL);
-  DBG(("%p %p %p %p %u %d", nc, cs, tpcb, p, (p != NULL ? p->tot_len : 0),
-       err));
-  if (p == NULL) {
-    if (nc != NULL && !(nc->flags & MG_F_CLOSE_IMMEDIATELY)) {
-      if (cs->rx_chain != NULL) {
-        /*
-         * rx_chain still contains non-consumed data, don't close the
-         * connection
-         */
-        cs->draining_rx_chain = 1;
-      } else {
-        mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
-      }
-    } else {
-      /* Tombstoned connection, do nothing. */
-    }
-    return ERR_OK;
-  } else if (nc == NULL) {
-    tcp_abort(tpcb);
-    return ERR_ARG;
-  }
-  /*
-   * If we get a chain of more than one segment at once, we need to bump
-   * refcount on the subsequent bufs to make them independent.
-   */
-  if (p->next != NULL) {
-    struct pbuf *q = p->next;
-    for (; q != NULL; q = q->next) pbuf_ref(q);
-  }
-  mgos_lock();
-  if (cs->rx_chain == NULL) {
-    cs->rx_offset = 0;
-  } else if (pbuf_clen(cs->rx_chain) >= 4) {
-    /* ESP SDK has a limited pool of 5 pbufs. We must not hog them all or RX
-     * will be completely blocked. We already have at least 4 in the chain,
-     * this one is the last, so we have to make a copy and release this one. */
-    struct pbuf *np = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
-    if (np != NULL) {
-      pbuf_copy(np, p);
-      pbuf_free(p);
-      p = np;
-    }
+void mg_timer_poll(int64_t now_ms) {
+  // If time goes back (wrapped around), reset timers
+  struct mg_timer *t, *tmp;
+  static int64_t oldnow;  // Timestamp in a previous invocation
+  if (oldnow > now_ms) {  // If it is wrapped, reset timers
+    for (t = g_timers; t != NULL; t = t->next) t->expire = 0;
   }
-  mg_lwip_recv_common(nc, p);
-  mgos_unlock();
-  (void) err;
-  return ERR_OK;
-}
+  oldnow = now_ms;
 
-static err_t mg_lwip_tcp_sent_cb(void *arg, struct tcp_pcb *tpcb,
-                                 u16_t num_sent) {
-  struct mg_connection *nc = (struct mg_connection *) arg;
-  DBG(("%p %p %u %p %p", nc, tpcb, num_sent, tpcb->unsent, tpcb->unacked));
-  if (nc == NULL) return ERR_OK;
-  if ((nc->flags & MG_F_SEND_AND_CLOSE) && !(nc->flags & MG_F_WANT_WRITE) &&
-      nc->send_mbuf.len == 0 && tpcb->unsent == NULL && tpcb->unacked == NULL) {
-    mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
-  }
-  if (nc->send_mbuf.len > 0 || (nc->flags & MG_F_WANT_WRITE)) {
-    mg_lwip_mgr_schedule_poll(nc->mgr);
+  for (t = g_timers; t != NULL; t = tmp) {
+    tmp = t->next;
+    if (t->expire == 0) t->expire = now_ms + t->period_ms;
+    if (t->expire > now_ms) continue;
+    t->fn(t->arg);
+    // Try to tick timers with the given period as accurate as possible,
+    // even if this polling function is called with some random period.
+    t->expire = now_ms - t->expire > t->period_ms ? now_ms + t->period_ms
+                                                  : t->expire + t->period_ms;
+    if (!(t->flags & MG_TIMER_REPEAT)) mg_timer_free(t);
   }
-  (void) num_sent;
-  return ERR_OK;
 }
 
-struct mg_lwip_if_connect_tcp_ctx {
-  struct mg_connection *nc;
-  const union socket_address *sa;
-};
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tls_dummy.c"
+#endif
 
-static void mg_lwip_if_connect_tcp_tcpip(void *arg) {
-  struct mg_lwip_if_connect_tcp_ctx *ctx =
-      (struct mg_lwip_if_connect_tcp_ctx *) arg;
-  struct mg_connection *nc = ctx->nc;
-  const union socket_address *sa = ctx->sa;
-
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  struct tcp_pcb *tpcb = TCP_NEW();
-  cs->pcb.tcp = tpcb;
-  ip_addr_t *ip = (ip_addr_t *) &sa->sin.sin_addr.s_addr;
-  u16_t port = ntohs(sa->sin.sin_port);
-  tcp_arg(tpcb, nc);
-  tcp_err(tpcb, mg_lwip_tcp_error_cb);
-  tcp_sent(tpcb, mg_lwip_tcp_sent_cb);
-  tcp_recv(tpcb, mg_lwip_tcp_recv_cb);
-  cs->err = TCP_BIND(tpcb, IP_ADDR_ANY, 0 /* any port */);
-  DBG(("%p tcp_bind = %d", nc, cs->err));
-  if (cs->err != ERR_OK) {
-    mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
-    return;
-  }
-  cs->err = tcp_connect(tpcb, ip, port, mg_lwip_tcp_conn_cb);
-  DBG(("%p tcp_connect %p = %d", nc, tpcb, cs->err));
-  if (cs->err != ERR_OK) {
-    mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
-    return;
-  }
-}
-
-void mg_lwip_if_connect_tcp(struct mg_connection *nc,
-                            const union socket_address *sa) {
-  struct mg_lwip_if_connect_tcp_ctx ctx = {.nc = nc, .sa = sa};
-  mg_lwip_netif_run_on_tcpip(mg_lwip_if_connect_tcp_tcpip, &ctx);
-}
 
-/*
- * Lwip included in the SDKs for nRF5x chips has different type for the
- * callback of `udp_recv()`
- */
-#if ((LWIP_VERSION_MAJOR << 8) | LWIP_VERSION_MINOR) >= 0x0105
-static void mg_lwip_udp_recv_cb(void *arg, struct udp_pcb *pcb, struct pbuf *p,
-                                const ip_addr_t *addr, u16_t port)
-#else
-static void mg_lwip_udp_recv_cb(void *arg, struct udp_pcb *pcb, struct pbuf *p,
-                                ip_addr_t *addr, u16_t port)
-#endif
-{
-  struct mg_connection *nc = (struct mg_connection *) arg;
-  DBG(("%p %s:%u %p %u %u", nc, IPADDR_NTOA(addr), port, p, p->ref, p->len));
-  /* Put address in a separate pbuf and tack it onto the packet. */
-  struct pbuf *sap =
-      pbuf_alloc(PBUF_RAW, sizeof(union socket_address), PBUF_RAM);
-  if (sap == NULL) {
-    pbuf_free(p);
-    return;
-  }
-  union socket_address *sa = (union socket_address *) sap->payload;
-#if ((LWIP_VERSION_MAJOR << 8) | LWIP_VERSION_MINOR) >= 0x0105
-  sa->sin.sin_addr.s_addr = ip_2_ip4(addr)->addr;
-#else
-  sa->sin.sin_addr.s_addr = addr->addr;
-#endif
-  sa->sin.sin_port = htons(port);
-  /* Logic in the recv handler requires that there be exactly one data pbuf. */
-  p = pbuf_coalesce(p, PBUF_RAW);
-  pbuf_chain(sap, p);
-  mgos_lock();
-  mg_lwip_recv_common(nc, sap);
-  mgos_unlock();
-  (void) pcb;
-}
-
-static void mg_lwip_recv_common(struct mg_connection *nc, struct pbuf *p) {
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  if (cs->rx_chain == NULL) {
-    cs->rx_chain = p;
-  } else {
-    pbuf_chain(cs->rx_chain, p);
-  }
-  if (!cs->recv_pending) {
-    cs->recv_pending = 1;
-    mg_lwip_post_signal(MG_SIG_RECV, nc);
-  }
-}
-
-static int mg_lwip_if_udp_recv(struct mg_connection *nc, void *buf, size_t len,
-                               union socket_address *sa, size_t *sa_len) {
-  /*
-   * For UDP, RX chain consists of interleaved address and packet bufs:
-   * Address pbuf followed by exactly one data pbuf (recv_cb took care of that).
-   */
-  int res = 0;
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  if (nc->sock == INVALID_SOCKET) return -1;
-  mgos_lock();
-  if (cs->rx_chain != NULL) {
-    struct pbuf *ap = cs->rx_chain;
-    struct pbuf *dp = ap->next;
-    cs->rx_chain = pbuf_dechain(dp);
-    res = MIN(dp->len, len);
-    pbuf_copy_partial(dp, buf, res, 0);
-    pbuf_free(dp);
-    pbuf_copy_partial(ap, sa, MIN(*sa_len, ap->len), 0);
-    pbuf_free(ap);
-  }
-  mgos_unlock();
-  return res;
+#if !MG_ENABLE_MBEDTLS && !MG_ENABLE_OPENSSL && !MG_ENABLE_CUSTOM_TLS
+void mg_tls_init(struct mg_connection *c, struct mg_tls_opts *opts) {
+  (void) opts;
+  mg_error(c, "TLS is not enabled");
 }
-
-static void mg_lwip_if_connect_udp_tcpip(void *arg) {
-  struct mg_connection *nc = (struct mg_connection *) arg;
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  struct udp_pcb *upcb = udp_new();
-  cs->err = UDP_BIND(upcb, IP_ADDR_ANY, 0 /* any port */);
-  DBG(("%p udp_bind %p = %d", nc, upcb, cs->err));
-  if (cs->err == ERR_OK) {
-    udp_recv(upcb, mg_lwip_udp_recv_cb, nc);
-    cs->pcb.udp = upcb;
-  } else {
-    udp_remove(upcb);
-  }
-  mg_lwip_post_signal(MG_SIG_CONNECT_RESULT, nc);
+void mg_tls_handshake(struct mg_connection *c) {
+  (void) c;
 }
-
-void mg_lwip_if_connect_udp(struct mg_connection *nc) {
-  mg_lwip_netif_run_on_tcpip(mg_lwip_if_connect_udp_tcpip, nc);
+void mg_tls_free(struct mg_connection *c) {
+  (void) c;
 }
-
-static void tcp_close_tcpip(void *arg) {
-  tcp_close((struct tcp_pcb *) arg);
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  return c == NULL || buf == NULL || len == 0 ? 0 : -1;
 }
-
-void mg_lwip_handle_accept(struct mg_connection *nc) {
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  if (cs->pcb.tcp == NULL) return;
-  union socket_address sa;
-  struct tcp_pcb *tpcb = cs->pcb.tcp;
-  SET_ADDR(&sa, &tpcb->remote_ip);
-  sa.sin.sin_port = htons(tpcb->remote_port);
-  mg_if_accept_tcp_cb(nc, &sa, sizeof(sa.sin));
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  return c == NULL || buf == NULL || len == 0 ? 0 : -1;
 }
-
-static err_t mg_lwip_accept_cb(void *arg, struct tcp_pcb *newtpcb, err_t err) {
-  struct mg_connection *lc = (struct mg_connection *) arg, *nc;
-  struct mg_lwip_conn_state *lcs, *cs;
-  struct tcp_pcb_listen *lpcb;
-  LOG(LL_DEBUG,
-      ("%p conn %p from %s:%u", lc, newtpcb,
-       IPADDR_NTOA(ipX_2_ip(&newtpcb->remote_ip)), newtpcb->remote_port));
-  if (lc == NULL) {
-    tcp_abort(newtpcb);
-    return ERR_ABRT;
-  }
-  lcs = (struct mg_lwip_conn_state *) lc->sock;
-  lpcb = (struct tcp_pcb_listen *) lcs->pcb.tcp;
-#if TCP_LISTEN_BACKLOG
-  tcp_accepted(lpcb);
 #endif
-  nc = mg_if_accept_new_conn(lc);
-  if (nc == NULL) {
-    tcp_abort(newtpcb);
-    return ERR_ABRT;
-  }
-  cs = (struct mg_lwip_conn_state *) nc->sock;
-  cs->lc = lc;
-  cs->pcb.tcp = newtpcb;
-  /* We need to set up callbacks before returning because data may start
-   * arriving immediately. */
-  tcp_arg(newtpcb, nc);
-  tcp_err(newtpcb, mg_lwip_tcp_error_cb);
-  tcp_sent(newtpcb, mg_lwip_tcp_sent_cb);
-  tcp_recv(newtpcb, mg_lwip_tcp_recv_cb);
-#if LWIP_TCP_KEEPALIVE
-  mg_lwip_set_keepalive_params(nc, 60, 10, 6);
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tls_mbed.c"
 #endif
-  mg_lwip_post_signal(MG_SIG_ACCEPT, nc);
-  (void) err;
-  (void) lpcb;
-  return ERR_OK;
-}
 
-struct mg_lwip_if_listen_ctx {
-  struct mg_connection *nc;
-  union socket_address *sa;
-  int ret;
-};
 
-static void mg_lwip_if_listen_tcp_tcpip(void *arg) {
-  struct mg_lwip_if_listen_ctx *ctx = (struct mg_lwip_if_listen_ctx *) arg;
-  struct mg_connection *nc = ctx->nc;
-  union socket_address *sa = ctx->sa;
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  struct tcp_pcb *tpcb = TCP_NEW();
-  ip_addr_t *ip = (ip_addr_t *) &sa->sin.sin_addr.s_addr;
-  u16_t port = ntohs(sa->sin.sin_port);
-  cs->err = TCP_BIND(tpcb, ip, port);
-  DBG(("%p tcp_bind(%s:%u) = %d", nc, IPADDR_NTOA(ip), port, cs->err));
-  if (cs->err != ERR_OK) {
-    tcp_close(tpcb);
-    ctx->ret = -1;
-    return;
-  }
-  tcp_arg(tpcb, nc);
-  tpcb = tcp_listen(tpcb);
-  cs->pcb.tcp = tpcb;
-  tcp_accept(tpcb, mg_lwip_accept_cb);
-  ctx->ret = 0;
-}
-
-int mg_lwip_if_listen_tcp(struct mg_connection *nc, union socket_address *sa) {
-  struct mg_lwip_if_listen_ctx ctx = {.nc = nc, .sa = sa};
-  mg_lwip_netif_run_on_tcpip(mg_lwip_if_listen_tcp_tcpip, &ctx);
-  return ctx.ret;
-}
-
-static void mg_lwip_if_listen_udp_tcpip(void *arg) {
-  struct mg_lwip_if_listen_ctx *ctx = (struct mg_lwip_if_listen_ctx *) arg;
-  struct mg_connection *nc = ctx->nc;
-  union socket_address *sa = ctx->sa;
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  struct udp_pcb *upcb = udp_new();
-  ip_addr_t *ip = (ip_addr_t *) &sa->sin.sin_addr.s_addr;
-  u16_t port = ntohs(sa->sin.sin_port);
-  cs->err = UDP_BIND(upcb, ip, port);
-  DBG(("%p udb_bind(%s:%u) = %d", nc, IPADDR_NTOA(ip), port, cs->err));
-  if (cs->err != ERR_OK) {
-    udp_remove(upcb);
-    ctx->ret = -1;
-  } else {
-    udp_recv(upcb, mg_lwip_udp_recv_cb, nc);
-    cs->pcb.udp = upcb;
-    ctx->ret = 0;
+
+#if MG_ENABLE_MBEDTLS
+
+#if defined(MBEDTLS_VERSION_NUMBER) && MBEDTLS_VERSION_NUMBER >= 0x03000000
+#define MGRNG , rng_get, NULL
+#else
+#define MGRNG
+#endif
+
+void mg_tls_free(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  if (tls != NULL) {
+    free(tls->cafile);
+    mbedtls_ssl_free(&tls->ssl);
+    mbedtls_pk_free(&tls->pk);
+    mbedtls_x509_crt_free(&tls->ca);
+    mbedtls_x509_crl_free(&tls->crl);
+    mbedtls_x509_crt_free(&tls->cert);
+    mbedtls_ssl_config_free(&tls->conf);
+    free(tls);
+    c->tls = NULL;
   }
 }
 
-int mg_lwip_if_listen_udp(struct mg_connection *nc, union socket_address *sa) {
-  struct mg_lwip_if_listen_ctx ctx = {.nc = nc, .sa = sa};
-  mg_lwip_netif_run_on_tcpip(mg_lwip_if_listen_udp_tcpip, &ctx);
-  return ctx.ret;
+static bool mg_wouldblock(int n) {
+  return n < 0 &&
+         (errno == EINPROGRESS || errno == EAGAIN || errno == EWOULDBLOCK);
 }
 
-struct mg_lwip_tcp_write_ctx {
-  struct mg_connection *nc;
-  const void *data;
-  uint16_t len;
-  int ret;
-};
-
-static void tcp_output_tcpip(void *arg) {
-  tcp_output((struct tcp_pcb *) arg);
-}
-
-static void mg_lwip_tcp_write_tcpip(void *arg) {
-  struct mg_lwip_tcp_write_ctx *ctx = (struct mg_lwip_tcp_write_ctx *) arg;
-  struct mg_connection *nc = ctx->nc;
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  struct tcp_pcb *tpcb = cs->pcb.tcp;
-  size_t len = MIN(tpcb->mss, MIN(ctx->len, tpcb->snd_buf));
-  size_t unsent, unacked;
-  if (len == 0) {
-    DBG(("%p no buf avail %u %u %p %p", tpcb, tpcb->snd_buf, tpcb->snd_queuelen,
-         tpcb->unsent, tpcb->unacked));
-    mg_lwip_netif_run_on_tcpip(tcp_output_tcpip, tpcb);
-    ctx->ret = 0;
-    return;
-  }
-  unsent = (tpcb->unsent != NULL ? tpcb->unsent->len : 0);
-  unacked = (tpcb->unacked != NULL ? tpcb->unacked->len : 0);
-/*
- * On ESP8266 we only allow one TCP segment in flight at any given time.
- * This may increase latency and reduce efficiency of tcp windowing,
- * but memory is scarce and precious on that platform so we do this to
- * reduce footprint.
- */
-#if CS_PLATFORM == CS_P_ESP8266
-  if (unacked > 0) {
-    ctx->ret = 0;
-    return;
-  }
-  len = MIN(len, (TCP_MSS - unsent));
-#endif
-  cs->err = tcp_write(tpcb, ctx->data, len, TCP_WRITE_FLAG_COPY);
-  unsent = (tpcb->unsent != NULL ? tpcb->unsent->len : 0);
-  unacked = (tpcb->unacked != NULL ? tpcb->unacked->len : 0);
-  DBG(("%p tcp_write %u = %d, %u %u", tpcb, len, cs->err, unsent, unacked));
-  if (cs->err != ERR_OK) {
-    /*
-     * We ignore ERR_MEM because memory will be freed up when the data is sent
-     * and we'll retry.
-     */
-    ctx->ret = (cs->err == ERR_MEM ? 0 : -1);
-    return;
-  }
-  ctx->ret = len;
-  (void) unsent;
-  (void) unacked;
-}
-
-int mg_lwip_if_tcp_send(struct mg_connection *nc, const void *buf, size_t len) {
-  struct mg_lwip_tcp_write_ctx ctx = {.nc = nc, .data = buf, .len = len};
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  if (nc->sock == INVALID_SOCKET) return -1;
-  struct tcp_pcb *tpcb = cs->pcb.tcp;
-  if (tpcb == NULL) return -1;
-  if (tpcb->snd_buf <= 0) return 0;
-  mg_lwip_netif_run_on_tcpip(mg_lwip_tcp_write_tcpip, &ctx);
-  return ctx.ret;
-}
-
-struct udp_sendto_ctx {
-  struct udp_pcb *upcb;
-  struct pbuf *p;
-  ip_addr_t *ip;
-  uint16_t port;
-  int ret;
-};
+static int mg_net_send(void *ctx, const unsigned char *buf, size_t len) {
+  int fd = *(int *) ctx;
+  int n = (int) send(fd, buf, len, 0);
+  if (n > 0) return n;
+  if (mg_wouldblock(n)) return MBEDTLS_ERR_SSL_WANT_WRITE;
+  return MBEDTLS_ERR_NET_SEND_FAILED;
+}
 
-static void udp_sendto_tcpip(void *arg) {
-  struct udp_sendto_ctx *ctx = (struct udp_sendto_ctx *) arg;
-  ctx->ret = udp_sendto(ctx->upcb, ctx->p, ctx->ip, ctx->port);
+static int mg_net_recv(void *ctx, unsigned char *buf, size_t len) {
+  int fd = *(int *) ctx;
+  int n = (int) recv(fd, buf, len, 0);
+  if (n > 0) return n;
+  if (mg_wouldblock(n)) return MBEDTLS_ERR_SSL_WANT_READ;
+  return MBEDTLS_ERR_NET_RECV_FAILED;
 }
 
-static int mg_lwip_if_udp_send(struct mg_connection *nc, const void *data,
-                               size_t len) {
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  if (nc->sock == INVALID_SOCKET || cs->pcb.udp == NULL) return -1;
-  struct udp_pcb *upcb = cs->pcb.udp;
-  struct pbuf *p = pbuf_alloc(PBUF_TRANSPORT, len, PBUF_RAM);
-#if defined(LWIP_IPV4) && LWIP_IPV4 && defined(LWIP_IPV6) && LWIP_IPV6
-  ip_addr_t ip = {.u_addr.ip4.addr = nc->sa.sin.sin_addr.s_addr, .type = 0};
-#else
-  ip_addr_t ip = {.addr = nc->sa.sin.sin_addr.s_addr};
-#endif
-  u16_t port = ntohs(nc->sa.sin.sin_port);
-  if (p == NULL) return 0;
-  memcpy(p->payload, data, len);
-  struct udp_sendto_ctx ctx = {.upcb = upcb, .p = p, .ip = &ip, .port = port};
-  mg_lwip_netif_run_on_tcpip(udp_sendto_tcpip, &ctx);
-  cs->err = ctx.ret;
-  pbuf_free(p);
-  return (cs->err == ERR_OK ? (int) len : -2);
-}
-
-static int mg_lwip_if_can_send(struct mg_connection *nc,
-                               struct mg_lwip_conn_state *cs) {
-  int can_send = 0;
-  if (nc->send_mbuf.len > 0 || (nc->flags & MG_F_WANT_WRITE)) {
-    /* We have stuff to send, but can we? */
-    if (nc->flags & MG_F_UDP) {
-      /* UDP is always ready for sending. */
-      can_send = (cs->pcb.udp != NULL);
-    } else {
-      can_send = (cs->pcb.tcp != NULL && cs->pcb.tcp->snd_buf > 0);
-/* See comment above. */
-#if CS_PLATFORM == CS_P_ESP8266
-      if (cs->pcb.tcp->unacked != NULL) can_send = 0;
-#endif
-    }
+void mg_tls_handshake(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int rc;
+  mbedtls_ssl_set_bio(&tls->ssl, &c->fd, mg_net_send, mg_net_recv, 0);
+  rc = mbedtls_ssl_handshake(&tls->ssl);
+  if (rc == 0) {  // Success
+    LOG(LL_DEBUG, ("%lu success", c->id));
+    c->is_tls_hs = 0;
+  } else if (rc == MBEDTLS_ERR_SSL_WANT_READ ||
+             rc == MBEDTLS_ERR_SSL_WANT_WRITE) {  // Still pending
+    LOG(LL_VERBOSE_DEBUG, ("%lu pending, %d%d %d (-%#x)", c->id,
+                           c->is_connecting, c->is_tls_hs, rc, -rc));
+  } else {
+    mg_error(c, "TLS handshake: -%#x", -rc);  // Error
   }
-  return can_send;
 }
 
-struct tcp_recved_ctx {
-  struct tcp_pcb *tpcb;
-  size_t len;
-};
-
-void tcp_recved_tcpip(void *arg) {
-  struct tcp_recved_ctx *ctx = (struct tcp_recved_ctx *) arg;
-  if (ctx->tpcb != NULL) tcp_recved(ctx->tpcb, ctx->len);
-}
-
-static int mg_lwip_if_tcp_recv(struct mg_connection *nc, void *buf,
-                               size_t len) {
-  int res = 0;
-  char *bufp = buf;
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  if (nc->sock == INVALID_SOCKET) return -1;
-  mgos_lock();
-  while (cs->rx_chain != NULL && len > 0) {
-    struct pbuf *seg = cs->rx_chain;
-    size_t seg_len = (seg->len - cs->rx_offset);
-    size_t copy_len = MIN(len, seg_len);
-
-    pbuf_copy_partial(seg, bufp, copy_len, cs->rx_offset);
-    len -= copy_len;
-    res += copy_len;
-    bufp += copy_len;
-    cs->rx_offset += copy_len;
-    if (cs->rx_offset == cs->rx_chain->len) {
-      cs->rx_chain = pbuf_dechain(cs->rx_chain);
-      pbuf_free(seg);
-      cs->rx_offset = 0;
-    }
-  }
-  mgos_unlock();
-  if (res > 0) {
-    struct tcp_recved_ctx ctx = {.tpcb = cs->pcb.tcp, .len = res};
-    mg_lwip_netif_run_on_tcpip(tcp_recved_tcpip, &ctx);
-  }
-  return res;
+static int mbed_rng(void *ctx, unsigned char *buf, size_t len) {
+  mg_random(buf, len);
+  (void) ctx;
+  return 0;
 }
 
-int mg_lwip_if_create_conn(struct mg_connection *nc) {
-  struct mg_lwip_conn_state *cs =
-      (struct mg_lwip_conn_state *) MG_CALLOC(1, sizeof(*cs));
-  if (cs == NULL) return 0;
-  cs->nc = nc;
-  nc->sock = (intptr_t) cs;
-  return 1;
+static void debug_cb(void *c, int lev, const char *s, int n, const char *s2) {
+  n = (int) strlen(s2) - 1;
+  LOG(LL_VERBOSE_DEBUG, ("%p %.*s", ((struct mg_connection *) c)->fd, n, s2));
+  (void) s;
+  (void) c;
+  (void) lev;
 }
 
-static void udp_remove_tcpip(void *arg) {
-  udp_remove((struct udp_pcb *) arg);
+#if defined(MBEDTLS_VERSION_NUMBER) && MBEDTLS_VERSION_NUMBER >= 0x03000000
+static int rng_get(void *p_rng, unsigned char *buf, size_t len) {
+  (void) p_rng;
+  mg_random(buf, len);
+  return 0;
 }
+#endif
 
-void mg_lwip_if_destroy_conn(struct mg_connection *nc) {
-  if (nc->sock == INVALID_SOCKET) return;
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  if (!(nc->flags & MG_F_UDP)) {
-    struct tcp_pcb *tpcb = cs->pcb.tcp;
-    if (tpcb != NULL) {
-      tcp_arg(tpcb, NULL);
-      DBG(("%p tcp_close %p", nc, tpcb));
-      tcp_arg(tpcb, NULL);
-      mg_lwip_netif_run_on_tcpip(tcp_close_tcpip, tpcb);
+static struct mg_str mg_loadfile(struct mg_fs *fs, const char *path) {
+  size_t n = 0;
+  if (path[0] == '-') return mg_str(path);
+  char *p = mg_file_read(fs, path, &n);
+  return mg_str_n(p, n);
+}
+
+void mg_tls_init(struct mg_connection *c, struct mg_tls_opts *opts) {
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct mg_tls *tls = (struct mg_tls *) calloc(1, sizeof(*tls));
+  int rc = 0;
+  c->tls = tls;
+  if (c->tls == NULL) {
+    mg_error(c, "TLS OOM");
+    goto fail;
+  }
+  LOG(LL_DEBUG, ("%lu Setting TLS", c->id));
+  mbedtls_ssl_init(&tls->ssl);
+  mbedtls_ssl_config_init(&tls->conf);
+  mbedtls_x509_crt_init(&tls->ca);
+  mbedtls_x509_crl_init(&tls->crl);
+  mbedtls_x509_crt_init(&tls->cert);
+  mbedtls_pk_init(&tls->pk);
+  mbedtls_ssl_conf_dbg(&tls->conf, debug_cb, c);
+  if ((rc = mbedtls_ssl_config_defaults(
+           &tls->conf,
+           c->is_client ? MBEDTLS_SSL_IS_CLIENT : MBEDTLS_SSL_IS_SERVER,
+           MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
+    mg_error(c, "tls defaults %#x", -rc);
+    goto fail;
+  }
+  mbedtls_ssl_conf_rng(&tls->conf, mbed_rng, c);
+  if (opts->ca == NULL || strcmp(opts->ca, "*") == 0) {
+    mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_NONE);
+  } else if (opts->ca != NULL && opts->ca[0] != '\0') {
+    if (opts->crl != NULL && opts->crl[0] != '\0') {
+      struct mg_str s = mg_loadfile(fs, opts->crl);
+      rc = mbedtls_x509_crl_parse(&tls->crl, (uint8_t *) s.ptr, s.len + 1);
+      if (opts->crl[0] != '-') free((char *) s.ptr);
+      if (rc != 0) {
+        mg_error(c, "parse(%s) err %#x", opts->crl, -rc);
+        goto fail;
+      }
+    }
+#if defined(MBEDTLS_X509_CA_CHAIN_ON_DISK)
+    tls->cafile = strdup(opts->ca);
+    rc = mbedtls_ssl_conf_ca_chain_file(&tls->conf, tls->cafile, &tls->crl);
+    if (rc != 0) {
+      mg_error(c, "parse on-disk chain(%s) err %#x", ca, -rc);
+      goto fail;
+    }
+#else
+    struct mg_str s = mg_loadfile(fs, opts->ca);
+    rc = mbedtls_x509_crt_parse(&tls->ca, (uint8_t *) s.ptr, s.len + 1);
+    if (opts->ca[0] != '-') free((char *) s.ptr);
+    if (rc != 0) {
+      mg_error(c, "parse(%s) err %#x", opts->ca, -rc);
+      goto fail;
     }
-    while (cs->rx_chain != NULL) {
-      struct pbuf *seg = cs->rx_chain;
-      cs->rx_chain = pbuf_dechain(cs->rx_chain);
-      pbuf_free(seg);
+    mbedtls_ssl_conf_ca_chain(&tls->conf, &tls->ca, &tls->crl);
+#endif
+    if (opts->srvname.len > 0) {
+      char mem[128], *buf = mem;
+      mg_asprintf(&buf, sizeof(mem), "%.*s", (int) opts->srvname.len,
+                  opts->srvname.ptr);
+      mbedtls_ssl_set_hostname(&tls->ssl, buf);
+      if (buf != mem) free(buf);
     }
-    memset(cs, 0, sizeof(*cs));
-    MG_FREE(cs);
-  } else if (nc->listener == NULL) {
-    /* Only close outgoing UDP pcb or listeners. */
-    struct udp_pcb *upcb = cs->pcb.udp;
-    if (upcb != NULL) {
-      DBG(("%p udp_remove %p", nc, upcb));
-      mg_lwip_netif_run_on_tcpip(udp_remove_tcpip, upcb);
+    mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_REQUIRED);
+  }
+  if (opts->cert != NULL && opts->cert[0] != '\0') {
+    struct mg_str s = mg_loadfile(fs, opts->cert);
+    const char *key = opts->certkey == NULL ? opts->cert : opts->certkey;
+    rc = mbedtls_x509_crt_parse(&tls->cert, (uint8_t *) s.ptr, s.len + 1);
+    if (opts->cert[0] != '-') free((char *) s.ptr);
+    if (rc != 0) {
+      mg_error(c, "parse(%s) err %#x", opts->cert, -rc);
+      goto fail;
     }
-    memset(cs, 0, sizeof(*cs));
-    MG_FREE(cs);
-  }
-  nc->sock = INVALID_SOCKET;
-}
-
-void mg_lwip_if_get_conn_addr(struct mg_connection *nc, int remote,
-                              union socket_address *sa) {
-  memset(sa, 0, sizeof(*sa));
-  if (nc == NULL || nc->sock == INVALID_SOCKET) return;
-  struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-  if (nc->flags & MG_F_UDP) {
-    struct udp_pcb *upcb = cs->pcb.udp;
-    if (remote) {
-      memcpy(sa, &nc->sa, sizeof(*sa));
-    } else if (upcb != NULL) {
-      sa->sin.sin_port = htons(upcb->local_port);
-      SET_ADDR(sa, &upcb->local_ip);
+    s = mg_loadfile(fs, key);
+    rc = mbedtls_pk_parse_key(&tls->pk, (uint8_t *) s.ptr, s.len + 1, NULL,
+                              0 MGRNG);
+    if (key[0] != '-') free((char *) s.ptr);
+    if (rc != 0) {
+      mg_error(c, "tls key(%s) %#x", key, -rc);
+      goto fail;
     }
-  } else {
-    struct tcp_pcb *tpcb = cs->pcb.tcp;
-    if (remote) {
-      memcpy(sa, &nc->sa, sizeof(*sa));
-    } else if (tpcb != NULL) {
-      sa->sin.sin_port = htons(tpcb->local_port);
-      SET_ADDR(sa, &tpcb->local_ip);
+    rc = mbedtls_ssl_conf_own_cert(&tls->conf, &tls->cert, &tls->pk);
+    if (rc != 0) {
+      mg_error(c, "own cert %#x", -rc);
+      goto fail;
     }
   }
+  if ((rc = mbedtls_ssl_setup(&tls->ssl, &tls->conf)) != 0) {
+    mg_error(c, "setup err %#x", -rc);
+    goto fail;
+  }
+  c->tls = tls;
+  c->is_tls = 1;
+  c->is_tls_hs = 1;
+  if (c->is_client && c->is_resolving == 0 && c->is_connecting == 0) {
+    mg_tls_handshake(c);
+  }
+  return;
+fail:
+  mg_tls_free(c);
 }
 
-void mg_lwip_if_sock_set(struct mg_connection *nc, sock_t sock) {
-  nc->sock = sock;
-}
-
-/* clang-format off */
-#define MG_LWIP_IFACE_VTABLE                                          \
-  {                                                                   \
-    mg_lwip_if_init,                                                  \
-    mg_lwip_if_free,                                                  \
-    mg_lwip_if_add_conn,                                              \
-    mg_lwip_if_remove_conn,                                           \
-    mg_lwip_if_poll,                                                  \
-    mg_lwip_if_listen_tcp,                                            \
-    mg_lwip_if_listen_udp,                                            \
-    mg_lwip_if_connect_tcp,                                           \
-    mg_lwip_if_connect_udp,                                           \
-    mg_lwip_if_tcp_send,                                              \
-    mg_lwip_if_udp_send,                                              \
-    mg_lwip_if_tcp_recv,                                              \
-    mg_lwip_if_udp_recv,                                              \
-    mg_lwip_if_create_conn,                                           \
-    mg_lwip_if_destroy_conn,                                          \
-    mg_lwip_if_sock_set,                                              \
-    mg_lwip_if_get_conn_addr,                                         \
-  }
-/* clang-format on */
-
-const struct mg_iface_vtable mg_lwip_iface_vtable = MG_LWIP_IFACE_VTABLE;
-#if MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL
-const struct mg_iface_vtable mg_default_iface_vtable = MG_LWIP_IFACE_VTABLE;
-#endif
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  long n = mbedtls_ssl_read(&tls->ssl, (unsigned char *) buf, len);
+  return n == 0 ? -1 : n == MBEDTLS_ERR_SSL_WANT_READ ? 0 : n;
+}
 
-#endif /* MG_ENABLE_NET_IF_LWIP_LOW_LEVEL */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/lwip/mg_lwip_ev_mgr.c"
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  long n = mbedtls_ssl_write(&tls->ssl, (unsigned char *) buf, len);
+  return n == 0 ? -1 : n == MBEDTLS_ERR_SSL_WANT_WRITE ? 0 : n;
+}
 #endif
 
-#if MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL
-
-#ifndef MG_SIG_QUEUE_LEN
-#define MG_SIG_QUEUE_LEN 32
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tls_openssl.c"
 #endif
 
-struct mg_ev_mgr_lwip_signal {
-  int sig;
-  struct mg_connection *nc;
-};
-
-struct mg_ev_mgr_lwip_data {
-  struct mg_ev_mgr_lwip_signal sig_queue[MG_SIG_QUEUE_LEN];
-  int sig_queue_len;
-  int start_index;
-};
 
-void mg_lwip_post_signal(enum mg_sig_type sig, struct mg_connection *nc) {
-  struct mg_ev_mgr_lwip_data *md =
-      (struct mg_ev_mgr_lwip_data *) nc->iface->data;
-  mgos_lock();
-  if (md->sig_queue_len >= MG_SIG_QUEUE_LEN) {
-    mgos_unlock();
-    return;
-  }
-  int end_index = (md->start_index + md->sig_queue_len) % MG_SIG_QUEUE_LEN;
-  md->sig_queue[end_index].sig = sig;
-  md->sig_queue[end_index].nc = nc;
-  md->sig_queue_len++;
-  mg_lwip_mgr_schedule_poll(nc->mgr);
-  mgos_unlock();
-}
-
-void mg_ev_mgr_lwip_process_signals(struct mg_mgr *mgr) {
-  struct mg_ev_mgr_lwip_data *md =
-      (struct mg_ev_mgr_lwip_data *) mgr->ifaces[MG_MAIN_IFACE]->data;
-  while (md->sig_queue_len > 0) {
-    mgos_lock();
-    int i = md->start_index;
-    int sig = md->sig_queue[i].sig;
-    struct mg_connection *nc = md->sig_queue[i].nc;
-    struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-    md->start_index = (i + 1) % MG_SIG_QUEUE_LEN;
-    md->sig_queue_len--;
-    mgos_unlock();
-    if (nc->iface == NULL || nc->mgr == NULL) continue;
-    switch (sig) {
-      case MG_SIG_CONNECT_RESULT: {
-        mg_if_connect_cb(nc, cs->err);
-        break;
-      }
-      case MG_SIG_CLOSE_CONN: {
-        mg_close_conn(nc);
-        break;
-      }
-      case MG_SIG_RECV: {
-        cs->recv_pending = 0;
-        mg_if_can_recv_cb(nc);
-        mbuf_trim(&nc->recv_mbuf);
-        break;
-      }
-      case MG_SIG_TOMBSTONE: {
-        break;
-      }
-      case MG_SIG_ACCEPT: {
-        mg_lwip_handle_accept(nc);
-        break;
-      }
-    }
-  }
-}
+#if MG_ENABLE_OPENSSL
+static int mg_tls_err(struct mg_tls *tls, int res) {
+  int err = SSL_get_error(tls->ssl, res);
+  // We've just fetched the last error from the queue.
+  // Now we need to clear the error queue. If we do not, then the following
+  // can happen (actually reported):
+  //  - A new connection is accept()-ed with cert error (e.g. self-signed cert)
+  //  - Since all accept()-ed connections share listener's context,
+  //  - *ALL* SSL accepted connection report read error on the next poll cycle.
+  //    Thus a single errored connection can close all the rest, unrelated ones.
+  // Clearing the error keeps the shared SSL_CTX in an OK state.
 
-void mg_lwip_if_init(struct mg_iface *iface) {
-  LOG(LL_INFO, ("Mongoose %s, LwIP %u.%u.%u", MG_VERSION, LWIP_VERSION_MAJOR,
-                LWIP_VERSION_MINOR, LWIP_VERSION_REVISION));
-  iface->data = MG_CALLOC(1, sizeof(struct mg_ev_mgr_lwip_data));
-#if !NO_SYS && !LWIP_TCPIP_CORE_LOCKING
-  sys_sem_new(&s_tcpip_call_lock_sem, 1);
-  sys_sem_new(&s_tcpip_call_sync_sem, 0);
+  if (err != 0) ERR_print_errors_fp(stderr);
+  ERR_clear_error();
+  if (err == SSL_ERROR_WANT_READ) return 0;
+  if (err == SSL_ERROR_WANT_WRITE) return 0;
+  return err;
+}
+
+void mg_tls_init(struct mg_connection *c, struct mg_tls_opts *opts) {
+  struct mg_tls *tls = (struct mg_tls *) calloc(1, sizeof(*tls));
+  const char *id = "mongoose";
+  static unsigned char s_initialised = 0;
+  int rc;
+
+  if (tls == NULL) {
+    mg_error(c, "TLS OOM");
+    goto fail;
+  }
+
+  if (!s_initialised) {
+    SSL_library_init();
+    s_initialised++;
+  }
+  LOG(LL_DEBUG, ("%lu Setting TLS, CA: %s, cert: %s, key: %s", c->id,
+                 opts->ca == NULL ? "null" : opts->ca,
+                 opts->cert == NULL ? "null" : opts->cert,
+                 opts->certkey == NULL ? "null" : opts->certkey));
+  tls->ctx = c->is_client ? SSL_CTX_new(SSLv23_client_method())
+                          : SSL_CTX_new(SSLv23_server_method());
+  if ((tls->ssl = SSL_new(tls->ctx)) == NULL) {
+    mg_error(c, "SSL_new");
+    goto fail;
+  }
+  SSL_set_session_id_context(tls->ssl, (const uint8_t *) id,
+                             (unsigned) strlen(id));
+  // Disable deprecated protocols
+  SSL_set_options(tls->ssl, SSL_OP_NO_SSLv2);
+  SSL_set_options(tls->ssl, SSL_OP_NO_SSLv3);
+  SSL_set_options(tls->ssl, SSL_OP_NO_TLSv1);
+  SSL_set_options(tls->ssl, SSL_OP_NO_TLSv1_1);
+#ifdef MG_ENABLE_OPENSSL_NO_COMPRESSION
+  SSL_set_options(tls->ssl, SSL_OP_NO_COMPRESSION);
+#endif
+#ifdef MG_ENABLE_OPENSSL_CIPHER_SERVER_PREFERENCE
+  SSL_set_options(tls->ssl, SSL_OP_CIPHER_SERVER_PREFERENCE);
+#endif
+
+  if (opts->ca != NULL && opts->ca[0] != '\0') {
+    SSL_set_verify(tls->ssl, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
+                   NULL);
+    if ((rc = SSL_CTX_load_verify_locations(tls->ctx, opts->ca, NULL)) != 1) {
+      mg_error(c, "parse(%s): err %d", opts->ca, mg_tls_err(tls, rc));
+      goto fail;
+    }
+  }
+  if (opts->cert != NULL && opts->cert[0] != '\0') {
+    const char *key = opts->certkey;
+    if (key == NULL) key = opts->cert;
+    if ((rc = SSL_use_certificate_file(tls->ssl, opts->cert, 1)) != 1) {
+      mg_error(c, "Invalid SSL cert, err %d", mg_tls_err(tls, rc));
+      goto fail;
+    } else if ((rc = SSL_use_PrivateKey_file(tls->ssl, key, 1)) != 1) {
+      mg_error(c, "Invalid SSL key, err %d", mg_tls_err(tls, rc));
+      goto fail;
+#if OPENSSL_VERSION_NUMBER > 0x10100000L
+    } else if ((rc = SSL_use_certificate_chain_file(tls->ssl, opts->cert)) !=
+               1) {
+      mg_error(c, "Invalid CA, err %d", mg_tls_err(tls, rc));
+      goto fail;
 #endif
+    } else {
+      SSL_set_mode(tls->ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
+#if OPENSSL_VERSION_NUMBER > 0x10002000L
+      SSL_set_ecdh_auto(tls->ssl, 1);
+#endif
+    }
+  }
+  if (opts->ciphers != NULL) SSL_set_cipher_list(tls->ssl, opts->ciphers);
+  if (opts->srvname.len > 0) {
+    char mem[128], *buf = mem;
+    mg_asprintf(&buf, sizeof(mem), "%.*s", (int) opts->srvname.len,
+                opts->srvname.ptr);
+    SSL_set_tlsext_host_name(tls->ssl, buf);
+    if (buf != mem) free(buf);
+  }
+  c->tls = tls;
+  c->is_tls = 1;
+  c->is_tls_hs = 1;
+  if (c->is_client && c->is_resolving == 0 && c->is_connecting == 0) {
+    mg_tls_handshake(c);
+  }
+  LOG(LL_DEBUG, ("%lu SSL %s OK", c->id, c->is_accepted ? "accept" : "client"));
+  return;
+fail:
+  c->is_closing = 1;
+  free(tls);
+}
+
+void mg_tls_handshake(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int rc;
+  SSL_set_fd(tls->ssl, (int) (size_t) c->fd);
+  rc = c->is_client ? SSL_connect(tls->ssl) : SSL_accept(tls->ssl);
+  if (rc == 1) {
+    LOG(LL_DEBUG, ("%lu success", c->id));
+    c->is_tls_hs = 0;
+  } else {
+    int code = mg_tls_err(tls, rc);
+    if (code != 0) mg_error(c, "tls hs: rc %d, err %d", rc, code);
+  }
 }
 
-void mg_lwip_if_free(struct mg_iface *iface) {
-  MG_FREE(iface->data);
-  iface->data = NULL;
+void mg_tls_free(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  if (tls == NULL) return;
+  SSL_free(tls->ssl);
+  SSL_CTX_free(tls->ctx);
+  free(tls);
+  c->tls = NULL;
 }
 
-void mg_lwip_if_add_conn(struct mg_connection *nc) {
-  (void) nc;
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int n = SSL_read(tls->ssl, buf, (int) len);
+  return n == 0 ? -1 : n < 0 && mg_tls_err(tls, n) == 0 ? 0 : n;
 }
 
-void mg_lwip_if_remove_conn(struct mg_connection *nc) {
-  struct mg_ev_mgr_lwip_data *md =
-      (struct mg_ev_mgr_lwip_data *) nc->iface->data;
-  /* Walk the queue and null-out further signals for this conn. */
-  for (int i = 0; i < MG_SIG_QUEUE_LEN; i++) {
-    if (md->sig_queue[i].nc == nc) {
-      md->sig_queue[i].sig = MG_SIG_TOMBSTONE;
-    }
-  }
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int n = SSL_write(tls->ssl, buf, (int) len);
+  return n == 0 ? -1 : n < 0 && mg_tls_err(tls, n) == 0 ? 0 : n;
 }
-
-time_t mg_lwip_if_poll(struct mg_iface *iface, int timeout_ms) {
-  struct mg_mgr *mgr = iface->mgr;
-  int n = 0;
-  double now = mg_time();
-  struct mg_connection *nc, *tmp;
-  double min_timer = 0;
-  int num_timers = 0;
-#if 0
-  DBG(("begin poll @%u", (unsigned int) (now * 1000)));
 #endif
-  mg_ev_mgr_lwip_process_signals(mgr);
-  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
-    struct mg_lwip_conn_state *cs = (struct mg_lwip_conn_state *) nc->sock;
-    tmp = nc->next;
-    n++;
-    if (!mg_if_poll(nc, now)) continue;
-    if (nc->sock != INVALID_SOCKET &&
-        !(nc->flags & (MG_F_UDP | MG_F_LISTENING)) && cs->pcb.tcp != NULL &&
-        cs->pcb.tcp->unsent != NULL) {
-      mg_lwip_netif_run_on_tcpip(tcp_output_tcpip, cs->pcb.tcp);
-    }
-    if (nc->ev_timer_time > 0) {
-      if (num_timers == 0 || nc->ev_timer_time < min_timer) {
-        min_timer = nc->ev_timer_time;
-      }
-      num_timers++;
-    }
 
-    if (nc->sock != INVALID_SOCKET) {
-      if (mg_lwip_if_can_send(nc, cs)) {
-        mg_if_can_send_cb(nc);
-        mbuf_trim(&nc->send_mbuf);
-      }
-      if (cs->rx_chain != NULL) {
-        mg_if_can_recv_cb(nc);
-      } else if (cs->draining_rx_chain) {
-        /*
-         * If the connection is about to close, and rx_chain is finally empty,
-         * send the MG_SIG_CLOSE_CONN signal
-         */
-        mg_lwip_post_signal(MG_SIG_CLOSE_CONN, nc);
-      }
-    }
-  }
-#if 0
-  DBG(("end poll @%u, %d conns, %d timers (min %u), next in %d ms",
-       (unsigned int) (now * 1000), n, num_timers,
-       (unsigned int) (min_timer * 1000), timeout_ms));
+#ifdef MG_ENABLE_LINES
+#line 1 "src/url.c"
 #endif
-  (void) timeout_ms;
-  return now;
+
+#include <stdlib.h>
+
+struct url {
+  size_t key, user, pass, host, port, uri, end;
+};
+
+int mg_url_is_ssl(const char *url) {
+  return strncmp(url, "wss:", 4) == 0 || strncmp(url, "https:", 6) == 0 ||
+         strncmp(url, "mqtts:", 6) == 0 || strncmp(url, "ssl:", 4) == 0 ||
+         strncmp(url, "tls:", 4) == 0;
 }
 
-#endif /* MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/wince/wince_libc.c"
+static struct url urlparse(const char *url) {
+  size_t i;
+  struct url u;
+  memset(&u, 0, sizeof(u));
+  for (i = 0; url[i] != '\0'; i++) {
+    if (i > 0 && u.host == 0 && url[i - 1] == '/' && url[i] == '/') {
+      u.host = i + 1;
+      u.port = 0;
+    } else if (url[i] == ']') {
+      u.port = 0;  // IPv6 URLs, like http://[::1]/bar
+    } else if (url[i] == ':' && u.port == 0 && u.uri == 0) {
+      u.port = i + 1;
+    } else if (url[i] == '@' && u.user == 0 && u.pass == 0) {
+      u.user = u.host;
+      u.pass = u.port;
+      u.host = i + 1;
+      u.port = 0;
+    } else if (u.host && u.uri == 0 && url[i] == '/') {
+      u.uri = i;
+    }
+  }
+  u.end = i;
+#if 0
+  printf("[%s] %d %d %d %d %d\n", url, u.user, u.pass, u.host, u.port, u.uri);
 #endif
+  return u;
+}
 
-#ifdef WINCE
+struct mg_str mg_url_host(const char *url) {
+  struct url u = urlparse(url);
+  size_t n = u.port  ? u.port - u.host - 1
+             : u.uri ? u.uri - u.host
+                     : u.end - u.host;
+  struct mg_str s = mg_str_n(url + u.host, n);
+  return s;
+}
 
-const char *strerror(int err) {
-  /*
-   * TODO(alashkin): there is no strerror on WinCE;
-   * look for similar wce_xxxx function
-   */
-  static char buf[10];
-  snprintf(buf, sizeof(buf), "%d", err);
-  return buf;
+const char *mg_url_uri(const char *url) {
+  struct url u = urlparse(url);
+  return u.uri ? url + u.uri : "/";
 }
 
-int open(const char *filename, int oflag, int pmode) {
-  /*
-   * TODO(alashkin): mg_open function is not used in mongoose
-   * but exists in documentation as utility function
-   * Shall we delete it at all or implement for WinCE as well?
-   */
-  DebugBreak();
-  return 0; /* for compiler */
+unsigned short mg_url_port(const char *url) {
+  struct url u = urlparse(url);
+  unsigned short port = 0;
+  if (strncmp(url, "http:", 5) == 0 || strncmp(url, "ws:", 3) == 0) port = 80;
+  if (strncmp(url, "wss:", 4) == 0 || strncmp(url, "https:", 6) == 0)
+    port = 443;
+  if (strncmp(url, "mqtt:", 5) == 0) port = 1883;
+  if (strncmp(url, "mqtts:", 6) == 0) port = 8883;
+  if (u.port) port = (unsigned short) atoi(url + u.port);
+  return port;
 }
 
-int _wstati64(const wchar_t *path, cs_stat_t *st) {
-  DWORD fa = GetFileAttributesW(path);
-  if (fa == INVALID_FILE_ATTRIBUTES) {
-    return -1;
-  }
-  memset(st, 0, sizeof(*st));
-  if ((fa & FILE_ATTRIBUTE_DIRECTORY) == 0) {
-    HANDLE h;
-    FILETIME ftime;
-    st->st_mode |= _S_IFREG;
-    h = CreateFileW(path, GENERIC_READ, 0, NULL, OPEN_EXISTING,
-                    FILE_ATTRIBUTE_NORMAL, NULL);
-    if (h == INVALID_HANDLE_VALUE) {
-      return -1;
-    }
-    st->st_size = GetFileSize(h, NULL);
-    GetFileTime(h, NULL, NULL, &ftime);
-    st->st_mtime = (uint32_t)((((uint64_t) ftime.dwLowDateTime +
-                                ((uint64_t) ftime.dwHighDateTime << 32)) /
-                               10000000.0) -
-                              11644473600);
-    CloseHandle(h);
-  } else {
-    st->st_mode |= _S_IFDIR;
+struct mg_str mg_url_user(const char *url) {
+  struct url u = urlparse(url);
+  struct mg_str s = mg_str("");
+  if (u.user && (u.pass || u.host)) {
+    size_t n = u.pass ? u.pass - u.user - 1 : u.host - u.user - 1;
+    s = mg_str_n(url + u.user, n);
   }
-  return 0;
+  return s;
 }
 
-/* Windows CE doesn't have neither gmtime nor strftime */
-static void mg_gmt_time_string(char *buf, size_t buf_len, time_t *t) {
-  FILETIME ft;
-  SYSTEMTIME systime;
-  if (t != NULL) {
-    uint64_t filetime = (*t + 11644473600) * 10000000;
-    ft.dwLowDateTime = filetime & 0xFFFFFFFF;
-    ft.dwHighDateTime = (filetime & 0xFFFFFFFF00000000) >> 32;
-    FileTimeToSystemTime(&ft, &systime);
-  } else {
-    GetSystemTime(&systime);
+struct mg_str mg_url_pass(const char *url) {
+  struct url u = urlparse(url);
+  struct mg_str s = mg_str_n("", 0UL);
+  if (u.pass && u.host) {
+    size_t n = u.host - u.pass - 1;
+    s = mg_str_n(url + u.pass, n);
   }
-  /* There is no PRIu16 in WinCE SDK */
-  snprintf(buf, buf_len, "%d.%d.%d %d:%d:%d GMT", (int) systime.wYear,
-           (int) systime.wMonth, (int) systime.wDay, (int) systime.wHour,
-           (int) systime.wMinute, (int) systime.wSecond);
+  return s;
 }
 
-#endif
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/pic32/pic32_net_if.h"
+#ifdef MG_ENABLE_LINES
+#line 1 "src/util.c"
 #endif
 
-#ifndef CS_COMMON_PLATFORMS_PIC32_NET_IF_H_
-#define CS_COMMON_PLATFORMS_PIC32_NET_IF_H_
 
-/* Amalgamated: #include "mongoose/src/net_if.h" */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-#ifndef MG_ENABLE_NET_IF_PIC32
-#define MG_ENABLE_NET_IF_PIC32 MG_NET_IF == MG_NET_IF_PIC32
+#if MG_ARCH == MG_ARCH_UNIX && defined(__APPLE__)
+#include <mach/mach_time.h>
 #endif
 
-extern const struct mg_iface_vtable mg_pic32_iface_vtable;
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* CS_COMMON_PLATFORMS_PIC32_NET_IF_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/pic32/pic32_net_if.c"
+#if MG_ENABLE_CUSTOM_RANDOM
+#else
+void mg_random(void *buf, size_t len) {
+  bool done = false;
+  unsigned char *p = (unsigned char *) buf;
+#if MG_ARCH == MG_ARCH_ESP32
+  while (len--) *p++ = (unsigned char) (esp_random() & 255);
+  done = true;
+#elif MG_ARCH == MG_ARCH_WIN32
+#elif MG_ARCH == MG_ARCH_UNIX
+  FILE *fp = fopen("/dev/urandom", "rb");
+  if (fp != NULL) {
+    if (fread(buf, 1, len, fp) == len) done = true;
+    fclose(fp);
+  }
 #endif
-
-#if MG_ENABLE_NET_IF_PIC32
-
-int mg_pic32_if_create_conn(struct mg_connection *nc) {
-  (void) nc;
-  return 1;
+  // If everything above did not work, fallback to a pseudo random generator
+  while (!done && len--) *p++ = (unsigned char) (rand() & 255);
 }
+#endif
 
-void mg_pic32_if_recved(struct mg_connection *nc, size_t len) {
-  (void) nc;
-  (void) len;
+bool mg_globmatch(const char *s1, size_t n1, const char *s2, size_t n2) {
+  size_t i = 0, j = 0, ni = 0, nj = 0;
+  while (i < n1 || j < n2) {
+    if (i < n1 && j < n2 && (s1[i] == '?' || s2[j] == s1[i])) {
+      i++, j++;
+    } else if (i < n1 && (s1[i] == '*' || s1[i] == '#')) {
+      ni = i, nj = j + 1, i++;
+    } else if (nj > 0 && nj <= n2 && (s1[ni] == '#' || s2[j] != '/')) {
+      i = ni, j = nj;
+    } else {
+      // printf(">>: [%s] [%s] %d %d %d %d\n", s1, s2, i, j, ni, nj);
+      return false;
+    }
+  }
+  return true;
 }
 
-void mg_pic32_if_add_conn(struct mg_connection *nc) {
-  (void) nc;
+static size_t mg_nce(const char *s, size_t n, size_t ofs, size_t *koff,
+                     size_t *klen, size_t *voff, size_t *vlen) {
+  size_t kvlen, kl;
+  for (kvlen = 0; ofs + kvlen < n && s[ofs + kvlen] != ',';) kvlen++;
+  for (kl = 0; kl < kvlen && s[ofs + kl] != '=';) kl++;
+  if (koff != NULL) *koff = ofs;
+  if (klen != NULL) *klen = kl;
+  if (voff != NULL) *voff = kl < kvlen ? ofs + kl + 1 : 0;
+  if (vlen != NULL) *vlen = kl < kvlen ? kvlen - kl - 1 : 0;
+  ofs += kvlen + 1;
+  return ofs > n ? n : ofs;
 }
 
-void mg_pic32_if_init(struct mg_iface *iface) {
-  (void) iface;
-  (void) mg_get_errno(); /* Shutup compiler */
+bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v) {
+  size_t koff = 0, klen = 0, voff = 0, vlen = 0, off = 0;
+  if (s->ptr == NULL || s->len == 0) return 0;
+  off = mg_nce(s->ptr, s->len, 0, &koff, &klen, &voff, &vlen);
+  if (k != NULL) *k = mg_str_n(s->ptr + koff, klen);
+  if (v != NULL) *v = mg_str_n(s->ptr + voff, vlen);
+  *s = mg_str_n(s->ptr + off, s->len - off);
+  return off > 0;
 }
 
-void mg_pic32_if_free(struct mg_iface *iface) {
-  (void) iface;
+uint32_t mg_ntohl(uint32_t net) {
+  uint8_t data[4] = {0, 0, 0, 0};
+  memcpy(&data, &net, sizeof(data));
+  return (((uint32_t) data[3]) << 0) | (((uint32_t) data[2]) << 8) |
+         (((uint32_t) data[1]) << 16) | (((uint32_t) data[0]) << 24);
 }
 
-void mg_pic32_if_remove_conn(struct mg_connection *nc) {
-  (void) nc;
+uint16_t mg_ntohs(uint16_t net) {
+  uint8_t data[2] = {0, 0};
+  memcpy(&data, &net, sizeof(data));
+  return (uint16_t) ((uint16_t) data[1] | (((uint16_t) data[0]) << 8));
 }
 
-void mg_pic32_if_destroy_conn(struct mg_connection *nc) {
-  if (nc->sock == INVALID_SOCKET) return;
-  /* For UDP, only close outgoing sockets or listeners. */
-  if (!(nc->flags & MG_F_UDP)) {
-    /* Close TCP */
-    TCPIP_TCP_Close((TCP_SOCKET) nc->sock);
-  } else if (nc->listener == NULL) {
-    /* Only close outgoing UDP or listeners. */
-    TCPIP_UDP_Close((UDP_SOCKET) nc->sock);
+char *mg_hexdump(const void *buf, size_t len) {
+  const unsigned char *p = (const unsigned char *) buf;
+  size_t i, idx, n = 0, ofs = 0, dlen = len * 5 + 100;
+  char ascii[17] = "", *dst = (char *) calloc(1, dlen);
+  if (dst == NULL) return dst;
+  for (i = 0; i < len; i++) {
+    idx = i % 16;
+    if (idx == 0) {
+      if (i > 0 && dlen > n)
+        n += (size_t) snprintf(dst + n, dlen - n, "  %s\n", ascii);
+      if (dlen > n)
+        n += (size_t) snprintf(dst + n, dlen - n, "%04x ", (int) (i + ofs));
+    }
+    if (dlen < n) break;
+    n += (size_t) snprintf(dst + n, dlen - n, " %02x", p[i]);
+    ascii[idx] = (char) (p[i] < 0x20 || p[i] > 0x7e ? '.' : p[i]);
+    ascii[idx + 1] = '\0';
   }
-
-  nc->sock = INVALID_SOCKET;
+  while (i++ % 16) {
+    if (n < dlen) n += (size_t) snprintf(dst + n, dlen - n, "%s", "   ");
+  }
+  if (n < dlen) n += (size_t) snprintf(dst + n, dlen - n, "  %s\n", ascii);
+  if (n > dlen - 1) n = dlen - 1;
+  dst[n] = '\0';
+  return dst;
 }
 
-int mg_pic32_if_listen_udp(struct mg_connection *nc, union socket_address *sa) {
-  nc->sock = TCPIP_UDP_ServerOpen(
-      sa->sin.sin_family == AF_INET ? IP_ADDRESS_TYPE_IPV4
-                                    : IP_ADDRESS_TYPE_IPV6,
-      ntohs(sa->sin.sin_port),
-      sa->sin.sin_addr.s_addr == 0 ? 0 : (IP_MULTI_ADDRESS *) &sa->sin);
-  if (nc->sock == INVALID_SOCKET) {
-    return -1;
+char *mg_hex(const void *buf, size_t len, char *to) {
+  const unsigned char *p = (const unsigned char *) buf;
+  static const char *hex = "0123456789abcdef";
+  size_t i = 0;
+  for (; len--; p++) {
+    to[i++] = hex[p[0] >> 4];
+    to[i++] = hex[p[0] & 0x0f];
   }
-  return 0;
+  to[i] = '\0';
+  return to;
 }
 
-void mg_pic32_if_udp_send(struct mg_connection *nc, const void *buf,
-                          size_t len) {
-  mbuf_append(&nc->send_mbuf, buf, len);
+static unsigned char mg_unhex_nimble(unsigned char c) {
+  return (c >= '0' && c <= '9')   ? (unsigned char) (c - '0')
+         : (c >= 'A' && c <= 'F') ? (unsigned char) (c - '7')
+                                  : (unsigned char) (c - 'W');
 }
 
-void mg_pic32_if_tcp_send(struct mg_connection *nc, const void *buf,
-                          size_t len) {
-  mbuf_append(&nc->send_mbuf, buf, len);
+unsigned long mg_unhexn(const char *s, size_t len) {
+  unsigned long i = 0, v = 0;
+  for (i = 0; i < len; i++) v <<= 4, v |= mg_unhex_nimble(((uint8_t *) s)[i]);
+  return v;
 }
 
-int mg_pic32_if_listen_tcp(struct mg_connection *nc, union socket_address *sa) {
-  nc->sock = TCPIP_TCP_ServerOpen(
-      sa->sin.sin_family == AF_INET ? IP_ADDRESS_TYPE_IPV4
-                                    : IP_ADDRESS_TYPE_IPV6,
-      ntohs(sa->sin.sin_port),
-      sa->sin.sin_addr.s_addr == 0 ? 0 : (IP_MULTI_ADDRESS *) &sa->sin);
-  memcpy(&nc->sa, sa, sizeof(*sa));
-  if (nc->sock == INVALID_SOCKET) {
-    return -1;
+void mg_unhex(const char *buf, size_t len, unsigned char *to) {
+  size_t i;
+  for (i = 0; i < len; i += 2) {
+    to[i >> 1] = (unsigned char) mg_unhexn(&buf[i], 2);
   }
-  return 0;
 }
 
-static int mg_accept_conn(struct mg_connection *lc) {
-  struct mg_connection *nc;
-  TCP_SOCKET_INFO si;
-  union socket_address sa;
+int mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap) {
+  va_list ap_copy;
+  int len;
 
-  nc = mg_if_accept_new_conn(lc);
+  va_copy(ap_copy, ap);
+  len = vsnprintf(*buf, size, fmt, ap_copy);
+  va_end(ap_copy);
 
-  if (nc == NULL) {
-    return 0;
+  if (len < 0) {
+    // eCos and Windows are not standard-compliant and return -1 when
+    // the buffer is too small. Keep allocating larger buffers until we
+    // succeed or out of memory.
+    // LCOV_EXCL_START
+    *buf = NULL;
+    while (len < 0) {
+      free(*buf);
+      if (size == 0) size = 5;
+      size *= 2;
+      if ((*buf = (char *) calloc(1, size)) == NULL) {
+        len = -1;
+        break;
+      }
+      va_copy(ap_copy, ap);
+      len = vsnprintf(*buf, size - 1, fmt, ap_copy);
+      va_end(ap_copy);
+    }
+    // Microsoft version of vsnprintf() is not always null-terminated, so put
+    // the terminator manually
+    if (*buf != NULL) (*buf)[len] = 0;
+    // LCOV_EXCL_STOP
+  } else if (len >= (int) size) {
+    /// Standard-compliant code path. Allocate a buffer that is large enough
+    if ((*buf = (char *) calloc(1, (size_t) len + 1)) == NULL) {
+      len = -1;  // LCOV_EXCL_LINE
+    } else {     // LCOV_EXCL_LINE
+      va_copy(ap_copy, ap);
+      len = vsnprintf(*buf, (size_t) len + 1, fmt, ap_copy);
+      va_end(ap_copy);
+    }
   }
 
-  nc->sock = lc->sock;
-  nc->flags &= ~MG_F_LISTENING;
+  return len;
+}
 
-  if (!TCPIP_TCP_SocketInfoGet((TCP_SOCKET) nc->sock, &si)) {
-    return 0;
-  }
+int mg_asprintf(char **buf, size_t size, const char *fmt, ...) {
+  int ret;
+  va_list ap;
+  va_start(ap, fmt);
+  ret = mg_vasprintf(buf, size, fmt, ap);
+  va_end(ap);
+  return ret;
+}
 
-  if (si.addressType == IP_ADDRESS_TYPE_IPV4) {
-    sa.sin.sin_family = AF_INET;
-    sa.sin.sin_port = htons(si.remotePort);
-    sa.sin.sin_addr.s_addr = si.remoteIPaddress.v4Add.Val;
-  } else {
-    /* TODO(alashkin): do something with _potential_ IPv6 */
-    memset(&sa, 0, sizeof(sa));
+int64_t mg_to64(struct mg_str str) {
+  int64_t result = 0, neg = 1, max = 922337203685477570 /* INT64_MAX/10-10 */;
+  size_t i = 0;
+  while (i < str.len && (str.ptr[i] == ' ' || str.ptr[i] == '\t')) i++;
+  if (i < str.len && str.ptr[i] == '-') neg = -1, i++;
+  while (i < str.len && str.ptr[i] >= '0' && str.ptr[i] <= '9') {
+    if (result > max) return 0;
+    result *= 10;
+    result += (str.ptr[i] - '0');
+    i++;
   }
+  return result * neg;
+}
 
-  mg_if_accept_tcp_cb(nc, (union socket_address *) &sa, sizeof(sa));
-
-  return mg_pic32_if_listen_tcp(lc, &lc->sa) >= 0;
+uint32_t mg_crc32(uint32_t crc, const char *buf, size_t len) {
+  int i;
+  crc = ~crc;
+  while (len--) {
+    crc ^= *(unsigned char *) buf++;
+    for (i = 0; i < 8; i++) crc = crc & 1 ? (crc >> 1) ^ 0xedb88320 : crc >> 1;
+  }
+  return ~crc;
 }
 
-char *inet_ntoa(struct in_addr in) {
-  static char addr[17];
-  snprintf(addr, sizeof(addr), "%d.%d.%d.%d", (int) in.S_un.S_un_b.s_b1,
-           (int) in.S_un.S_un_b.s_b2, (int) in.S_un.S_un_b.s_b3,
-           (int) in.S_un.S_un_b.s_b4);
-  return addr;
+static int isbyte(int n) {
+  return n >= 0 && n <= 255;
 }
 
-static void mg_handle_send(struct mg_connection *nc) {
-  uint16_t bytes_written = 0;
-  if (nc->flags & MG_F_UDP) {
-    if (!TCPIP_UDP_RemoteBind(
-            (UDP_SOCKET) nc->sock,
-            nc->sa.sin.sin_family == AF_INET ? IP_ADDRESS_TYPE_IPV4
-                                             : IP_ADDRESS_TYPE_IPV6,
-            ntohs(nc->sa.sin.sin_port), (IP_MULTI_ADDRESS *) &nc->sa.sin)) {
-      nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-      return;
-    }
-    bytes_written = TCPIP_UDP_TxPutIsReady((UDP_SOCKET) nc->sock, 0);
-    if (bytes_written >= nc->send_mbuf.len) {
-      if (TCPIP_UDP_ArrayPut((UDP_SOCKET) nc->sock,
-                             (uint8_t *) nc->send_mbuf.buf,
-                             nc->send_mbuf.len) != nc->send_mbuf.len) {
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-        bytes_written = 0;
-      }
-    }
-  } else {
-    bytes_written = TCPIP_TCP_FifoTxFreeGet((TCP_SOCKET) nc->sock);
-    if (bytes_written != 0) {
-      if (bytes_written > nc->send_mbuf.len) {
-        bytes_written = nc->send_mbuf.len;
-      }
-      if (TCPIP_TCP_ArrayPut((TCP_SOCKET) nc->sock,
-                             (uint8_t *) nc->send_mbuf.buf,
-                             bytes_written) != bytes_written) {
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-        bytes_written = 0;
-      }
-    }
+static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
+  int n, a, b, c, d, slash = 32, len = 0;
+  if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
+       sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
+      isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) && slash >= 0 &&
+      slash < 33) {
+    len = n;
+    *net = ((uint32_t) a << 24) | ((uint32_t) b << 16) | ((uint32_t) c << 8) |
+           (uint32_t) d;
+    *mask = slash ? (uint32_t) (0xffffffffU << (32 - slash)) : (uint32_t) 0;
   }
-
-  mg_if_sent_cb(nc, bytes_written);
+  return len;
 }
 
-static void mg_handle_recv(struct mg_connection *nc) {
-  uint16_t bytes_read = 0;
-  uint8_t *buf = NULL;
-  if (nc->flags & MG_F_UDP) {
-    bytes_read = TCPIP_UDP_GetIsReady((UDP_SOCKET) nc->sock);
-    if (bytes_read != 0 &&
-        (nc->recv_mbuf_limit == -1 ||
-         nc->recv_mbuf.len + bytes_read < nc->recv_mbuf_limit)) {
-      buf = (uint8_t *) MG_MALLOC(bytes_read);
-      if (TCPIP_UDP_ArrayGet((UDP_SOCKET) nc->sock, buf, bytes_read) !=
-          bytes_read) {
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-        bytes_read = 0;
-        MG_FREE(buf);
-      }
-    }
-  } else {
-    bytes_read = TCPIP_TCP_GetIsReady((TCP_SOCKET) nc->sock);
-    if (bytes_read != 0) {
-      if (nc->recv_mbuf_limit != -1 &&
-          nc->recv_mbuf_limit - nc->recv_mbuf.len > bytes_read) {
-        bytes_read = nc->recv_mbuf_limit - nc->recv_mbuf.len;
-      }
-      buf = (uint8_t *) MG_MALLOC(bytes_read);
-      if (TCPIP_TCP_ArrayGet((TCP_SOCKET) nc->sock, buf, bytes_read) !=
-          bytes_read) {
-        nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-        MG_FREE(buf);
-        bytes_read = 0;
-      }
-    }
+int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip) {
+  struct mg_str k, v;
+  int allowed = acl.len == 0 ? '+' : '-';  // If any ACL is set, deny by default
+  while (mg_commalist(&acl, &k, &v)) {
+    uint32_t net, mask;
+    if (k.ptr[0] != '+' && k.ptr[0] != '-') return -1;
+    if (parse_net(&k.ptr[1], &net, &mask) == 0) return -2;
+    if ((mg_ntohl(remote_ip) & mask) == net) allowed = k.ptr[0];
   }
+  return allowed == '+';
+}
 
-  if (bytes_read != 0) {
-    mg_if_recv_tcp_cb(nc, buf, bytes_read, 1 /* own */);
-  }
+int64_t mg_millis(void) {
+#if MG_ARCH == MG_ARCH_WIN32
+  return GetTickCount();
+#elif MG_ARCH == MG_ARCH_ESP32
+  return esp_timer_get_time() / 1000;
+#elif MG_ARCH == MG_ARCH_ESP8266
+  return xTaskGetTickCount() * portTICK_PERIOD_MS;
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_FREERTOS_LWIP
+  return xTaskGetTickCount() * portTICK_PERIOD_MS;
+#elif MG_ARCH == MG_ARCH_AZURERTOS
+  return tx_time_get() * (1000 /* MS per SEC */ / TX_TIMER_TICKS_PER_SECOND);
+#elif MG_ARCH == MG_ARCH_UNIX && defined(__APPLE__)
+  uint64_t ticks = mach_absolute_time();
+  static mach_timebase_info_data_t timebase;
+  mach_timebase_info(&timebase);
+  double ticks_to_nanos = (double) timebase.numer / timebase.denom;
+  uint64_t uptime_nanos = (uint64_t) (ticks_to_nanos * ticks);
+  return (int64_t) (uptime_nanos / 1000000);
+#elif MG_ARCH == MG_ARCH_UNIX
+  struct timespec ts;
+#ifdef _POSIX_MONOTONIC_CLOCK
+#ifdef CLOCK_MONOTONIC_RAW
+  clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+#else
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+#endif
+#else
+  clock_gettime(CLOCK_REALTIME, &ts);
+#endif
+  return ((int64_t) ts.tv_sec * 1000 + (int64_t) ts.tv_nsec / 1000000);
+#else
+  return time(NULL) * 1000;
+#endif
 }
 
-time_t mg_pic32_if_poll(struct mg_iface *iface, int timeout_ms) {
-  struct mg_mgr *mgr = iface->mgr;
-  double now = mg_time();
-  struct mg_connection *nc, *tmp;
+#ifdef MG_ENABLE_LINES
+#line 1 "src/ws.c"
+#endif
+
 
-  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
-    tmp = nc->next;
 
-    if (nc->flags & MG_F_CONNECTING) {
-      /* processing connections */
-      if (nc->flags & MG_F_UDP ||
-          TCPIP_TCP_IsConnected((TCP_SOCKET) nc->sock)) {
-        mg_if_connect_cb(nc, 0);
-      }
-    } else if (nc->flags & MG_F_LISTENING) {
-      if (TCPIP_TCP_IsConnected((TCP_SOCKET) nc->sock)) {
-        /* accept new connections */
-        mg_accept_conn(nc);
-      }
-    } else {
-      if (nc->send_mbuf.len != 0) {
-        mg_handle_send(nc);
-      }
 
-      if (nc->recv_mbuf_limit == -1 ||
-          nc->recv_mbuf.len < nc->recv_mbuf_limit) {
-        mg_handle_recv(nc);
-      }
-    }
-  }
 
-  for (nc = mgr->active_connections; nc != NULL; nc = tmp) {
-    tmp = nc->next;
-    if ((nc->flags & MG_F_CLOSE_IMMEDIATELY) ||
-        (nc->send_mbuf.len == 0 && (nc->flags & MG_F_SEND_AND_CLOSE))) {
-      mg_close_conn(nc);
-    }
-  }
 
-  return now;
-}
 
-void mg_pic32_if_sock_set(struct mg_connection *nc, sock_t sock) {
-  nc->sock = sock;
+
+
+struct ws_msg {
+  uint8_t flags;
+  size_t header_len;
+  size_t data_len;
+};
+
+static void ws_handshake(struct mg_connection *c, const struct mg_str *wskey,
+                         const struct mg_str *wsproto, const char *fmt,
+                         va_list ap) {
+  const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
+  unsigned char sha[20], b64_sha[30];
+  char mem[128], *buf = mem;
+
+  mg_sha1_ctx sha_ctx;
+  mg_sha1_init(&sha_ctx);
+  mg_sha1_update(&sha_ctx, (unsigned char *) wskey->ptr, wskey->len);
+  mg_sha1_update(&sha_ctx, (unsigned char *) magic, 36);
+  mg_sha1_final(sha, &sha_ctx);
+  mg_base64_encode(sha, sizeof(sha), (char *) b64_sha);
+  buf[0] = '\0';
+  if (fmt != NULL) mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  mg_printf(c,
+            "HTTP/1.1 101 Switching Protocols\r\n"
+            "Upgrade: websocket\r\n"
+            "Connection: Upgrade\r\n"
+            "Sec-WebSocket-Accept: %s\r\n"
+            "%s",
+            b64_sha, buf);
+  if (buf != mem) free(buf);
+  if (wsproto != NULL) {
+    mg_printf(c, "Sec-WebSocket-Protocol: %.*s\r\n", (int) wsproto->len,
+              wsproto->ptr);
+  }
+  mg_send(c, "\r\n", 2);
 }
 
-void mg_pic32_if_get_conn_addr(struct mg_connection *nc, int remote,
-                               union socket_address *sa) {
-  /* TODO(alaskin): not implemented yet */
+static size_t ws_process(uint8_t *buf, size_t len, struct ws_msg *msg) {
+  size_t i, n = 0, mask_len = 0;
+  memset(msg, 0, sizeof(*msg));
+  if (len >= 2) {
+    n = buf[1] & 0x7f;                // Frame length
+    mask_len = buf[1] & 128 ? 4 : 0;  // last bit is a mask bit
+    msg->flags = buf[0];
+    if (n < 126 && len >= mask_len) {
+      msg->data_len = n;
+      msg->header_len = 2 + mask_len;
+    } else if (n == 126 && len >= 4 + mask_len) {
+      msg->header_len = 4 + mask_len;
+      msg->data_len = mg_ntohs(*(uint16_t *) &buf[2]);
+    } else if (len >= 10 + mask_len) {
+      msg->header_len = 10 + mask_len;
+      msg->data_len =
+          (size_t) (((uint64_t) mg_ntohl(*(uint32_t *) &buf[2])) << 32) +
+          mg_ntohl(*(uint32_t *) &buf[6]);
+    }
+  }
+  // Sanity check, and integer overflow protection for the boundary check below
+  // data_len should not be larger than 1 Gb
+  if (msg->data_len > 1024 * 1024 * 1024) return 0;
+  if (msg->header_len + msg->data_len > len) return 0;
+  if (mask_len > 0) {
+    uint8_t *p = buf + msg->header_len, *m = p - mask_len;
+    for (i = 0; i < msg->data_len; i++) p[i] ^= m[i & 3];
+  }
+  return msg->header_len + msg->data_len;
+}
+
+static size_t mkhdr(size_t len, int op, bool is_client, uint8_t *buf) {
+  size_t n = 0;
+  buf[0] = (uint8_t) (op | 128);
+  if (len < 126) {
+    buf[1] = (unsigned char) len;
+    n = 2;
+  } else if (len < 65536) {
+    uint16_t tmp = mg_htons((uint16_t) len);
+    buf[1] = 126;
+    memcpy(&buf[2], &tmp, sizeof(tmp));
+    n = 4;
+  } else {
+    uint32_t tmp;
+    buf[1] = 127;
+    tmp = mg_htonl((uint32_t) ((uint64_t) len >> 32));
+    memcpy(&buf[2], &tmp, sizeof(tmp));
+    tmp = mg_htonl((uint32_t) (len & 0xffffffff));
+    memcpy(&buf[6], &tmp, sizeof(tmp));
+    n = 10;
+  }
+  if (is_client) {
+    buf[1] |= 1 << 7;  // Set masking flag
+    mg_random(&buf[n], 4);
+    n += 4;
+  }
+  return n;
 }
 
-void mg_pic32_if_connect_tcp(struct mg_connection *nc,
-                             const union socket_address *sa) {
-  nc->sock = TCPIP_TCP_ClientOpen(
-      sa->sin.sin_family == AF_INET ? IP_ADDRESS_TYPE_IPV4
-                                    : IP_ADDRESS_TYPE_IPV6,
-      ntohs(sa->sin.sin_port), (IP_MULTI_ADDRESS *) &sa->sin);
-  nc->err = (nc->sock == INVALID_SOCKET) ? -1 : 0;
+static void mg_ws_mask(struct mg_connection *c, size_t len) {
+  if (c->is_client && c->send.buf != NULL) {
+    size_t i;
+    uint8_t *p = c->send.buf + c->send.len - len, *mask = p - 4;
+    for (i = 0; i < len; i++) p[i] ^= mask[i & 3];
+  }
 }
 
-void mg_pic32_if_connect_udp(struct mg_connection *nc) {
-  nc->sock = TCPIP_UDP_ClientOpen(IP_ADDRESS_TYPE_ANY, 0, NULL);
-  nc->err = (nc->sock == INVALID_SOCKET) ? -1 : 0;
+size_t mg_ws_send(struct mg_connection *c, const char *buf, size_t len,
+                  int op) {
+  uint8_t header[14];
+  size_t header_len = mkhdr(len, op, c->is_client, header);
+  mg_send(c, header, header_len);
+  LOG(LL_VERBOSE_DEBUG, ("WS out: %d [%.*s]", (int) len, (int) len, buf));
+  mg_send(c, buf, len);
+  mg_ws_mask(c, len);
+  return header_len + len;
 }
 
-/* clang-format off */
-#define MG_PIC32_IFACE_VTABLE                                   \
-  {                                                             \
-    mg_pic32_if_init,                                           \
-    mg_pic32_if_free,                                           \
-    mg_pic32_if_add_conn,                                       \
-    mg_pic32_if_remove_conn,                                    \
-    mg_pic32_if_poll,                                           \
-    mg_pic32_if_listen_tcp,                                     \
-    mg_pic32_if_listen_udp,                                     \
-    mg_pic32_if_connect_tcp,                                    \
-    mg_pic32_if_connect_udp,                                    \
-    mg_pic32_if_tcp_send,                                       \
-    mg_pic32_if_udp_send,                                       \
-    mg_pic32_if_recved,                                         \
-    mg_pic32_if_create_conn,                                    \
-    mg_pic32_if_destroy_conn,                                   \
-    mg_pic32_if_sock_set,                                       \
-    mg_pic32_if_get_conn_addr,                                  \
-  }
-/* clang-format on */
+static void mg_ws_cb(struct mg_connection *c, int ev, void *ev_data,
+                     void *fn_data) {
+  struct ws_msg msg;
+  size_t ofs = (size_t) c->pfn_data;
 
-const struct mg_iface_vtable mg_pic32_iface_vtable = MG_PIC32_IFACE_VTABLE;
-#if MG_NET_IF == MG_NET_IF_PIC32
-const struct mg_iface_vtable mg_default_iface_vtable = MG_PIC32_IFACE_VTABLE;
-#endif
+  // assert(ofs < c->recv.len);
+  if (ev == MG_EV_READ) {
+    if (!c->is_websocket && c->is_client) {
+      int n = mg_http_get_request_len(c->recv.buf, c->recv.len);
+      if (n < 0) {
+        c->is_closing = 1;  // Some just, not an HTTP request
+      } else if (n > 0) {
+        if (n < 15 || memcmp(c->recv.buf + 9, "101", 3) != 0) {
+          LOG(LL_ERROR,
+              ("%lu WS handshake error: %.*s", c->id, 15, c->recv.buf));
+          c->is_closing = 1;
+        } else {
+          struct mg_http_message hm;
+          mg_http_parse((char *) c->recv.buf, c->recv.len, &hm);
+          c->is_websocket = 1;
+          mg_call(c, MG_EV_WS_OPEN, &hm);
+        }
+        mg_iobuf_del(&c->recv, 0, (size_t) n);
+      } else {
+        return;  // A request is not yet received
+      }
+    }
 
-#endif /* MG_ENABLE_NET_IF_PIC32 */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/windows/windows_direct.c"
-#endif
+    while (ws_process(c->recv.buf + ofs, c->recv.len - ofs, &msg) > 0) {
+      char *s = (char *) c->recv.buf + ofs + msg.header_len;
+      struct mg_ws_message m = {{s, msg.data_len}, msg.flags};
+      size_t len = msg.header_len + msg.data_len;
+      uint8_t final = msg.flags & 128, op = msg.flags & 15;
+      // LOG(LL_VERBOSE_DEBUG, ("fin %d op %d len %d [%.*s]", final, op,
+      //                       (int) m.data.len, (int) m.data.len, m.data.ptr));
+      switch (op) {
+        case WEBSOCKET_OP_CONTINUE:
+          mg_call(c, MG_EV_WS_CTL, &m);
+          break;
+        case WEBSOCKET_OP_PING:
+          LOG(LL_DEBUG, ("%s", "WS PONG"));
+          mg_ws_send(c, s, msg.data_len, WEBSOCKET_OP_PONG);
+          mg_call(c, MG_EV_WS_CTL, &m);
+          break;
+        case WEBSOCKET_OP_PONG:
+          mg_call(c, MG_EV_WS_CTL, &m);
+          break;
+        case WEBSOCKET_OP_TEXT:
+        case WEBSOCKET_OP_BINARY:
+          if (final) mg_call(c, MG_EV_WS_MSG, &m);
+          break;
+        case WEBSOCKET_OP_CLOSE:
+          LOG(LL_DEBUG, ("%lu Got WS CLOSE", c->id));
+          mg_call(c, MG_EV_WS_CTL, &m);
+          c->is_closing = 1;
+          break;
+        default:
+          // Per RFC6455, close conn when an unknown op is recvd
+          mg_error(c, "unknown WS op %d", op);
+          break;
+      }
 
-#ifdef _WIN32
+      // Handle fragmented frames: strip header, keep in c->recv
+      if (final == 0 || op == 0) {
+        if (op) ofs++, len--, msg.header_len--;       // First frame
+        mg_iobuf_del(&c->recv, ofs, msg.header_len);  // Strip header
+        len -= msg.header_len;
+        ofs += len;
+        c->pfn_data = (void *) ofs;
+        // LOG(LL_INFO, ("FRAG %d [%.*s]", (int) ofs, (int) ofs, c->recv.buf));
+      }
+      // Remove non-fragmented frame
+      if (final && op) mg_iobuf_del(&c->recv, ofs, len);
+      // Last chunk of the fragmented frame
+      if (final && !op) {
+        m.flags = c->recv.buf[0];
+        m.data = mg_str_n((char *) &c->recv.buf[1], (size_t) (ofs - 1));
+        mg_call(c, MG_EV_WS_MSG, &m);
+        mg_iobuf_del(&c->recv, 0, ofs);
+        ofs = 0;
+        c->pfn_data = NULL;
+      }
+    }
+  }
+  (void) fn_data;
+  (void) ev_data;
+}
 
-int rmdir(const char *dirname) {
-  return _rmdir(dirname);
+struct mg_connection *mg_ws_connect(struct mg_mgr *mgr, const char *url,
+                                    mg_event_handler_t fn, void *fn_data,
+                                    const char *fmt, ...) {
+  struct mg_connection *c = mg_connect(mgr, url, fn, fn_data);
+  if (c != NULL) {
+    char nonce[16], key[30], mem1[128], mem2[256], *buf1 = mem1, *buf2 = mem2;
+    struct mg_str host = mg_url_host(url);
+    int n1 = 0, n2 = 0;
+    if (fmt != NULL) {
+      va_list ap;
+      va_start(ap, fmt);
+      n1 = mg_vasprintf(&buf1, sizeof(mem1), fmt, ap);
+      va_end(ap);
+    }
+    // Send handshake request
+    // mg_url_host(url, host, sizeof(host));
+    mg_random(nonce, sizeof(nonce));
+    mg_base64_encode((unsigned char *) nonce, sizeof(nonce), key);
+    // LOG(LL_DEBUG, "%p [%s]", uri, uri == NULL ? "???" : uri);
+    n2 = mg_asprintf(&buf2, sizeof(mem2),
+                     "GET %s HTTP/1.1\r\n"
+                     "Upgrade: websocket\r\n"
+                     "Host: %.*s\r\n"
+                     "Connection: Upgrade\r\n"
+                     "%.*s"
+                     "Sec-WebSocket-Version: 13\r\n"
+                     "Sec-WebSocket-Key: %s\r\n"
+                     "\r\n",
+                     mg_url_uri(url), (int) host.len, host.ptr, n1, buf1, key);
+    mg_send(c, buf2, n2 > 0 ? (size_t) n2 : 0);
+    if (buf1 != mem1) free(buf1);
+    if (buf2 != mem2) free(buf2);
+    c->pfn = mg_ws_cb;
+    c->pfn_data = NULL;
+  }
+  return c;
 }
 
-unsigned int sleep(unsigned int seconds) {
-  Sleep(seconds * 1000);
-  return 0;
+void mg_ws_upgrade(struct mg_connection *c, struct mg_http_message *hm,
+                   const char *fmt, ...) {
+  struct mg_str *wskey = mg_http_get_header(hm, "Sec-WebSocket-Key");
+  c->pfn = mg_ws_cb;
+  c->pfn_data = NULL;
+  if (wskey == NULL) {
+    mg_http_reply(c, 426, "", "WS upgrade expected\n");
+    c->is_draining = 1;
+  } else {
+    struct mg_str *wsproto = mg_http_get_header(hm, "Sec-WebSocket-Protocol");
+    va_list ap;
+    va_start(ap, fmt);
+    ws_handshake(c, wskey, wsproto, fmt, ap);
+    va_end(ap);
+    c->is_websocket = 1;
+    mg_call(c, MG_EV_WS_OPEN, hm);
+  }
 }
 
-#endif /* _WIN32 */
+size_t mg_ws_wrap(struct mg_connection *c, size_t len, int op) {
+  uint8_t header[14], *p;
+  size_t header_len = mkhdr(len, op, c->is_client, header);
+
+  // NOTE: order of operations is important!
+  mg_iobuf_add(&c->send, c->send.len, NULL, header_len, MG_IO_SIZE);
+  p = &c->send.buf[c->send.len - len];         // p points to data
+  memmove(p, p - header_len, len);             // Shift data
+  memcpy(p - header_len, header, header_len);  // Prepend header
+  mg_ws_mask(c, len);                          // Mask data
+
+  return c->send.len;
+}
diff --git a/mongoose/mongoose.h b/mongoose/mongoose.h
index 6a095cb..1398306 100644
--- a/mongoose/mongoose.h
+++ b/mongoose/mongoose.h
@@ -1,142 +1,58 @@
-/*
- * Copyright (c) 2004-2013 Sergey Lyubka
- * Copyright (c) 2013-2020 Cesanta Software Limited
- * All rights reserved
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- * This software is dual-licensed: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation. For the terms of this
- * license, see <http://www.gnu.org/licenses/>.
- *
- * You are free to use this software under the terms of the GNU General
- * Public License, but WITHOUT ANY WARRANTY; without even the implied
- * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- *
- * Alternatively, you can license this software under a commercial
- * license, as set out in <https://www.cesanta.com/license>.
- */
-
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_common.h"
+// Copyright (c) 2004-2013 Sergey Lyubka
+// Copyright (c) 2013-2021 Cesanta Software Limited
+// All rights reserved
+//
+// This software is dual-licensed: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation. For the terms of this
+// license, see http://www.gnu.org/licenses/
+//
+// You are free to use this software under the terms of the GNU General
+// Public License, but WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// Alternatively, you can license this software under a commercial
+// license, as set out in https://www.mongoose.ws/licensing/
+
+#ifndef MONGOOSE_H
+#define MONGOOSE_H
+
+#define MG_VERSION "7.6"
+
+#ifdef __cplusplus
+extern "C" {
 #endif
-#ifndef CS_MONGOOSE_SRC_COMMON_H_
-#define CS_MONGOOSE_SRC_COMMON_H_
 
-#define MG_VERSION "6.18"
 
-/* Local tweaks, applied before any of Mongoose's own headers. */
-#ifdef MG_LOCALS
-#include <mg_locals.h>
-#endif
+#define MG_ARCH_CUSTOM 0
+#define MG_ARCH_UNIX 1
+#define MG_ARCH_WIN32 2
+#define MG_ARCH_ESP32 3
+#define MG_ARCH_ESP8266 4
+#define MG_ARCH_FREERTOS_TCP 5
+#define MG_ARCH_FREERTOS_LWIP 6
+#define MG_ARCH_AZURERTOS 7
 
-#endif /* CS_MONGOOSE_SRC_COMMON_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platform.h"
-#endif
-#ifndef CS_COMMON_PLATFORM_H_
-#define CS_COMMON_PLATFORM_H_
-
-/*
- * For the "custom" platform, includes and dependencies can be
- * provided through mg_locals.h.
- */
-#define CS_P_CUSTOM 0
-#define CS_P_UNIX 1
-#define CS_P_WINDOWS 2
-#define CS_P_ESP32 15
-#define CS_P_ESP8266 3
-#define CS_P_CC3100 6
-#define CS_P_CC3200 4
-#define CS_P_CC3220 17
-#define CS_P_MSP432 5
-#define CS_P_TM4C129 14
-#define CS_P_MBED 7
-#define CS_P_WINCE 8
-#define CS_P_NXP_LPC 13
-#define CS_P_NXP_KINETIS 9
-#define CS_P_NRF51 12
-#define CS_P_NRF52 10
-#define CS_P_PIC32 11
-#define CS_P_RS14100 18
-#define CS_P_STM32 16
-/* Next id: 19 */
-
-/* If not specified explicitly, we guess platform by defines. */
-#ifndef CS_PLATFORM
-
-#if defined(TARGET_IS_MSP432P4XX) || defined(__MSP432P401R__)
-#define CS_PLATFORM CS_P_MSP432
-#elif defined(cc3200) || defined(TARGET_IS_CC3200)
-#define CS_PLATFORM CS_P_CC3200
-#elif defined(cc3220) || defined(TARGET_IS_CC3220)
-#define CS_PLATFORM CS_P_CC3220
-#elif defined(__unix__) || defined(__APPLE__)
-#define CS_PLATFORM CS_P_UNIX
-#elif defined(WINCE)
-#define CS_PLATFORM CS_P_WINCE
+#if !defined(MG_ARCH)
+#if defined(__unix__) || defined(__APPLE__)
+#define MG_ARCH MG_ARCH_UNIX
 #elif defined(_WIN32)
-#define CS_PLATFORM CS_P_WINDOWS
-#elif defined(__MBED__)
-#define CS_PLATFORM CS_P_MBED
-#elif defined(__USE_LPCOPEN)
-#define CS_PLATFORM CS_P_NXP_LPC
-#elif defined(FRDM_K64F) || defined(FREEDOM)
-#define CS_PLATFORM CS_P_NXP_KINETIS
-#elif defined(PIC32)
-#define CS_PLATFORM CS_P_PIC32
+#define MG_ARCH MG_ARCH_WIN32
+#elif defined(ICACHE_FLASH) || defined(ICACHE_RAM_ATTR)
+#define MG_ARCH MG_ARCH_ESP8266
 #elif defined(ESP_PLATFORM)
-#define CS_PLATFORM CS_P_ESP32
-#elif defined(ICACHE_FLASH)
-#define CS_PLATFORM CS_P_ESP8266
-#elif defined(TARGET_IS_TM4C129_RA0) || defined(TARGET_IS_TM4C129_RA1) || \
-    defined(TARGET_IS_TM4C129_RA2)
-#define CS_PLATFORM CS_P_TM4C129
-#elif defined(RS14100)
-#define CS_PLATFORM CS_P_RS14100
-#elif defined(STM32)
-#define CS_PLATFORM CS_P_STM32
-#endif
-
-#ifndef CS_PLATFORM
-#error "CS_PLATFORM is not specified and we couldn't guess it."
+#define MG_ARCH MG_ARCH_ESP32
+#elif defined(FREERTOS_IP_H)
+#define MG_ARCH MG_ARCH_FREERTOS_TCP
+#elif defined(AZURE_RTOS_THREADX)
+#define MG_ARCH MG_ARCH_AZURERTOS
 #endif
 
-#endif /* !defined(CS_PLATFORM) */
-
-#define MG_NET_IF_SOCKET 1
-#define MG_NET_IF_SIMPLELINK 2
-#define MG_NET_IF_LWIP_LOW_LEVEL 3
-#define MG_NET_IF_PIC32 4
-#define MG_NET_IF_NULL 5
-
-#define MG_SSL_IF_OPENSSL 1
-#define MG_SSL_IF_MBEDTLS 2
-#define MG_SSL_IF_SIMPLELINK 3
-
-/* Amalgamated: #include "common/platforms/platform_unix.h" */
-/* Amalgamated: #include "common/platforms/platform_windows.h" */
-/* Amalgamated: #include "common/platforms/platform_esp32.h" */
-/* Amalgamated: #include "common/platforms/platform_esp8266.h" */
-/* Amalgamated: #include "common/platforms/platform_cc3100.h" */
-/* Amalgamated: #include "common/platforms/platform_cc3200.h" */
-/* Amalgamated: #include "common/platforms/platform_cc3220.h" */
-/* Amalgamated: #include "common/platforms/platform_mbed.h" */
-/* Amalgamated: #include "common/platforms/platform_nrf51.h" */
-/* Amalgamated: #include "common/platforms/platform_nrf52.h" */
-/* Amalgamated: #include "common/platforms/platform_wince.h" */
-/* Amalgamated: #include "common/platforms/platform_nxp_lpc.h" */
-/* Amalgamated: #include "common/platforms/platform_nxp_kinetis.h" */
-/* Amalgamated: #include "common/platforms/platform_pic32.h" */
-/* Amalgamated: #include "common/platforms/platform_rs14100.h" */
-/* Amalgamated: #include "common/platforms/platform_stm32.h" */
-#if CS_PLATFORM == CS_P_CUSTOM
-#include <platform_custom.h>
+#if !defined(MG_ARCH)
+#error "MG_ARCH is not specified and we couldn't guess it."
 #endif
-
-/* Common stuff */
+#endif  // !defined(MG_ARCH)
 
 #if !defined(PRINTF_LIKE)
 #if defined(__GNUC__) || defined(__clang__) || defined(__TI_COMPILER_VERSION__)
@@ -146,6134 +62,1084 @@
 #endif
 #endif
 
-#if !defined(WEAK)
-#if (defined(__GNUC__) || defined(__clang__) || \
-     defined(__TI_COMPILER_VERSION__)) &&       \
-    !defined(_WIN32)
-#define WEAK __attribute__((weak))
-#else
-#define WEAK
-#endif
+#if MG_ARCH == MG_ARCH_CUSTOM
+#include <mongoose_custom.h>
 #endif
 
-#ifdef __GNUC__
-#define NORETURN __attribute__((noreturn))
-#define NOINLINE __attribute__((noinline))
-#define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
-#define NOINSTR __attribute__((no_instrument_function))
-#define DO_NOT_WARN_UNUSED __attribute__((unused))
-#else
-#define NORETURN
-#define NOINLINE
-#define WARN_UNUSED_RESULT
-#define NOINSTR
-#define DO_NOT_WARN_UNUSED
-#endif /* __GNUC__ */
-
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
-#endif
 
-#endif /* CS_COMMON_PLATFORM_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_windows.h"
-#endif
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_WINDOWS_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_WINDOWS_H_
-#if CS_PLATFORM == CS_P_WINDOWS
-
-/*
- * MSVC++ 14.0 _MSC_VER == 1900 (Visual Studio 2015)
- * MSVC++ 12.0 _MSC_VER == 1800 (Visual Studio 2013)
- * MSVC++ 11.0 _MSC_VER == 1700 (Visual Studio 2012)
- * MSVC++ 10.0 _MSC_VER == 1600 (Visual Studio 2010)
- * MSVC++ 9.0  _MSC_VER == 1500 (Visual Studio 2008)
- * MSVC++ 8.0  _MSC_VER == 1400 (Visual Studio 2005)
- * MSVC++ 7.1  _MSC_VER == 1310 (Visual Studio 2003)
- * MSVC++ 7.0  _MSC_VER == 1300
- * MSVC++ 6.0  _MSC_VER == 1200
- * MSVC++ 5.0  _MSC_VER == 1100
- */
-#ifdef _MSC_VER
-#pragma warning(disable : 4127) /* FD_SET() emits warning, disable it */
-#pragma warning(disable : 4204) /* missing c99 support */
-#endif
 
-#ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
-#define _WINSOCK_DEPRECATED_NO_WARNINGS 1
-#endif
 
-#ifndef _CRT_SECURE_NO_WARNINGS
-#define _CRT_SECURE_NO_WARNINGS
-#endif
 
-#include <assert.h>
-#include <direct.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <io.h>
-#include <limits.h>
-#include <signal.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/stat.h>
-#include <time.h>
-#include <ctype.h>
 
-#ifdef _MSC_VER
-#pragma comment(lib, "ws2_32.lib") /* Linking with winsock library */
-#endif
 
-#include <winsock2.h>
-#include <ws2tcpip.h>
-#include <windows.h>
-#include <process.h>
 
-#if defined(_MSC_VER) && (_MSC_VER < 1700)
-typedef int bool;
-#else
-#include <stdbool.h>
-#endif
 
-#if defined(_MSC_VER) && _MSC_VER >= 1800
-#define strdup _strdup
-#endif
+#if MG_ARCH == MG_ARCH_AZURERTOS
 
-#ifndef EINPROGRESS
-#define EINPROGRESS WSAEINPROGRESS
-#endif
-#ifndef EWOULDBLOCK
-#define EWOULDBLOCK WSAEWOULDBLOCK
-#endif
-#ifndef __func__
-#define STRX(x) #x
-#define STR(x) STRX(x)
-#define __func__ __FILE__ ":" STR(__LINE__)
-#endif
-#define snprintf _snprintf
-#define vsnprintf _vsnprintf
-#define to64(x) _atoi64(x)
-#if !defined(__MINGW32__) && !defined(__MINGW64__)
-#define popen(x, y) _popen((x), (y))
-#define pclose(x) _pclose(x)
-#define fileno _fileno
-#endif
-#if defined(_MSC_VER) && _MSC_VER >= 1400
-#define fseeko(x, y, z) _fseeki64((x), (y), (z))
-#else
-#define fseeko(x, y, z) fseek((x), (y), (z))
-#endif
-#if defined(_MSC_VER) && _MSC_VER <= 1200
-typedef unsigned long uintptr_t;
-typedef long intptr_t;
-#endif
-typedef int socklen_t;
-#if _MSC_VER >= 1700
+#include <stdarg.h>
+#include <stdbool.h>
 #include <stdint.h>
-#else
-typedef signed char int8_t;
-typedef unsigned char uint8_t;
-typedef int int32_t;
-typedef unsigned int uint32_t;
-typedef short int16_t;
-typedef unsigned short uint16_t;
-typedef __int64 int64_t;
-typedef unsigned __int64 uint64_t;
-#endif
-typedef SOCKET sock_t;
-typedef uint32_t in_addr_t;
-#ifndef UINT16_MAX
-#define UINT16_MAX 65535
-#endif
-#ifndef UINT32_MAX
-#define UINT32_MAX 4294967295
-#endif
-#ifndef pid_t
-#define pid_t HANDLE
-#endif
-#define INT64_FMT "I64d"
-#define INT64_X_FMT "I64x"
-#define SIZE_T_FMT "Iu"
-typedef struct _stati64 cs_stat_t;
-#ifndef S_ISDIR
-#define S_ISDIR(x) (((x) &_S_IFMT) == _S_IFDIR)
-#endif
-#ifndef S_ISREG
-#define S_ISREG(x) (((x) &_S_IFMT) == _S_IFREG)
-#endif
-#define DIRSEP '\\'
-#define CS_DEFINE_DIRENT
-
-#ifndef va_copy
-#ifdef __va_copy
-#define va_copy __va_copy
-#else
-#define va_copy(x, y) (x) = (y)
-#endif
-#endif
-
-#ifndef MG_MAX_HTTP_REQUEST_SIZE
-#define MG_MAX_HTTP_REQUEST_SIZE 8192
-#endif
+#include <stdio.h>
+#include <time.h>
 
-#ifndef MG_MAX_HTTP_SEND_MBUF
-#define MG_MAX_HTTP_SEND_MBUF 4096
-#endif
+#include <fx_api.h>
+#include <tx_api.h>
 
-#ifndef MG_MAX_HTTP_HEADERS
-#define MG_MAX_HTTP_HEADERS 40
-#endif
+#include <nx_api.h>
+#include <nx_bsd.h>
+#include <nx_port.h>
+#include <tx_port.h>
 
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
+#ifdef __REDLIB__
+#define va_copy(d, s) __builtin_va_copy(d, s)
 #endif
 
-#ifndef MG_ENABLE_BROADCAST
-#define MG_ENABLE_BROADCAST 1
-#endif
+#define PATH_MAX FX_MAXIMUM_PATH
+#define MG_DIRSEP '\\'
 
-#ifndef MG_ENABLE_DIRECTORY_LISTING
-#define MG_ENABLE_DIRECTORY_LISTING 1
-#endif
+#define socklen_t int
+#define closesocket(x) soc_close(x)
+#define gmtime_r(a, b) gmtime(a)
+#define MG_INT64_FMT "%lld"
 
-#ifndef MG_ENABLE_FILESYSTEM
-#define MG_ENABLE_FILESYSTEM 1
-#endif
+static __inline struct tm *localtime_r(const time_t *t, struct tm *tm) {
+  struct tm *x = localtime(t);
+  *tm = *x;
+  return tm;
+}
 
-#ifndef MG_ENABLE_HTTP_CGI
-#define MG_ENABLE_HTTP_CGI MG_ENABLE_FILESYSTEM
-#endif
+#undef FOPEN_MAX
 
-#ifndef MG_NET_IF
-#define MG_NET_IF MG_NET_IF_SOCKET
 #endif
 
-unsigned int sleep(unsigned int seconds);
-
-/* https://stackoverflow.com/questions/16647819/timegm-cross-platform */
-#define timegm _mkgmtime
 
-#define gmtime_r(a, b) \
-  do {                 \
-    *(b) = *gmtime(a); \
-  } while (0)
-
-#endif /* CS_PLATFORM == CS_P_WINDOWS */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_WINDOWS_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_unix.h"
-#endif
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_UNIX_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_UNIX_H_
-#if CS_PLATFORM == CS_P_UNIX
+#if MG_ARCH == MG_ARCH_ESP32
 
-#ifndef _XOPEN_SOURCE
-#define _XOPEN_SOURCE 600
-#endif
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <netdb.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
 
-/* <inttypes.h> wants this for C++ */
-#ifndef __STDC_FORMAT_MACROS
-#define __STDC_FORMAT_MACROS
-#endif
+#define MG_PATH_MAX 128
+#define MG_ENABLE_DIRLIST 1
 
-/* C++ wants that for INT64_MAX */
-#ifndef __STDC_LIMIT_MACROS
-#define __STDC_LIMIT_MACROS
 #endif
 
-/* Enable fseeko() and ftello() functions */
-#ifndef _LARGEFILE_SOURCE
-#define _LARGEFILE_SOURCE
-#endif
 
-/* Enable 64-bit file offsets */
-#ifndef _FILE_OFFSET_BITS
-#define _FILE_OFFSET_BITS 64
-#endif
+#if MG_ARCH == MG_ARCH_ESP8266
 
-#include <arpa/inet.h>
-#include <assert.h>
 #include <ctype.h>
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <inttypes.h>
-#include <stdint.h>
 #include <limits.h>
-#include <math.h>
 #include <netdb.h>
-#include <netinet/in.h>
-#include <pthread.h>
-#include <signal.h>
 #include <stdarg.h>
 #include <stdbool.h>
+#include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/param.h>
-#include <sys/socket.h>
-#include <sys/select.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
-#include <unistd.h>
-
-#ifdef __APPLE__
-#include <machine/endian.h>
-#ifndef BYTE_ORDER
-#define LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN
-#define BIG_ENDIAN __DARWIN_BIG_ENDIAN
-#define PDP_ENDIAN __DARWIN_PDP_ENDIAN
-#define BYTE_ORDER __DARWIN_BYTE_ORDER
-#endif
-#endif
+#include <time.h>
 
-/*
- * osx correctly avoids defining strtoll when compiling in strict ansi mode.
- * c++ 11 standard defines strtoll as well.
- * We require strtoll, and if your embedded pre-c99 compiler lacks one, please
- * implement a shim.
- */
-#if !(defined(__cplusplus) && __cplusplus >= 201103L) && \
-    !(defined(__DARWIN_C_LEVEL) && __DARWIN_C_LEVEL >= 200809L)
-long long strtoll(const char *, char **, int);
-#endif
+#include <esp_system.h>
 
-typedef int sock_t;
-#define INVALID_SOCKET (-1)
-#define SIZE_T_FMT "zu"
-typedef struct stat cs_stat_t;
-#define DIRSEP '/'
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT PRId64
-#define INT64_X_FMT PRIx64
-
-#ifndef __cdecl
-#define __cdecl
-#endif
+#define MG_PATH_MAX 128
+#define MG_ENABLE_DIRLIST 1
 
-#ifndef va_copy
-#ifdef __va_copy
-#define va_copy __va_copy
-#else
-#define va_copy(x, y) (x) = (y)
 #endif
-#endif
-
-#define closesocket(x) close(x)
 
-#ifndef MG_MAX_HTTP_REQUEST_SIZE
-#define MG_MAX_HTTP_REQUEST_SIZE 8192
-#endif
 
-#ifndef MG_MAX_HTTP_SEND_MBUF
-#define MG_MAX_HTTP_SEND_MBUF 4096
-#endif
+#if MG_ARCH == MG_ARCH_FREERTOS_LWIP
 
-#ifndef MG_MAX_HTTP_HEADERS
-#define MG_MAX_HTTP_HEADERS 40
-#endif
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
 
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
+#if defined(__GNUC__)
+#include <sys/stat.h>
+#include <sys/time.h>
+#else
+struct timeval {
+  time_t tv_sec;
+  long tv_usec;
+};
 #endif
 
-#ifndef MG_ENABLE_BROADCAST
-#define MG_ENABLE_BROADCAST 1
-#endif
+#include <FreeRTOS.h>
+#include <task.h>
 
-#ifndef MG_ENABLE_DIRECTORY_LISTING
-#define MG_ENABLE_DIRECTORY_LISTING 1
-#endif
+#include <lwip/sockets.h>
 
-#ifndef MG_ENABLE_FILESYSTEM
-#define MG_ENABLE_FILESYSTEM 1
+#if LWIP_SOCKET != 1
+// Sockets support disabled in LWIP by default
+#error Set LWIP_SOCKET variable to 1 (in lwipopts.h)
 #endif
 
-#ifndef MG_ENABLE_HTTP_CGI
-#define MG_ENABLE_HTTP_CGI MG_ENABLE_FILESYSTEM
+#if LWIP_POSIX_SOCKETS_IO_NAMES != 0
+// LWIP_POSIX_SOCKETS_IO_NAMES must be disabled in posix-compatible OS
+// enviroment (freertos mimics to one) otherwise names like `read` and `write`
+// conflict
+#error LWIP_POSIX_SOCKETS_IO_NAMES must be set to 0 (in lwipopts.h) for FreeRTOS
 #endif
 
-#ifndef MG_NET_IF
-#define MG_NET_IF MG_NET_IF_SOCKET
-#endif
+#define MG_INT64_FMT "%lld"
+#define MG_DIRSEP '/'
 
-#ifndef MG_HOSTS_FILE_NAME
-#define MG_HOSTS_FILE_NAME "/etc/hosts"
-#endif
+// Re-route calloc/free to the FreeRTOS's functions, don't use stdlib
+static inline void *mg_calloc(int cnt, size_t size) {
+  void *p = pvPortMalloc(cnt * size);
+  if (p != NULL) memset(p, 0, size);
+  return p;
+}
+#define calloc(a, b) mg_calloc((a), (b))
+#define free(a) vPortFree(a)
+#define malloc(a) pvPortMalloc(a)
+#define gmtime_r(a, b) gmtime(a)
+#define mkdir(a, b) (-1)
 
-#ifndef MG_RESOLV_CONF_FILE_NAME
-#define MG_RESOLV_CONF_FILE_NAME "/etc/resolv.conf"
-#endif
+#endif  // MG_ARCH == MG_ARCH_FREERTOS_LWIP
 
-#endif /* CS_PLATFORM == CS_P_UNIX */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_UNIX_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_esp32.h"
-#endif
 
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_ESP32_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_ESP32_H_
-#if CS_PLATFORM == CS_P_ESP32
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
 
-#include <assert.h>
 #include <ctype.h>
-#include <dirent.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <machine/endian.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdarg.h>
 #include <stdbool.h>
-#include <stdint.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
-#include <sys/time.h>
-
-#define SIZE_T_FMT "u"
-typedef struct stat cs_stat_t;
-#define DIRSEP '/'
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT PRId64
-#define INT64_X_FMT PRIx64
-#define __cdecl
-#define _FILE_OFFSET_BITS 32
+#include <time.h>
 
-#define MG_LWIP 1
+#include <FreeRTOS.h>
+#include <FreeRTOS_IP.h>
+#include <FreeRTOS_Sockets.h>
+#include <task.h>
+
+// Why FreeRTOS-TCP did not implement a clean BSD API, but its own thing
+// with FreeRTOS_ prefix, is beyond me
+#define IPPROTO_TCP FREERTOS_IPPROTO_TCP
+#define IPPROTO_UDP FREERTOS_IPPROTO_UDP
+#define AF_INET FREERTOS_AF_INET
+#define SOCK_STREAM FREERTOS_SOCK_STREAM
+#define SOCK_DGRAM FREERTOS_SOCK_DGRAM
+#define SO_BROADCAST 0
+#define SO_ERROR 0
+#define SOL_SOCKET 0
+#define SO_REUSEADDR 0
+#define sockaddr_in freertos_sockaddr
+#define sockaddr freertos_sockaddr
+#define accept(a, b, c) FreeRTOS_accept((a), (b), (c))
+#define connect(a, b, c) FreeRTOS_connect((a), (b), (c))
+#define bind(a, b, c) FreeRTOS_bind((a), (b), (c))
+#define listen(a, b) FreeRTOS_listen((a), (b))
+#define socket(a, b, c) FreeRTOS_socket((a), (b), (c))
+#define send(a, b, c, d) FreeRTOS_send((a), (b), (c), (d))
+#define recv(a, b, c, d) FreeRTOS_recv((a), (b), (c), (d))
+#define setsockopt(a, b, c, d, e) FreeRTOS_setsockopt((a), (b), (c), (d), (e))
+#define sendto(a, b, c, d, e, f) FreeRTOS_sendto((a), (b), (c), (d), (e), (f))
+#define recvfrom(a, b, c, d, e, f) \
+  FreeRTOS_recvfrom((a), (b), (c), (d), (e), (f))
+#define closesocket(x) FreeRTOS_closesocket(x)
+#define gethostbyname(x) FreeRTOS_gethostbyname(x)
+#define getsockname(a, b, c) (-1)
+
+// Re-route calloc/free to the FreeRTOS's functions, don't use stdlib
+static inline void *mg_calloc(int cnt, size_t size) {
+  void *p = pvPortMalloc(cnt * size);
+  if (p != NULL) memset(p, 0, size);
+  return p;
+}
+#define calloc(a, b) mg_calloc((a), (b))
+#define free(a) vPortFree(a)
+#define malloc(a) pvPortMalloc(a)
+#define mkdir(a, b) (-1)
 
-#ifndef MG_NET_IF
-#define MG_NET_IF MG_NET_IF_SOCKET
-#endif
+#define gmtime_r(a, b) gmtime(a)
 
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
+#if !defined(__GNUC__)
+// copied from GCC on ARM; for some reason useconds are signed
+struct timeval {
+  time_t tv_sec;
+  long tv_usec;
+};
 #endif
 
-#endif /* CS_PLATFORM == CS_P_ESP32 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_ESP32_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_esp8266.h"
+#ifndef EINPROGRESS
+#define EINPROGRESS pdFREERTOS_ERRNO_EINPROGRESS
 #endif
-
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_ESP8266_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_ESP8266_H_
-#if CS_PLATFORM == CS_P_ESP8266
-
-#include <assert.h>
-#include <ctype.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <machine/endian.h>
-#include <stdbool.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-
-#define SIZE_T_FMT "u"
-typedef struct stat cs_stat_t;
-#define DIRSEP '/'
-#if !defined(MGOS_VFS_DEFINE_DIRENT)
-#define CS_DEFINE_DIRENT
+#ifndef EWOULDBLOCK
+#define EWOULDBLOCK pdFREERTOS_ERRNO_EWOULDBLOCK
 #endif
-
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT PRId64
-#define INT64_X_FMT PRIx64
-#define __cdecl
-#define _FILE_OFFSET_BITS 32
-
-#define MG_LWIP 1
-
-/* struct timeval is defined in sys/time.h. */
-#define LWIP_TIMEVAL_PRIVATE 0
-
-#ifndef MG_NET_IF
-#include <lwip/opt.h>
-#if LWIP_SOCKET /* RTOS SDK has LWIP sockets */
-#define MG_NET_IF MG_NET_IF_SOCKET
-#else
-#define MG_NET_IF MG_NET_IF_LWIP_LOW_LEVEL
+#ifndef EAGAIN
+#define EAGAIN pdFREERTOS_ERRNO_EAGAIN
 #endif
+#ifndef EINTR
+#define EINTR pdFREERTOS_ERRNO_EINTR
 #endif
 
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
-#endif
+#endif  // MG_ARCH == MG_ARCH_FREERTOS_TCP
 
-#define inet_ntop(af, src, dst, size)                                          \
-  (((af) == AF_INET) ? ipaddr_ntoa_r((const ip_addr_t *) (src), (dst), (size)) \
-                     : NULL)
-#define inet_pton(af, src, dst) \
-  (((af) == AF_INET) ? ipaddr_aton((src), (ip_addr_t *) (dst)) : 0)
 
-#endif /* CS_PLATFORM == CS_P_ESP8266 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_ESP8266_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_cc3100.h"
-#endif
+#if MG_ARCH == MG_ARCH_UNIX
 
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_CC3100_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_CC3100_H_
-#if CS_PLATFORM == CS_P_CC3100
+#define _DARWIN_UNLIMITED_SELECT 1  // No limit on file descriptors
 
-#include <assert.h>
+#include <arpa/inet.h>
 #include <ctype.h>
+#include <dirent.h>
 #include <errno.h>
+#include <fcntl.h>
 #include <inttypes.h>
+#include <limits.h>
+#include <netdb.h>
+#include <netinet/tcp.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
 #include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
+#include <sys/select.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
 #include <time.h>
+#include <unistd.h>
 
-#define MG_NET_IF MG_NET_IF_SIMPLELINK
-#define MG_SSL_IF MG_SSL_IF_SIMPLELINK
-
-/*
- * CC3100 SDK and STM32 SDK include headers w/out path, just like
- * #include "simplelink.h". As result, we have to add all required directories
- * into Makefile IPATH and do the same thing (include w/out path)
- */
+#define MG_INT64_FMT "%" PRId64
 
-#include <simplelink.h>
-#include <netapp.h>
-#undef timeval
+#ifndef MG_ENABLE_DIRLIST
+#define MG_ENABLE_DIRLIST 1
+#endif
 
-typedef int sock_t;
-#define INVALID_SOCKET (-1)
+#endif
 
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT PRId64
-#define INT64_X_FMT PRIx64
-#define SIZE_T_FMT "u"
 
-#define SOMAXCONN 8
+#if MG_ARCH == MG_ARCH_WIN32
 
-const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
-char *inet_ntoa(struct in_addr in);
-int inet_pton(int af, const char *src, void *dst);
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
 
-#endif /* CS_PLATFORM == CS_P_CC3100 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_CC3100_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_cc3200.h"
+#ifndef _CRT_SECURE_NO_WARNINGS
+#define _CRT_SECURE_NO_WARNINGS
 #endif
 
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_CC3200_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_CC3200_H_
-#if CS_PLATFORM == CS_P_CC3200
+#ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
+#define _WINSOCK_DEPRECATED_NO_WARNINGS
+#endif
 
-#include <assert.h>
 #include <ctype.h>
+#include <direct.h>
 #include <errno.h>
-#include <inttypes.h>
-#include <stdbool.h>
-#include <stdint.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
 #include <time.h>
 
-#ifndef __TI_COMPILER_VERSION__
-#include <fcntl.h>
-#include <sys/time.h>
+#if defined(_MSC_VER) && _MSC_VER < 1700
+#define __func__ ""
+typedef __int64 int64_t;
+typedef unsigned __int64 uint64_t;
+typedef unsigned char uint8_t;
+typedef char int8_t;
+typedef unsigned short uint16_t;
+typedef short int16_t;
+typedef unsigned int uint32_t;
+typedef int int32_t;
+typedef enum { false = 0, true = 1 } bool;
+#else
+#include <stdbool.h>
+#include <stdint.h>
+#include <ws2tcpip.h>
 #endif
 
-#define MG_NET_IF MG_NET_IF_SIMPLELINK
-#define MG_SSL_IF MG_SSL_IF_SIMPLELINK
+#include <winsock2.h>
 
-/* Only SPIFFS supports directories, SLFS does not. */
-#if defined(CC3200_FS_SPIFFS) && !defined(MG_ENABLE_DIRECTORY_LISTING)
-#define MG_ENABLE_DIRECTORY_LISTING 1
+// Protect from calls like std::snprintf in app code
+// See https://github.com/cesanta/mongoose/issues/1047
+#ifndef __cplusplus
+#define snprintf _snprintf
+#define vsnprintf _vsnprintf
+#ifndef strdup  // For MSVC with _DEBUG, see #1359
+#define strdup(x) _strdup(x)
 #endif
-
-/* Amalgamated: #include "common/platforms/simplelink/cs_simplelink.h" */
-
-typedef int sock_t;
-#define INVALID_SOCKET (-1)
-#define SIZE_T_FMT "u"
-typedef struct stat cs_stat_t;
-#define DIRSEP '/'
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT PRId64
-#define INT64_X_FMT PRIx64
-#define __cdecl
-
-#define fileno(x) -1
-
-/* Some functions we implement for Mongoose. */
-
-#ifdef __cplusplus
-extern "C" {
 #endif
 
-#ifdef __TI_COMPILER_VERSION__
-struct SlTimeval_t;
-#define timeval SlTimeval_t
-int gettimeofday(struct timeval *t, void *tz);
-int settimeofday(const struct timeval *tv, const void *tz);
-
-int asprintf(char **strp, const char *fmt, ...);
-
-#endif
-
-/* TI's libc does not have stat & friends, add them. */
-#ifdef __TI_COMPILER_VERSION__
-
-#include <file.h>
-
-typedef unsigned int mode_t;
-typedef size_t _off_t;
-typedef long ssize_t;
-
-struct stat {
-  int st_ino;
-  mode_t st_mode;
-  int st_nlink;
-  time_t st_mtime;
-  off_t st_size;
-};
-
-int _stat(const char *pathname, struct stat *st);
-int stat(const char *pathname, struct stat *st);
-
-#define __S_IFMT 0170000
-
-#define __S_IFDIR 0040000
-#define __S_IFCHR 0020000
-#define __S_IFREG 0100000
-
-#define __S_ISTYPE(mode, mask) (((mode) &__S_IFMT) == (mask))
-
-#define S_IFDIR __S_IFDIR
-#define S_IFCHR __S_IFCHR
-#define S_IFREG __S_IFREG
-#define S_ISDIR(mode) __S_ISTYPE((mode), __S_IFDIR)
-#define S_ISREG(mode) __S_ISTYPE((mode), __S_IFREG)
-
-/* 5.x series compilers don't have va_copy, 16.x do. */
-#if __TI_COMPILER_VERSION__ < 16000000
-#define va_copy(apc, ap) ((apc) = (ap))
-#endif
-
-#endif /* __TI_COMPILER_VERSION__ */
-
-#ifdef CC3200_FS_SLFS
-#define MG_FS_SLFS
-#endif
-
-#if (defined(CC3200_FS_SPIFFS) || defined(CC3200_FS_SLFS)) && \
-    !defined(MG_ENABLE_FILESYSTEM)
-#define MG_ENABLE_FILESYSTEM 1
-#define CS_DEFINE_DIRENT
-#endif
-
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* CS_PLATFORM == CS_P_CC3200 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_CC3200_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_cc3220.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_CC3220_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_CC3220_H_
-#if CS_PLATFORM == CS_P_CC3220
-
-#include <assert.h>
-#include <ctype.h>
-#include <errno.h>
-#include <inttypes.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
-#include <time.h>
-
-#ifndef __TI_COMPILER_VERSION__
-#include <fcntl.h>
-#include <sys/time.h>
-#endif
-
-#define MG_NET_IF MG_NET_IF_SIMPLELINK
-#ifndef MG_SSL_IF
-#define MG_SSL_IF MG_SSL_IF_SIMPLELINK
-#endif
-
-/* Only SPIFFS supports directories, SLFS does not. */
-#if defined(CC3220_FS_SPIFFS) && !defined(MG_ENABLE_DIRECTORY_LISTING)
-#define MG_ENABLE_DIRECTORY_LISTING 1
-#endif
-
-/* Amalgamated: #include "common/platforms/simplelink/cs_simplelink.h" */
-
-typedef int sock_t;
-#define INVALID_SOCKET (-1)
-#define SIZE_T_FMT "u"
-typedef struct stat cs_stat_t;
-#define DIRSEP '/'
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT PRId64
-#define INT64_X_FMT PRIx64
-#define __cdecl
-
-#define fileno(x) -1
-
-/* Some functions we implement for Mongoose. */
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifdef __TI_COMPILER_VERSION__
-struct SlTimeval_t;
-#define timeval SlTimeval_t
-int gettimeofday(struct timeval *t, void *tz);
-int settimeofday(const struct timeval *tv, const void *tz);
-
-int asprintf(char **strp, const char *fmt, ...);
-
-#endif
-
-/* TI's libc does not have stat & friends, add them. */
-#ifdef __TI_COMPILER_VERSION__
-
-#include <file.h>
-
-typedef unsigned int mode_t;
-typedef size_t _off_t;
-typedef long ssize_t;
-
-struct stat {
-  int st_ino;
-  mode_t st_mode;
-  int st_nlink;
-  time_t st_mtime;
-  off_t st_size;
-};
-
-int _stat(const char *pathname, struct stat *st);
-int stat(const char *pathname, struct stat *st);
-
-#define __S_IFMT 0170000
-
-#define __S_IFDIR 0040000
-#define __S_IFCHR 0020000
-#define __S_IFREG 0100000
-
-#define __S_ISTYPE(mode, mask) (((mode) &__S_IFMT) == (mask))
-
-#define S_IFDIR __S_IFDIR
-#define S_IFCHR __S_IFCHR
-#define S_IFREG __S_IFREG
-#define S_ISDIR(mode) __S_ISTYPE((mode), __S_IFDIR)
-#define S_ISREG(mode) __S_ISTYPE((mode), __S_IFREG)
-
-#endif /* __TI_COMPILER_VERSION__ */
-
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* CS_PLATFORM == CS_P_CC3220 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_CC3200_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_msp432.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_MSP432_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_MSP432_H_
-#if CS_PLATFORM == CS_P_MSP432
-
-#include <assert.h>
-#include <ctype.h>
-#include <errno.h>
-#include <inttypes.h>
-#include <stdint.h>
-#include <string.h>
-#include <time.h>
-
-#ifndef __TI_COMPILER_VERSION__
-#include <fcntl.h>
-#include <sys/time.h>
-#endif
-
-#define MG_NET_IF MG_NET_IF_SIMPLELINK
-#define MG_SSL_IF MG_SSL_IF_SIMPLELINK
-
-/* Amalgamated: #include "common/platforms/simplelink/cs_simplelink.h" */
-
-typedef int sock_t;
-#define INVALID_SOCKET (-1)
-#define SIZE_T_FMT "u"
-typedef struct stat cs_stat_t;
-#define DIRSEP '/'
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT PRId64
-#define INT64_X_FMT PRIx64
-#define __cdecl
-
-#define fileno(x) -1
-
-/* Some functions we implement for Mongoose. */
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifdef __TI_COMPILER_VERSION__
-struct SlTimeval_t;
-#define timeval SlTimeval_t
-int gettimeofday(struct timeval *t, void *tz);
-#endif
-
-/* TI's libc does not have stat & friends, add them. */
-#ifdef __TI_COMPILER_VERSION__
-
-#include <file.h>
-
-typedef unsigned int mode_t;
-typedef size_t _off_t;
-typedef long ssize_t;
-
-struct stat {
-  int st_ino;
-  mode_t st_mode;
-  int st_nlink;
-  time_t st_mtime;
-  off_t st_size;
-};
-
-int _stat(const char *pathname, struct stat *st);
-#define stat(a, b) _stat(a, b)
-
-#define __S_IFMT 0170000
-
-#define __S_IFDIR 0040000
-#define __S_IFCHR 0020000
-#define __S_IFREG 0100000
-
-#define __S_ISTYPE(mode, mask) (((mode) &__S_IFMT) == (mask))
-
-#define S_IFDIR __S_IFDIR
-#define S_IFCHR __S_IFCHR
-#define S_IFREG __S_IFREG
-#define S_ISDIR(mode) __S_ISTYPE((mode), __S_IFDIR)
-#define S_ISREG(mode) __S_ISTYPE((mode), __S_IFREG)
-
-/* As of 5.2.7, TI compiler does not support va_copy() yet. */
-#define va_copy(apc, ap) ((apc) = (ap))
-
-#endif /* __TI_COMPILER_VERSION__ */
-
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
-#endif
-
-#if (defined(CC3200_FS_SPIFFS) || defined(CC3200_FS_SLFS)) && \
-    !defined(MG_ENABLE_FILESYSTEM)
-#define MG_ENABLE_FILESYSTEM 1
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* CS_PLATFORM == CS_P_MSP432 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_MSP432_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_tm4c129.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_TM4C129_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_TM4C129_H_
-#if CS_PLATFORM == CS_P_TM4C129
-
-#include <assert.h>
-#include <ctype.h>
-#include <errno.h>
-#include <inttypes.h>
-#include <stdint.h>
-#include <string.h>
-#include <time.h>
-
-#ifndef __TI_COMPILER_VERSION__
-#include <fcntl.h>
-#include <sys/time.h>
-#endif
-
-#define SIZE_T_FMT "u"
-typedef struct stat cs_stat_t;
-#define DIRSEP '/'
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT PRId64
-#define INT64_X_FMT PRIx64
-#define __cdecl
-
-#ifndef MG_NET_IF
-#include <lwip/opt.h>
-#if LWIP_SOCKET
-#define MG_NET_IF MG_NET_IF_SOCKET
-#else
-#define MG_NET_IF MG_NET_IF_LWIP_LOW_LEVEL
-#endif
-#define MG_LWIP 1
-#elif MG_NET_IF == MG_NET_IF_SIMPLELINK
-/* Amalgamated: #include "common/platforms/simplelink/cs_simplelink.h" */
-#endif
-
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
-#endif
-
-#ifdef __TI_COMPILER_VERSION__
-/* As of 5.2.8, TI compiler does not support va_copy() yet. */
-#define va_copy(apc, ap) ((apc) = (ap))
-#endif /* __TI_COMPILER_VERSION__ */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* CS_PLATFORM == CS_P_TM4C129 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_TM4C129_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_mbed.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_MBED_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_MBED_H_
-#if CS_PLATFORM == CS_P_MBED
-
-/*
- * mbed.h contains C++ code (e.g. templates), thus, it should be processed
- * only if included directly to startup file (ex: main.cpp)
- */
-#ifdef __cplusplus
-/* Amalgamated: #include "mbed.h" */
-#endif /* __cplusplus */
-
-#include <assert.h>
-#include <ctype.h>
-#include <errno.h>
-#include <inttypes.h>
-#include <stdint.h>
-#include <string.h>
-#include <time.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <fcntl.h>
-#include <stdio.h>
-
-typedef struct stat cs_stat_t;
-#define DIRSEP '/'
-
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
-#endif
-
-/*
- * mbed can be compiled with the ARM compiler which
- * just doesn't come with a gettimeofday shim
- * because it's a BSD API and ARM targets embedded
- * non-unix platforms.
- */
-#if defined(__ARMCC_VERSION) || defined(__ICCARM__)
-#define _TIMEVAL_DEFINED
-#define gettimeofday _gettimeofday
-
-/* copied from GCC on ARM; for some reason useconds are signed */
-typedef long suseconds_t; /* microseconds (signed) */
-struct timeval {
-  time_t tv_sec;       /* seconds */
-  suseconds_t tv_usec; /* and microseconds */
-};
-
-#endif
-
-#if MG_NET_IF == MG_NET_IF_SIMPLELINK
-
-#define MG_SIMPLELINK_NO_OSI 1
-
-#include <simplelink.h>
-
-typedef int sock_t;
-#define INVALID_SOCKET (-1)
-
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT PRId64
-#define INT64_X_FMT PRIx64
-#define SIZE_T_FMT "u"
-
-#define SOMAXCONN 8
-
-const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
-char *inet_ntoa(struct in_addr in);
-int inet_pton(int af, const char *src, void *dst);
-int inet_aton(const char *cp, struct in_addr *inp);
-in_addr_t inet_addr(const char *cp);
-
-#endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK */
-
-#endif /* CS_PLATFORM == CS_P_MBED */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_MBED_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_nrf51.h"
-#endif
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_NRF51_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_NRF51_H_
-#if CS_PLATFORM == CS_P_NRF51
-
-#include <assert.h>
-#include <ctype.h>
-#include <inttypes.h>
-#include <stdint.h>
-#include <string.h>
-#include <time.h>
-
-#define to64(x) strtoll(x, NULL, 10)
-
-#define MG_NET_IF MG_NET_IF_LWIP_LOW_LEVEL
-#define MG_LWIP 1
-#define MG_ENABLE_IPV6 1
-
-/*
- * For ARM C Compiler, make lwip to export `struct timeval`; for other
- * compilers, suppress it.
- */
-#if !defined(__ARMCC_VERSION)
-#define LWIP_TIMEVAL_PRIVATE 0
-#else
-struct timeval;
-int gettimeofday(struct timeval *tp, void *tzp);
-#endif
-
-#define INT64_FMT PRId64
-#define SIZE_T_FMT "u"
-
-/*
- * ARM C Compiler doesn't have strdup, so we provide it
- */
-#define CS_ENABLE_STRDUP defined(__ARMCC_VERSION)
-
-#endif /* CS_PLATFORM == CS_P_NRF51 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_NRF51_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_nrf52.h"
-#endif
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_NRF52_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_NRF52_H_
-#if CS_PLATFORM == CS_P_NRF52
-
-#include <assert.h>
-#include <ctype.h>
-#include <errno.h>
-#include <inttypes.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
-#include <time.h>
-
-#define to64(x) strtoll(x, NULL, 10)
-
-#define MG_NET_IF MG_NET_IF_LWIP_LOW_LEVEL
-#define MG_LWIP 1
-#define MG_ENABLE_IPV6 1
-
-#if !defined(ENOSPC)
-#define ENOSPC 28 /* No space left on device */
-#endif
-
-/*
- * For ARM C Compiler, make lwip to export `struct timeval`; for other
- * compilers, suppress it.
- */
-#if !defined(__ARMCC_VERSION)
-#define LWIP_TIMEVAL_PRIVATE 0
-#endif
-
-#define INT64_FMT PRId64
-#define SIZE_T_FMT "u"
-
-/*
- * ARM C Compiler doesn't have strdup, so we provide it
- */
-#define CS_ENABLE_STRDUP defined(__ARMCC_VERSION)
-
-#endif /* CS_PLATFORM == CS_P_NRF52 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_NRF52_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/simplelink/cs_simplelink.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_SIMPLELINK_CS_SIMPLELINK_H_
-#define CS_COMMON_PLATFORMS_SIMPLELINK_CS_SIMPLELINK_H_
-
-#if defined(MG_NET_IF) && MG_NET_IF == MG_NET_IF_SIMPLELINK
-
-/* If simplelink.h is already included, all bets are off. */
-#if !defined(__SIMPLELINK_H__)
-
-#include <stdbool.h>
-
-#ifndef __TI_COMPILER_VERSION__
-#undef __CONCAT
-#undef FD_CLR
-#undef FD_ISSET
-#undef FD_SET
-#undef FD_SETSIZE
-#undef FD_ZERO
-#undef fd_set
-#endif
-
-#if CS_PLATFORM == CS_P_CC3220
-#include <ti/drivers/net/wifi/porting/user.h>
-#include <ti/drivers/net/wifi/simplelink.h>
-#include <ti/drivers/net/wifi/sl_socket.h>
-#include <ti/drivers/net/wifi/netapp.h>
-#else
-/* We want to disable SL_INC_STD_BSD_API_NAMING, so we include user.h ourselves
- * and undef it. */
-#define PROVISIONING_API_H_
-#include <simplelink/user.h>
-#undef PROVISIONING_API_H_
-#undef SL_INC_STD_BSD_API_NAMING
-
-#include <simplelink/include/simplelink.h>
-#include <simplelink/include/netapp.h>
-#endif /* CS_PLATFORM == CS_P_CC3220 */
-
-/* Now define only the subset of the BSD API that we use.
- * Notably, close(), read() and write() are not defined. */
-#define AF_INET SL_AF_INET
-
-#define socklen_t SlSocklen_t
-#define sockaddr SlSockAddr_t
-#define sockaddr_in SlSockAddrIn_t
-#define in_addr SlInAddr_t
-
-#define SOCK_STREAM SL_SOCK_STREAM
-#define SOCK_DGRAM SL_SOCK_DGRAM
-
-#define htonl sl_Htonl
-#define ntohl sl_Ntohl
-#define htons sl_Htons
-#define ntohs sl_Ntohs
-
-#ifndef EACCES
-#define EACCES SL_EACCES
-#endif
-#ifndef EAFNOSUPPORT
-#define EAFNOSUPPORT SL_EAFNOSUPPORT
-#endif
-#ifndef EAGAIN
-#define EAGAIN SL_EAGAIN
-#endif
-#ifndef EBADF
-#define EBADF SL_EBADF
-#endif
-#ifndef EINVAL
-#define EINVAL SL_EINVAL
-#endif
-#ifndef ENOMEM
-#define ENOMEM SL_ENOMEM
-#endif
-#ifndef EWOULDBLOCK
-#define EWOULDBLOCK SL_EWOULDBLOCK
-#endif
-
-#define SOMAXCONN 8
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-const char *inet_ntop(int af, const void *src, char *dst, socklen_t size);
-char *inet_ntoa(struct in_addr in);
-int inet_pton(int af, const char *src, void *dst);
-
-struct mg_mgr;
-struct mg_connection;
-
-typedef void (*mg_init_cb)(struct mg_mgr *mgr);
-bool mg_start_task(int priority, int stack_size, mg_init_cb mg_init);
-
-void mg_run_in_task(void (*cb)(struct mg_mgr *mgr, void *arg), void *cb_arg);
-
-int sl_fs_init(void);
-
-void sl_restart_cb(struct mg_mgr *mgr);
-
-int sl_set_ssl_opts(int sock, struct mg_connection *nc);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* !defined(__SIMPLELINK_H__) */
-
-/* Compatibility with older versions of SimpleLink */
-#if SL_MAJOR_VERSION_NUM < 2
-
-#define SL_ERROR_BSD_EAGAIN SL_EAGAIN
-#define SL_ERROR_BSD_EALREADY SL_EALREADY
-#define SL_ERROR_BSD_ENOPROTOOPT SL_ENOPROTOOPT
-#define SL_ERROR_BSD_ESECDATEERROR SL_ESECDATEERROR
-#define SL_ERROR_BSD_ESECSNOVERIFY SL_ESECSNOVERIFY
-#define SL_ERROR_FS_FAILED_TO_ALLOCATE_MEM SL_FS_ERR_FAILED_TO_ALLOCATE_MEM
-#define SL_ERROR_FS_FILE_HAS_NOT_BEEN_CLOSE_CORRECTLY \
-  SL_FS_FILE_HAS_NOT_BEEN_CLOSE_CORRECTLY
-#define SL_ERROR_FS_FILE_NAME_EXIST SL_FS_FILE_NAME_EXIST
-#define SL_ERROR_FS_FILE_NOT_EXISTS SL_FS_ERR_FILE_NOT_EXISTS
-#define SL_ERROR_FS_NO_AVAILABLE_NV_INDEX SL_FS_ERR_NO_AVAILABLE_NV_INDEX
-#define SL_ERROR_FS_NOT_ENOUGH_STORAGE_SPACE SL_FS_ERR_NO_AVAILABLE_BLOCKS
-#define SL_ERROR_FS_NOT_SUPPORTED SL_FS_ERR_NOT_SUPPORTED
-#define SL_ERROR_FS_WRONG_FILE_NAME SL_FS_WRONG_FILE_NAME
-#define SL_ERROR_FS_INVALID_HANDLE SL_FS_ERR_INVALID_HANDLE
-#define SL_NETCFG_MAC_ADDRESS_GET SL_MAC_ADDRESS_GET
-#define SL_SOCKET_FD_ZERO SL_FD_ZERO
-#define SL_SOCKET_FD_SET SL_FD_SET
-#define SL_SOCKET_FD_ISSET SL_FD_ISSET
-#define SL_SO_SECURE_DOMAIN_NAME_VERIFICATION SO_SECURE_DOMAIN_NAME_VERIFICATION
-
-#define SL_FS_READ FS_MODE_OPEN_READ
-#define SL_FS_WRITE FS_MODE_OPEN_WRITE
-
-#define SL_FI_FILE_SIZE(fi) ((fi).FileLen)
-#define SL_FI_FILE_MAX_SIZE(fi) ((fi).AllocatedLen)
-
-#define SlDeviceVersion_t SlVersionFull
-#define sl_DeviceGet sl_DevGet
-#define SL_DEVICE_GENERAL SL_DEVICE_GENERAL_CONFIGURATION
-#define SL_LEN_TYPE _u8
-#define SL_OPT_TYPE _u8
-
-#else /* SL_MAJOR_VERSION_NUM >= 2 */
-
-#define FS_MODE_OPEN_CREATE(max_size, flag) \
-  (SL_FS_CREATE | SL_FS_CREATE_MAX_SIZE(max_size))
-#define SL_FI_FILE_SIZE(fi) ((fi).Len)
-#define SL_FI_FILE_MAX_SIZE(fi) ((fi).MaxSize)
-
-#define SL_LEN_TYPE _u16
-#define SL_OPT_TYPE _u16
-
-#endif /* SL_MAJOR_VERSION_NUM < 2 */
-
-int slfs_open(const unsigned char *fname, uint32_t flags, uint32_t *token);
-
-#endif /* MG_NET_IF == MG_NET_IF_SIMPLELINK */
-
-#endif /* CS_COMMON_PLATFORMS_SIMPLELINK_CS_SIMPLELINK_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_wince.h"
-#endif
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_WINCE_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_WINCE_H_
-
-#if CS_PLATFORM == CS_P_WINCE
-
-/*
- * MSVC++ 14.0 _MSC_VER == 1900 (Visual Studio 2015)
- * MSVC++ 12.0 _MSC_VER == 1800 (Visual Studio 2013)
- * MSVC++ 11.0 _MSC_VER == 1700 (Visual Studio 2012)
- * MSVC++ 10.0 _MSC_VER == 1600 (Visual Studio 2010)
- * MSVC++ 9.0  _MSC_VER == 1500 (Visual Studio 2008)
- * MSVC++ 8.0  _MSC_VER == 1400 (Visual Studio 2005)
- * MSVC++ 7.1  _MSC_VER == 1310 (Visual Studio 2003)
- * MSVC++ 7.0  _MSC_VER == 1300
- * MSVC++ 6.0  _MSC_VER == 1200
- * MSVC++ 5.0  _MSC_VER == 1100
- */
-#pragma warning(disable : 4127) /* FD_SET() emits warning, disable it */
-#pragma warning(disable : 4204) /* missing c99 support */
-
-#ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
-#define _WINSOCK_DEPRECATED_NO_WARNINGS 1
-#endif
-
-#ifndef _CRT_SECURE_NO_WARNINGS
-#define _CRT_SECURE_NO_WARNINGS
-#endif
-
-#include <assert.h>
-#include <limits.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <time.h>
-
-#pragma comment(lib, "ws2.lib") /* Linking with WinCE winsock library */
-
-#include <winsock2.h>
-#include <ws2tcpip.h>
-#include <windows.h>
-
-#define strdup _strdup
-
-#ifndef EINPROGRESS
-#define EINPROGRESS WSAEINPROGRESS
-#endif
-
-#ifndef EWOULDBLOCK
-#define EWOULDBLOCK WSAEWOULDBLOCK
-#endif
-
-#ifndef EAGAIN
-#define EAGAIN EWOULDBLOCK
-#endif
-
-#ifndef __func__
-#define STRX(x) #x
-#define STR(x) STRX(x)
-#define __func__ __FILE__ ":" STR(__LINE__)
-#endif
-
-#define snprintf _snprintf
-#define fileno _fileno
-#define vsnprintf _vsnprintf
-#define sleep(x) Sleep((x) *1000)
-#define to64(x) _atoi64(x)
-#define rmdir _rmdir
-
-#if defined(_MSC_VER) && _MSC_VER >= 1400
-#define fseeko(x, y, z) _fseeki64((x), (y), (z))
-#else
-#define fseeko(x, y, z) fseek((x), (y), (z))
-#endif
-
-typedef int socklen_t;
-
-#if _MSC_VER >= 1700
-#include <stdint.h>
-#else
-typedef signed char int8_t;
-typedef unsigned char uint8_t;
-typedef int int32_t;
-typedef unsigned int uint32_t;
-typedef short int16_t;
-typedef unsigned short uint16_t;
-typedef __int64 int64_t;
-typedef unsigned __int64 uint64_t;
-#endif
-
-typedef SOCKET sock_t;
-typedef uint32_t in_addr_t;
-
-#ifndef UINT16_MAX
-#define UINT16_MAX 65535
-#endif
-
-#ifndef UINT32_MAX
-#define UINT32_MAX 4294967295
-#endif
-
-#ifndef pid_t
-#define pid_t HANDLE
-#endif
-
-#define INT64_FMT "I64d"
-#define INT64_X_FMT "I64x"
-/* TODO(alashkin): check if this is correct */
-#define SIZE_T_FMT "u"
-
-#define DIRSEP '\\'
-#define CS_DEFINE_DIRENT
-
-#ifndef va_copy
-#ifdef __va_copy
-#define va_copy __va_copy
-#else
-#define va_copy(x, y) (x) = (y)
-#endif
-#endif
-
-#ifndef MG_MAX_HTTP_REQUEST_SIZE
-#define MG_MAX_HTTP_REQUEST_SIZE 8192
-#endif
-
-#ifndef MG_MAX_HTTP_SEND_MBUF
-#define MG_MAX_HTTP_SEND_MBUF 4096
-#endif
-
-#ifndef MG_MAX_HTTP_HEADERS
-#define MG_MAX_HTTP_HEADERS 40
-#endif
-
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
-#endif
-
-#define abort() DebugBreak();
-
-#ifndef BUFSIZ
-#define BUFSIZ 4096
-#endif
-/*
- * Explicitly disabling MG_ENABLE_THREADS for WinCE
- * because they are enabled for _WIN32 by default
- */
-#ifndef MG_ENABLE_THREADS
-#define MG_ENABLE_THREADS 0
-#endif
-
-#ifndef MG_ENABLE_FILESYSTEM
-#define MG_ENABLE_FILESYSTEM 1
-#endif
-
-#ifndef MG_NET_IF
-#define MG_NET_IF MG_NET_IF_SOCKET
-#endif
-
-typedef struct _stati64 {
-  uint32_t st_mtime;
-  uint32_t st_size;
-  uint32_t st_mode;
-} cs_stat_t;
-
-/*
- * WinCE 6.0 has a lot of useful definitions in ATL (not windows.h) headers
- * use #ifdefs to avoid conflicts
- */
-
-#ifndef ENOENT
-#define ENOENT ERROR_PATH_NOT_FOUND
-#endif
-
-#ifndef EACCES
-#define EACCES ERROR_ACCESS_DENIED
-#endif
-
-#ifndef ENOMEM
-#define ENOMEM ERROR_NOT_ENOUGH_MEMORY
-#endif
-
-#ifndef _UINTPTR_T_DEFINED
-typedef unsigned int *uintptr_t;
-#endif
-
-#define _S_IFREG 2
-#define _S_IFDIR 4
-
-#ifndef S_ISDIR
-#define S_ISDIR(x) (((x) &_S_IFDIR) != 0)
-#endif
-
-#ifndef S_ISREG
-#define S_ISREG(x) (((x) &_S_IFREG) != 0)
-#endif
-
-int open(const char *filename, int oflag, int pmode);
-int _wstati64(const wchar_t *path, cs_stat_t *st);
-const char *strerror();
-
-#endif /* CS_PLATFORM == CS_P_WINCE */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_WINCE_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_nxp_lpc.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_NXP_LPC_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_NXP_LPC_H_
-
-#if CS_PLATFORM == CS_P_NXP_LPC
-
-#include <ctype.h>
-#include <stdint.h>
-#include <string.h>
-
-#define SIZE_T_FMT "u"
-typedef struct stat cs_stat_t;
-#define INT64_FMT "lld"
-#define INT64_X_FMT "llx"
-#define __cdecl
-
-#define MG_LWIP 1
-
-#define MG_NET_IF MG_NET_IF_LWIP_LOW_LEVEL
-
-/*
- * LPCXpress comes with 3 C library implementations: Newlib, NewlibNano and
- *Redlib.
- * See https://community.nxp.com/message/630860 for more details.
- *
- * Redlib is the default and lacks certain things, so we provide them.
- */
-#ifdef __REDLIB_INTERFACE_VERSION__
-
-/* Let LWIP define timeval for us. */
-#define LWIP_TIMEVAL_PRIVATE 1
-
-#define va_copy(d, s) __builtin_va_copy(d, s)
-
-#define CS_ENABLE_TO64 1
-#define to64(x) cs_to64(x)
-
-#define CS_ENABLE_STRDUP 1
-
-#else
-
-#include <sys/time.h>
-#define LWIP_TIMEVAL_PRIVATE 0
-#define to64(x) strtoll(x, NULL, 10)
-
-#endif
-
-#endif /* CS_PLATFORM == CS_P_NXP_LPC */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_NXP_LPC_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_nxp_kinetis.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_NXP_KINETIS_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_NXP_KINETIS_H_
-
-#if CS_PLATFORM == CS_P_NXP_KINETIS
-
-#include <ctype.h>
-#include <inttypes.h>
-#include <string.h>
-#include <sys/time.h>
-
-#define SIZE_T_FMT "u"
-typedef struct stat cs_stat_t;
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT "lld"
-#define INT64_X_FMT "llx"
-#define __cdecl
-
-#define MG_LWIP 1
-
-#define MG_NET_IF MG_NET_IF_LWIP_LOW_LEVEL
-
-/* struct timeval is defined in sys/time.h. */
-#define LWIP_TIMEVAL_PRIVATE 0
-
-#endif /* CS_PLATFORM == CS_P_NXP_KINETIS */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_NXP_KINETIS_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_pic32.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_PIC32_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_PIC32_H_
-
-#if CS_PLATFORM == CS_P_PIC32
-
-#define MG_NET_IF MG_NET_IF_PIC32
-
-#include <stdint.h>
-#include <time.h>
-#include <ctype.h>
-#include <stdlib.h>
-
-#include <system_config.h>
-#include <system_definitions.h>
-
-#include <sys/types.h>
-
-typedef TCP_SOCKET sock_t;
-#define to64(x) strtoll(x, NULL, 10)
-
-#define SIZE_T_FMT "lu"
-#define INT64_FMT "lld"
-
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
-#endif
-
-char *inet_ntoa(struct in_addr in);
-
-#endif /* CS_PLATFORM == CS_P_PIC32 */
-
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_PIC32_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_rs14100.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_RS14100_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_RS14100_H_
-#if CS_PLATFORM == CS_P_RS14100
-
-#include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#ifdef MGOS_HAVE_VFS_COMMON
-#include <mgos_vfs.h>
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT "lld"
-#define SIZE_T_FMT "u"
-typedef struct stat cs_stat_t;
-#define DIRSEP '/'
-
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
-#endif
-
-#ifndef MG_ENABLE_FILESYSTEM
-#define MG_ENABLE_FILESYSTEM 1
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* CS_PLATFORM == CS_P_RS14100 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_RS14100_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/platform_stm32.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_PLATFORM_STM32_H_
-#define CS_COMMON_PLATFORMS_PLATFORM_STM32_H_
-#if CS_PLATFORM == CS_P_STM32
-
-#include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <dirent.h>
-
-#include <stm32_sdk_hal.h>
-
-#define to64(x) strtoll(x, NULL, 10)
-#define INT64_FMT "lld"
-#define SIZE_T_FMT "u"
-typedef struct stat cs_stat_t;
-#define DIRSEP '/'
-
-#ifndef CS_ENABLE_STDIO
-#define CS_ENABLE_STDIO 1
-#endif
-
-#ifndef MG_ENABLE_FILESYSTEM
-#define MG_ENABLE_FILESYSTEM 1
-#endif
-
-#endif /* CS_PLATFORM == CS_P_STM32 */
-#endif /* CS_COMMON_PLATFORMS_PLATFORM_STM32_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/platforms/lwip/mg_lwip.h"
-#endif
-
-#ifndef CS_COMMON_PLATFORMS_LWIP_MG_LWIP_H_
-#define CS_COMMON_PLATFORMS_LWIP_MG_LWIP_H_
-
-#ifndef MG_LWIP
-#define MG_LWIP 0
-#endif
-
-#if MG_LWIP
-
-/*
- * When compiling for nRF5x chips with arm-none-eabi-gcc, it has BYTE_ORDER
- * already defined, so in order to avoid warnings in lwip, we have to undefine
- * it.
- *
- * TODO: Check if in the future versions of nRF5 SDK that changes.
- *       Current version of nRF51 SDK: 0.8.0
- *                          nRF5 SDK:  0.9.0
- */
-#if CS_PLATFORM == CS_P_NRF51 || CS_PLATFORM == CS_P_NRF52
-#undef BYTE_ORDER
-#endif
-
-#include <lwip/opt.h>
-#include <lwip/err.h>
-#include <lwip/ip_addr.h>
-#include <lwip/inet.h>
-#include <lwip/netdb.h>
-#include <lwip/dns.h>
-
-#ifndef LWIP_PROVIDE_ERRNO
-#include <errno.h>
-#endif
-
-#if LWIP_SOCKET
-#include <lwip/sockets.h>
-#else
-/* We really need the definitions from sockets.h. */
-#undef LWIP_SOCKET
-#define LWIP_SOCKET 1
-#include <lwip/sockets.h>
-#undef LWIP_SOCKET
-#define LWIP_SOCKET 0
-#endif
-
-#define INVALID_SOCKET (-1)
-#define SOMAXCONN 10
-typedef int sock_t;
-
-#if MG_NET_IF == MG_NET_IF_LWIP_LOW_LEVEL
-struct mg_mgr;
-struct mg_connection;
-void mg_lwip_set_keepalive_params(struct mg_connection *nc, int idle,
-                                  int interval, int count);
-#endif
-
-/* For older version of LWIP */
-#ifndef ipX_2_ip
-#define ipX_2_ip(x) (x)
-#endif
-
-#endif /* MG_LWIP */
-
-#endif /* CS_COMMON_PLATFORMS_LWIP_MG_LWIP_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_md5.h"
-#endif
-
-#ifndef CS_COMMON_MD5_H_
-#define CS_COMMON_MD5_H_
-
-/* Amalgamated: #include "common/platform.h" */
-
-#ifndef CS_DISABLE_MD5
-#define CS_DISABLE_MD5 0
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-typedef struct {
-  uint32_t buf[4];
-  uint32_t bits[2];
-  unsigned char in[64];
-} cs_md5_ctx;
-
-void cs_md5_init(cs_md5_ctx *c);
-void cs_md5_update(cs_md5_ctx *c, const unsigned char *data, size_t len);
-void cs_md5_final(unsigned char *md, cs_md5_ctx *c);
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* CS_COMMON_MD5_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_sha1.h"
-#endif
-
-#ifndef CS_COMMON_SHA1_H_
-#define CS_COMMON_SHA1_H_
-
-#ifndef CS_DISABLE_SHA1
-#define CS_DISABLE_SHA1 0
-#endif
-
-#if !CS_DISABLE_SHA1
-
-/* Amalgamated: #include "common/platform.h" */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-typedef struct {
-  uint32_t state[5];
-  uint32_t count[2];
-  unsigned char buffer[64];
-} cs_sha1_ctx;
-
-void cs_sha1_init(cs_sha1_ctx *);
-void cs_sha1_update(cs_sha1_ctx *, const unsigned char *data, uint32_t len);
-void cs_sha1_final(unsigned char digest[20], cs_sha1_ctx *);
-void cs_hmac_sha1(const unsigned char *key, size_t key_len,
-                  const unsigned char *text, size_t text_len,
-                  unsigned char out[20]);
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* CS_DISABLE_SHA1 */
-
-#endif /* CS_COMMON_SHA1_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_time.h"
-#endif
-
-#ifndef CS_COMMON_CS_TIME_H_
-#define CS_COMMON_CS_TIME_H_
-
-#include <time.h>
-
-/* Amalgamated: #include "common/platform.h" */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/* Sub-second granularity time(). */
-double cs_time(void);
-
-/*
- * Similar to (non-standard) timegm, converts broken-down time into the number
- * of seconds since Unix Epoch.
- */
-double cs_timegm(const struct tm *tm);
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* CS_COMMON_CS_TIME_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/mg_str.h"
-#endif
-
-#ifndef CS_COMMON_MG_STR_H_
-#define CS_COMMON_MG_STR_H_
-
-#include <stddef.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* Describes chunk of memory */
-struct mg_str {
-  const char *p; /* Memory chunk pointer */
-  size_t len;    /* Memory chunk length */
-};
-
-/*
- * Helper function for creating mg_str struct from plain C string.
- * `NULL` is allowed and becomes `{NULL, 0}`.
- */
-struct mg_str mg_mk_str(const char *s);
-
-/*
- * Like `mg_mk_str`, but takes string length explicitly.
- */
-struct mg_str mg_mk_str_n(const char *s, size_t len);
-
-/* Macro for initializing mg_str. */
-#define MG_MK_STR(str_literal) \
-  { str_literal, sizeof(str_literal) - 1 }
-#define MG_MK_STR_N(str_literal, len) \
-  { str_literal, len }
-#define MG_NULL_STR \
-  { NULL, 0 }
-
-/*
- * Cross-platform version of `strcmp()` where where first string is
- * specified by `struct mg_str`.
- */
-int mg_vcmp(const struct mg_str *str2, const char *str1);
-
-/*
- * Cross-platform version of `strncasecmp()` where first string is
- * specified by `struct mg_str`.
- */
-int mg_vcasecmp(const struct mg_str *str2, const char *str1);
-
-/* Creates a copy of s (heap-allocated). */
-struct mg_str mg_strdup(const struct mg_str s);
-
-/*
- * Creates a copy of s (heap-allocated).
- * Resulting string is NUL-terminated (but NUL is not included in len).
- */
-struct mg_str mg_strdup_nul(const struct mg_str s);
-
-/*
- * Locates character in a string.
- */
-const char *mg_strchr(const struct mg_str s, int c);
-
-/*
- * Compare two `mg_str`s; return value is the same as `strcmp`.
- */
-int mg_strcmp(const struct mg_str str1, const struct mg_str str2);
-
-/*
- * Like `mg_strcmp`, but compares at most `n` characters.
- */
-int mg_strncmp(const struct mg_str str1, const struct mg_str str2, size_t n);
-
-/*
- * Compare two `mg_str`s ignoreing case; return value is the same as `strcmp`.
- */
-int mg_strcasecmp(const struct mg_str str1, const struct mg_str str2);
-
-/*
- * Free the string (assuming it was heap allocated).
- */
-void mg_strfree(struct mg_str *s);
-
-/*
- * Finds the first occurrence of a substring `needle` in the `haystack`.
- */
-const char *mg_strstr(const struct mg_str haystack, const struct mg_str needle);
-
-/* Strip whitespace at the start and the end of s */
-struct mg_str mg_strstrip(struct mg_str s);
-
-/* Returns 1 if s starts with the given prefix. */
-int mg_str_starts_with(struct mg_str s, struct mg_str prefix);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* CS_COMMON_MG_STR_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/mbuf.h"
-#endif
-
-/*
- * Mbufs are mutable/growing memory buffers, like C++ strings.
- * Mbuf can append data to the end of a buffer or insert data into arbitrary
- * position in the middle of a buffer. The buffer grows automatically when
- * needed.
- */
-
-#ifndef CS_COMMON_MBUF_H_
-#define CS_COMMON_MBUF_H_
-
-#include <stdlib.h>
-/* Amalgamated: #include "common/platform.h" */
-
-#if defined(__cplusplus)
-extern "C" {
-#endif
-
-#ifndef MBUF_SIZE_MULTIPLIER
-#define MBUF_SIZE_MULTIPLIER 1.5
-#endif
-
-#ifndef MBUF_SIZE_MAX_HEADROOM
-#ifdef BUFSIZ
-#define MBUF_SIZE_MAX_HEADROOM BUFSIZ
-#else
-#define MBUF_SIZE_MAX_HEADROOM 1024
-#endif
-#endif
-
-/* Memory buffer descriptor */
-struct mbuf {
-  char *buf;   /* Buffer pointer */
-  size_t len;  /* Data length. Data is located between offset 0 and len. */
-  size_t size; /* Buffer size allocated by realloc(1). Must be >= len */
-};
-
-/*
- * Initialises an Mbuf.
- * `initial_capacity` specifies the initial capacity of the mbuf.
- */
-void mbuf_init(struct mbuf *, size_t initial_capacity);
-
-/* Frees the space allocated for the mbuffer and resets the mbuf structure. */
-void mbuf_free(struct mbuf *);
-
-/*
- * Appends data to the Mbuf.
- *
- * Returns the number of bytes appended or 0 if out of memory.
- */
-size_t mbuf_append(struct mbuf *, const void *data, size_t data_size);
-
-/*
- * Appends data to the Mbuf and frees it (data must be heap-allocated).
- *
- * Returns the number of bytes appended or 0 if out of memory.
- * data is freed irrespective of return value.
- */
-size_t mbuf_append_and_free(struct mbuf *, void *data, size_t data_size);
-
-/*
- * Inserts data at a specified offset in the Mbuf.
- *
- * Existing data will be shifted forwards and the buffer will
- * be grown if necessary.
- * Returns the number of bytes inserted.
- */
-size_t mbuf_insert(struct mbuf *, size_t, const void *, size_t);
-
-/* Removes `data_size` bytes from the beginning of the buffer. */
-void mbuf_remove(struct mbuf *, size_t data_size);
-
-/*
- * Resizes an Mbuf.
- *
- * If `new_size` is smaller than buffer's `len`, the
- * resize is not performed.
- */
-void mbuf_resize(struct mbuf *, size_t new_size);
-
-/* Moves the state from one mbuf to the other. */
-void mbuf_move(struct mbuf *from, struct mbuf *to);
-
-/* Removes all the data from mbuf (if any). */
-void mbuf_clear(struct mbuf *);
-
-/* Shrinks an Mbuf by resizing its `size` to `len`. */
-void mbuf_trim(struct mbuf *);
-
-#if defined(__cplusplus)
-}
-#endif /* __cplusplus */
-
-#endif /* CS_COMMON_MBUF_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/cs_base64.h"
-#endif
-
-#ifndef CS_COMMON_CS_BASE64_H_
-#define CS_COMMON_CS_BASE64_H_
-
-#ifndef DISABLE_BASE64
-#define DISABLE_BASE64 0
-#endif
-
-#if !DISABLE_BASE64
-
-#include <stdio.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef void (*cs_base64_putc_t)(char, void *);
-
-struct cs_base64_ctx {
-  /* cannot call it putc because it's a macro on some environments */
-  cs_base64_putc_t b64_putc;
-  unsigned char chunk[3];
-  int chunk_size;
-  void *user_data;
-};
-
-void cs_base64_init(struct cs_base64_ctx *ctx, cs_base64_putc_t putc,
-                    void *user_data);
-void cs_base64_update(struct cs_base64_ctx *ctx, const char *str, size_t len);
-void cs_base64_finish(struct cs_base64_ctx *ctx);
-
-void cs_base64_encode(const unsigned char *src, int src_len, char *dst);
-void cs_fprint_base64(FILE *f, const unsigned char *src, int src_len);
-
-/*
- * Decodes a base64 string `s` length `len` into `dst`.
- * `dst` must have enough space to hold the result.
- * `*dec_len` will contain the resulting length of the string in `dst`
- * while return value will return number of processed bytes in `src`.
- * Return value == len indicates successful processing of all the data.
- */
-int cs_base64_decode(const unsigned char *s, int len, char *dst, int *dec_len);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* DISABLE_BASE64 */
-
-#endif /* CS_COMMON_CS_BASE64_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/str_util.h"
-#endif
-
-#ifndef CS_COMMON_STR_UTIL_H_
-#define CS_COMMON_STR_UTIL_H_
-
-#include <stdarg.h>
-#include <stdlib.h>
-
-/* Amalgamated: #include "common/mg_str.h" */
-/* Amalgamated: #include "common/platform.h" */
-
-#ifndef CS_ENABLE_STRDUP
-#define CS_ENABLE_STRDUP 0
-#endif
-
-#ifndef CS_ENABLE_TO64
-#define CS_ENABLE_TO64 0
-#endif
-
-/*
- * Expands to a string representation of its argument: e.g.
- * `CS_STRINGIFY_LIT(5) expands to "5"`
- */
-#if !defined(_MSC_VER) || _MSC_VER >= 1900
-#define CS_STRINGIFY_LIT(...) #__VA_ARGS__
-#else
-#define CS_STRINGIFY_LIT(x) #x
-#endif
-
-/*
- * Expands to a string representation of its argument, which is allowed
- * to be a macro: e.g.
- *
- * #define FOO 123
- * CS_STRINGIFY_MACRO(FOO)
- *
- * expands to 123.
- */
-#define CS_STRINGIFY_MACRO(x) CS_STRINGIFY_LIT(x)
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/*
- * Equivalent of standard `strnlen()`.
- */
-size_t c_strnlen(const char *s, size_t maxlen);
-
-/*
- * Equivalent of standard `snprintf()`.
- */
-int c_snprintf(char *buf, size_t buf_size, const char *format, ...)
-    PRINTF_LIKE(3, 4);
-
-/*
- * Equivalent of standard `vsnprintf()`.
- */
-int c_vsnprintf(char *buf, size_t buf_size, const char *format, va_list ap);
-
-/*
- * Find the first occurrence of find in s, where the search is limited to the
- * first slen characters of s.
- */
-const char *c_strnstr(const char *s, const char *find, size_t slen);
-
-/*
- * Stringify binary data. Output buffer size must be 2 * size_of_input + 1
- * because each byte of input takes 2 bytes in string representation
- * plus 1 byte for the terminating \0 character.
- */
-void cs_to_hex(char *to, const unsigned char *p, size_t len);
-
-/*
- * Convert stringified binary data back to binary.
- * Does the reverse of `cs_to_hex()`.
- */
-void cs_from_hex(char *to, const char *p, size_t len);
-
-#if CS_ENABLE_STRDUP
-/*
- * Equivalent of standard `strdup()`, defined if only `CS_ENABLE_STRDUP` is 1.
- */
-char *strdup(const char *src);
-#endif
-
-#if CS_ENABLE_TO64
-#include <stdint.h>
-/*
- * Simple string -> int64 conversion routine.
- */
-int64_t cs_to64(const char *s);
-#endif
-
-/*
- * Cross-platform version of `strncasecmp()`.
- */
-int mg_ncasecmp(const char *s1, const char *s2, size_t len);
-
-/*
- * Cross-platform version of `strcasecmp()`.
- */
-int mg_casecmp(const char *s1, const char *s2);
-
-/*
- * Prints message to the buffer. If the buffer is large enough to hold the
- * message, it returns buffer. If buffer is to small, it allocates a large
- * enough buffer on heap and returns allocated buffer.
- * This is a supposed use case:
- *
- * ```c
- *    char buf[5], *p = buf;
- *    mg_avprintf(&p, sizeof(buf), "%s", "hi there");
- *    use_p_somehow(p);
- *    if (p != buf) {
- *      free(p);
- *    }
- * ```
- *
- * The purpose of this is to avoid malloc-ing if generated strings are small.
- */
-int mg_asprintf(char **buf, size_t size, const char *fmt, ...)
-    PRINTF_LIKE(3, 4);
-
-/* Same as mg_asprintf, but takes varargs list. */
-int mg_avprintf(char **buf, size_t size, const char *fmt, va_list ap);
-
-/*
- * A helper function for traversing a comma separated list of values.
- * It returns a list pointer shifted to the next value or NULL if the end
- * of the list found.
- * The value is stored in a val vector. If the value has a form "x=y", then
- * eq_val vector is initialised to point to the "y" part, and val vector length
- * is adjusted to point only to "x".
- * If the list is just a comma separated list of entries, like "aa,bb,cc" then
- * `eq_val` will contain zero-length string.
- *
- * The purpose of this function is to parse comma separated string without
- * any copying/memory allocation.
- */
-const char *mg_next_comma_list_entry(const char *list, struct mg_str *val,
-                                     struct mg_str *eq_val);
-
-/*
- * Like `mg_next_comma_list_entry()`, but takes `list` as `struct mg_str`.
- * NB: Test return value's .p, not .len. On last itreation that yields result
- * .len will be 0 but .p will not. When finished, .p will be NULL.
- */
-struct mg_str mg_next_comma_list_entry_n(struct mg_str list, struct mg_str *val,
-                                         struct mg_str *eq_val);
-
-/*
- * Matches 0-terminated string (mg_match_prefix) or string with given length
- * mg_match_prefix_n against a glob pattern. Glob syntax:
- * ```
- * - * matches zero or more characters until a slash character /
- * - ** matches zero or more characters
- * - ? Matches exactly one character which is not a slash /
- * - | or ,  divides alternative patterns
- * - any other character matches itself
- * ```
- * Match is case-insensitive. Return number of bytes matched.
- * Examples:
- * ```
- * mg_match_prefix("a*f", len, "abcdefgh") == 6
- * mg_match_prefix("a*f", len, "abcdexgh") == 0
- * mg_match_prefix("a*f|de*,xy", len, "defgh") == 5
- * mg_match_prefix("?*", len, "abc") == 3
- * mg_match_prefix("?*", len, "") == 0
- * ```
- */
-size_t mg_match_prefix(const char *pattern, int pattern_len, const char *str);
-
-/*
- * Like `mg_match_prefix()`, but takes `pattern` and `str` as `struct mg_str`.
- */
-size_t mg_match_prefix_n(const struct mg_str pattern, const struct mg_str str);
-
-#ifdef __cplusplus
-}
+typedef int socklen_t;
+#define MG_DIRSEP '\\'
+#ifndef PATH_MAX
+#define PATH_MAX MAX_PATH
 #endif
-
-#endif /* CS_COMMON_STR_UTIL_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "common/queue.h"
+#ifndef EINPROGRESS
+#define EINPROGRESS WSAEINPROGRESS
 #endif
-/* clang-format off */
-/*-
- * Copyright (c) 1991, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)queue.h	8.5 (Berkeley) 8/20/94
- * $FreeBSD$
- */
-
-#ifndef _SYS_QUEUE_H_
-#define	_SYS_QUEUE_H_
-
-/*
- * This file defines four types of data structures: singly-linked lists,
- * singly-linked tail queues, lists and tail queues.
- *
- * A singly-linked list is headed by a single forward pointer. The elements
- * are singly linked for minimum space and pointer manipulation overhead at
- * the expense of O(n) removal for arbitrary elements. New elements can be
- * added to the list after an existing element or at the head of the list.
- * Elements being removed from the head of the list should use the explicit
- * macro for this purpose for optimum efficiency. A singly-linked list may
- * only be traversed in the forward direction.  Singly-linked lists are ideal
- * for applications with large datasets and few or no removals or for
- * implementing a LIFO queue.
- *
- * A singly-linked tail queue is headed by a pair of pointers, one to the
- * head of the list and the other to the tail of the list. The elements are
- * singly linked for minimum space and pointer manipulation overhead at the
- * expense of O(n) removal for arbitrary elements. New elements can be added
- * to the list after an existing element, at the head of the list, or at the
- * end of the list. Elements being removed from the head of the tail queue
- * should use the explicit macro for this purpose for optimum efficiency.
- * A singly-linked tail queue may only be traversed in the forward direction.
- * Singly-linked tail queues are ideal for applications with large datasets
- * and few or no removals or for implementing a FIFO queue.
- *
- * A list is headed by a single forward pointer (or an array of forward
- * pointers for a hash table header). The elements are doubly linked
- * so that an arbitrary element can be removed without a need to
- * traverse the list. New elements can be added to the list before
- * or after an existing element or at the head of the list. A list
- * may be traversed in either direction.
- *
- * A tail queue is headed by a pair of pointers, one to the head of the
- * list and the other to the tail of the list. The elements are doubly
- * linked so that an arbitrary element can be removed without a need to
- * traverse the list. New elements can be added to the list before or
- * after an existing element, at the head of the list, or at the end of
- * the list. A tail queue may be traversed in either direction.
- *
- * For details on the use of these macros, see the queue(3) manual page.
- *
- *
- *				SLIST	LIST	STAILQ	TAILQ
- * _HEAD			+	+	+	+
- * _CLASS_HEAD			+	+	+	+
- * _HEAD_INITIALIZER		+	+	+	+
- * _ENTRY			+	+	+	+
- * _CLASS_ENTRY			+	+	+	+
- * _INIT			+	+	+	+
- * _EMPTY			+	+	+	+
- * _FIRST			+	+	+	+
- * _NEXT			+	+	+	+
- * _PREV			-	+	-	+
- * _LAST			-	-	+	+
- * _FOREACH			+	+	+	+
- * _FOREACH_FROM		+	+	+	+
- * _FOREACH_SAFE		+	+	+	+
- * _FOREACH_FROM_SAFE		+	+	+	+
- * _FOREACH_REVERSE		-	-	-	+
- * _FOREACH_REVERSE_FROM	-	-	-	+
- * _FOREACH_REVERSE_SAFE	-	-	-	+
- * _FOREACH_REVERSE_FROM_SAFE	-	-	-	+
- * _INSERT_HEAD			+	+	+	+
- * _INSERT_BEFORE		-	+	-	+
- * _INSERT_AFTER		+	+	+	+
- * _INSERT_TAIL			-	-	+	+
- * _CONCAT			-	-	+	+
- * _REMOVE_AFTER		+	-	+	-
- * _REMOVE_HEAD			+	-	+	-
- * _REMOVE			+	+	+	+
- * _SWAP			+	+	+	+
- *
- */
-#ifdef QUEUE_MACRO_DEBUG
-/* Store the last 2 places the queue element or head was altered */
-struct qm_trace {
-	unsigned long	 lastline;
-	unsigned long	 prevline;
-	const char	*lastfile;
-	const char	*prevfile;
-};
-
-#define	TRACEBUF	struct qm_trace trace;
-#define	TRACEBUF_INITIALIZER	{ __LINE__, 0, __FILE__, NULL } ,
-#define	TRASHIT(x)	do {(x) = (void *)-1;} while (0)
-#define	QMD_SAVELINK(name, link)	void **name = (void *)&(link)
-
-#define	QMD_TRACE_HEAD(head) do {					\
-	(head)->trace.prevline = (head)->trace.lastline;		\
-	(head)->trace.prevfile = (head)->trace.lastfile;		\
-	(head)->trace.lastline = __LINE__;				\
-	(head)->trace.lastfile = __FILE__;				\
-} while (0)
-
-#define	QMD_TRACE_ELEM(elem) do {					\
-	(elem)->trace.prevline = (elem)->trace.lastline;		\
-	(elem)->trace.prevfile = (elem)->trace.lastfile;		\
-	(elem)->trace.lastline = __LINE__;				\
-	(elem)->trace.lastfile = __FILE__;				\
-} while (0)
-
-#else
-#define	QMD_TRACE_ELEM(elem)
-#define	QMD_TRACE_HEAD(head)
-#define	QMD_SAVELINK(name, link)
-#define	TRACEBUF
-#define	TRACEBUF_INITIALIZER
-#define	TRASHIT(x)
-#endif	/* QUEUE_MACRO_DEBUG */
-
-#ifdef __cplusplus
-/*
- * In C++ there can be structure lists and class lists:
- */
-#define	QUEUE_TYPEOF(type) type
-#else
-#define	QUEUE_TYPEOF(type) struct type
+#ifndef EWOULDBLOCK
+#define EWOULDBLOCK WSAEWOULDBLOCK
 #endif
 
-/*
- * Singly-linked List declarations.
- */
-#define	SLIST_HEAD(name, type)						\
-struct name {								\
-	struct type *slh_first;	/* first element */			\
-}
-
-#define	SLIST_CLASS_HEAD(name, type)					\
-struct name {								\
-	class type *slh_first;	/* first element */			\
-}
-
-#define	SLIST_HEAD_INITIALIZER(head)					\
-	{ NULL }
-
-#define	SLIST_ENTRY(type)						\
-struct {								\
-	struct type *sle_next;	/* next element */			\
-}
-
-#define	SLIST_CLASS_ENTRY(type)						\
-struct {								\
-	class type *sle_next;		/* next element */		\
-}
-
-/*
- * Singly-linked List functions.
- */
-#define	SLIST_EMPTY(head)	((head)->slh_first == NULL)
-
-#define	SLIST_FIRST(head)	((head)->slh_first)
-
-#define	SLIST_FOREACH(var, head, field)					\
-	for ((var) = SLIST_FIRST((head));				\
-	    (var);							\
-	    (var) = SLIST_NEXT((var), field))
-
-#define	SLIST_FOREACH_FROM(var, head, field)				\
-	for ((var) = ((var) ? (var) : SLIST_FIRST((head)));		\
-	    (var);							\
-	    (var) = SLIST_NEXT((var), field))
-
-#define	SLIST_FOREACH_SAFE(var, head, field, tvar)			\
-	for ((var) = SLIST_FIRST((head));				\
-	    (var) && ((tvar) = SLIST_NEXT((var), field), 1);		\
-	    (var) = (tvar))
-
-#define	SLIST_FOREACH_FROM_SAFE(var, head, field, tvar)			\
-	for ((var) = ((var) ? (var) : SLIST_FIRST((head)));		\
-	    (var) && ((tvar) = SLIST_NEXT((var), field), 1);		\
-	    (var) = (tvar))
-
-#define	SLIST_FOREACH_PREVPTR(var, varp, head, field)			\
-	for ((varp) = &SLIST_FIRST((head));				\
-	    ((var) = *(varp)) != NULL;					\
-	    (varp) = &SLIST_NEXT((var), field))
-
-#define	SLIST_INIT(head) do {						\
-	SLIST_FIRST((head)) = NULL;					\
-} while (0)
-
-#define	SLIST_INSERT_AFTER(slistelm, elm, field) do {			\
-	SLIST_NEXT((elm), field) = SLIST_NEXT((slistelm), field);	\
-	SLIST_NEXT((slistelm), field) = (elm);				\
-} while (0)
-
-#define	SLIST_INSERT_HEAD(head, elm, field) do {			\
-	SLIST_NEXT((elm), field) = SLIST_FIRST((head));			\
-	SLIST_FIRST((head)) = (elm);					\
-} while (0)
-
-#define	SLIST_NEXT(elm, field)	((elm)->field.sle_next)
-
-#define	SLIST_REMOVE(head, elm, type, field) do {			\
-	QMD_SAVELINK(oldnext, (elm)->field.sle_next);			\
-	if (SLIST_FIRST((head)) == (elm)) {				\
-		SLIST_REMOVE_HEAD((head), field);			\
-	}								\
-	else {								\
-		QUEUE_TYPEOF(type) *curelm = SLIST_FIRST(head);		\
-		while (SLIST_NEXT(curelm, field) != (elm))		\
-			curelm = SLIST_NEXT(curelm, field);		\
-		SLIST_REMOVE_AFTER(curelm, field);			\
-	}								\
-	TRASHIT(*oldnext);						\
-} while (0)
-
-#define SLIST_REMOVE_AFTER(elm, field) do {				\
-	SLIST_NEXT(elm, field) =					\
-	    SLIST_NEXT(SLIST_NEXT(elm, field), field);			\
-} while (0)
-
-#define	SLIST_REMOVE_HEAD(head, field) do {				\
-	SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field);	\
-} while (0)
-
-#define SLIST_SWAP(head1, head2, type) do {				\
-	QUEUE_TYPEOF(type) *swap_first = SLIST_FIRST(head1);		\
-	SLIST_FIRST(head1) = SLIST_FIRST(head2);			\
-	SLIST_FIRST(head2) = swap_first;				\
-} while (0)
-
-/*
- * Singly-linked Tail queue declarations.
- */
-#define	STAILQ_HEAD(name, type)						\
-struct name {								\
-	struct type *stqh_first;/* first element */			\
-	struct type **stqh_last;/* addr of last next element */		\
-}
-
-#define	STAILQ_CLASS_HEAD(name, type)					\
-struct name {								\
-	class type *stqh_first;	/* first element */			\
-	class type **stqh_last;	/* addr of last next element */		\
-}
-
-#define	STAILQ_HEAD_INITIALIZER(head)					\
-	{ NULL, &(head).stqh_first }
-
-#define	STAILQ_ENTRY(type)						\
-struct {								\
-	struct type *stqe_next;	/* next element */			\
-}
-
-#define	STAILQ_CLASS_ENTRY(type)					\
-struct {								\
-	class type *stqe_next;	/* next element */			\
-}
-
-/*
- * Singly-linked Tail queue functions.
- */
-#define	STAILQ_CONCAT(head1, head2) do {				\
-	if (!STAILQ_EMPTY((head2))) {					\
-		*(head1)->stqh_last = (head2)->stqh_first;		\
-		(head1)->stqh_last = (head2)->stqh_last;		\
-		STAILQ_INIT((head2));					\
-	}								\
-} while (0)
-
-#define	STAILQ_EMPTY(head)	((head)->stqh_first == NULL)
-
-#define	STAILQ_FIRST(head)	((head)->stqh_first)
-
-#define	STAILQ_FOREACH(var, head, field)				\
-	for((var) = STAILQ_FIRST((head));				\
-	   (var);							\
-	   (var) = STAILQ_NEXT((var), field))
-
-#define	STAILQ_FOREACH_FROM(var, head, field)				\
-	for ((var) = ((var) ? (var) : STAILQ_FIRST((head)));		\
-	   (var);							\
-	   (var) = STAILQ_NEXT((var), field))
-
-#define	STAILQ_FOREACH_SAFE(var, head, field, tvar)			\
-	for ((var) = STAILQ_FIRST((head));				\
-	    (var) && ((tvar) = STAILQ_NEXT((var), field), 1);		\
-	    (var) = (tvar))
-
-#define	STAILQ_FOREACH_FROM_SAFE(var, head, field, tvar)		\
-	for ((var) = ((var) ? (var) : STAILQ_FIRST((head)));		\
-	    (var) && ((tvar) = STAILQ_NEXT((var), field), 1);		\
-	    (var) = (tvar))
-
-#define	STAILQ_INIT(head) do {						\
-	STAILQ_FIRST((head)) = NULL;					\
-	(head)->stqh_last = &STAILQ_FIRST((head));			\
-} while (0)
-
-#define	STAILQ_INSERT_AFTER(head, tqelm, elm, field) do {		\
-	if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) == NULL)\
-		(head)->stqh_last = &STAILQ_NEXT((elm), field);		\
-	STAILQ_NEXT((tqelm), field) = (elm);				\
-} while (0)
-
-#define	STAILQ_INSERT_HEAD(head, elm, field) do {			\
-	if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) == NULL)	\
-		(head)->stqh_last = &STAILQ_NEXT((elm), field);		\
-	STAILQ_FIRST((head)) = (elm);					\
-} while (0)
-
-#define	STAILQ_INSERT_TAIL(head, elm, field) do {			\
-	STAILQ_NEXT((elm), field) = NULL;				\
-	*(head)->stqh_last = (elm);					\
-	(head)->stqh_last = &STAILQ_NEXT((elm), field);			\
-} while (0)
-
-#define	STAILQ_LAST(head, type, field)				\
-	(STAILQ_EMPTY((head)) ? NULL :				\
-	    __containerof((head)->stqh_last,			\
-	    QUEUE_TYPEOF(type), field.stqe_next))
-
-#define	STAILQ_NEXT(elm, field)	((elm)->field.stqe_next)
-
-#define	STAILQ_REMOVE(head, elm, type, field) do {			\
-	QMD_SAVELINK(oldnext, (elm)->field.stqe_next);			\
-	if (STAILQ_FIRST((head)) == (elm)) {				\
-		STAILQ_REMOVE_HEAD((head), field);			\
-	}								\
-	else {								\
-		QUEUE_TYPEOF(type) *curelm = STAILQ_FIRST(head);	\
-		while (STAILQ_NEXT(curelm, field) != (elm))		\
-			curelm = STAILQ_NEXT(curelm, field);		\
-		STAILQ_REMOVE_AFTER(head, curelm, field);		\
-	}								\
-	TRASHIT(*oldnext);						\
-} while (0)
-
-#define STAILQ_REMOVE_AFTER(head, elm, field) do {			\
-	if ((STAILQ_NEXT(elm, field) =					\
-	     STAILQ_NEXT(STAILQ_NEXT(elm, field), field)) == NULL)	\
-		(head)->stqh_last = &STAILQ_NEXT((elm), field);		\
-} while (0)
-
-#define	STAILQ_REMOVE_HEAD(head, field) do {				\
-	if ((STAILQ_FIRST((head)) =					\
-	     STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL)		\
-		(head)->stqh_last = &STAILQ_FIRST((head));		\
-} while (0)
-
-#define STAILQ_SWAP(head1, head2, type) do {				\
-	QUEUE_TYPEOF(type) *swap_first = STAILQ_FIRST(head1);		\
-	QUEUE_TYPEOF(type) **swap_last = (head1)->stqh_last;		\
-	STAILQ_FIRST(head1) = STAILQ_FIRST(head2);			\
-	(head1)->stqh_last = (head2)->stqh_last;			\
-	STAILQ_FIRST(head2) = swap_first;				\
-	(head2)->stqh_last = swap_last;					\
-	if (STAILQ_EMPTY(head1))					\
-		(head1)->stqh_last = &STAILQ_FIRST(head1);		\
-	if (STAILQ_EMPTY(head2))					\
-		(head2)->stqh_last = &STAILQ_FIRST(head2);		\
-} while (0)
-
-
-/*
- * List declarations.
- */
-#define	LIST_HEAD(name, type)						\
-struct name {								\
-	struct type *lh_first;	/* first element */			\
-}
-
-#define	LIST_CLASS_HEAD(name, type)					\
-struct name {								\
-	class type *lh_first;	/* first element */			\
-}
-
-#define	LIST_HEAD_INITIALIZER(head)					\
-	{ NULL }
+#define realpath(a, b) _fullpath((b), (a), MG_PATH_MAX)
+#define sleep(x) Sleep(x)
+#define mkdir(a, b) _mkdir(a)
 
-#define	LIST_ENTRY(type)						\
-struct {								\
-	struct type *le_next;	/* next element */			\
-	struct type **le_prev;	/* address of previous next element */	\
-}
-
-#define	LIST_CLASS_ENTRY(type)						\
-struct {								\
-	class type *le_next;	/* next element */			\
-	class type **le_prev;	/* address of previous next element */	\
-}
-
-/*
- * List functions.
- */
-
-#if (defined(_KERNEL) && defined(INVARIANTS))
-#define	QMD_LIST_CHECK_HEAD(head, field) do {				\
-	if (LIST_FIRST((head)) != NULL &&				\
-	    LIST_FIRST((head))->field.le_prev !=			\
-	     &LIST_FIRST((head)))					\
-		panic("Bad list head %p first->prev != head", (head));	\
-} while (0)
-
-#define	QMD_LIST_CHECK_NEXT(elm, field) do {				\
-	if (LIST_NEXT((elm), field) != NULL &&				\
-	    LIST_NEXT((elm), field)->field.le_prev !=			\
-	     &((elm)->field.le_next))					\
-		panic("Bad link elm %p next->prev != elm", (elm));	\
-} while (0)
-
-#define	QMD_LIST_CHECK_PREV(elm, field) do {				\
-	if (*(elm)->field.le_prev != (elm))				\
-		panic("Bad link elm %p prev->next != elm", (elm));	\
-} while (0)
-#else
-#define	QMD_LIST_CHECK_HEAD(head, field)
-#define	QMD_LIST_CHECK_NEXT(elm, field)
-#define	QMD_LIST_CHECK_PREV(elm, field)
-#endif /* (_KERNEL && INVARIANTS) */
-
-#define	LIST_EMPTY(head)	((head)->lh_first == NULL)
-
-#define	LIST_FIRST(head)	((head)->lh_first)
-
-#define	LIST_FOREACH(var, head, field)					\
-	for ((var) = LIST_FIRST((head));				\
-	    (var);							\
-	    (var) = LIST_NEXT((var), field))
-
-#define	LIST_FOREACH_FROM(var, head, field)				\
-	for ((var) = ((var) ? (var) : LIST_FIRST((head)));		\
-	    (var);							\
-	    (var) = LIST_NEXT((var), field))
-
-#define	LIST_FOREACH_SAFE(var, head, field, tvar)			\
-	for ((var) = LIST_FIRST((head));				\
-	    (var) && ((tvar) = LIST_NEXT((var), field), 1);		\
-	    (var) = (tvar))
-
-#define	LIST_FOREACH_FROM_SAFE(var, head, field, tvar)			\
-	for ((var) = ((var) ? (var) : LIST_FIRST((head)));		\
-	    (var) && ((tvar) = LIST_NEXT((var), field), 1);		\
-	    (var) = (tvar))
-
-#define	LIST_INIT(head) do {						\
-	LIST_FIRST((head)) = NULL;					\
-} while (0)
-
-#define	LIST_INSERT_AFTER(listelm, elm, field) do {			\
-	QMD_LIST_CHECK_NEXT(listelm, field);				\
-	if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)\
-		LIST_NEXT((listelm), field)->field.le_prev =		\
-		    &LIST_NEXT((elm), field);				\
-	LIST_NEXT((listelm), field) = (elm);				\
-	(elm)->field.le_prev = &LIST_NEXT((listelm), field);		\
-} while (0)
-
-#define	LIST_INSERT_BEFORE(listelm, elm, field) do {			\
-	QMD_LIST_CHECK_PREV(listelm, field);				\
-	(elm)->field.le_prev = (listelm)->field.le_prev;		\
-	LIST_NEXT((elm), field) = (listelm);				\
-	*(listelm)->field.le_prev = (elm);				\
-	(listelm)->field.le_prev = &LIST_NEXT((elm), field);		\
-} while (0)
-
-#define	LIST_INSERT_HEAD(head, elm, field) do {				\
-	QMD_LIST_CHECK_HEAD((head), field);				\
-	if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL)	\
-		LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\
-	LIST_FIRST((head)) = (elm);					\
-	(elm)->field.le_prev = &LIST_FIRST((head));			\
-} while (0)
-
-#define	LIST_NEXT(elm, field)	((elm)->field.le_next)
-
-#define	LIST_PREV(elm, head, type, field)			\
-	((elm)->field.le_prev == &LIST_FIRST((head)) ? NULL :	\
-	    __containerof((elm)->field.le_prev,			\
-	    QUEUE_TYPEOF(type), field.le_next))
-
-#define	LIST_REMOVE(elm, field) do {					\
-	QMD_SAVELINK(oldnext, (elm)->field.le_next);			\
-	QMD_SAVELINK(oldprev, (elm)->field.le_prev);			\
-	QMD_LIST_CHECK_NEXT(elm, field);				\
-	QMD_LIST_CHECK_PREV(elm, field);				\
-	if (LIST_NEXT((elm), field) != NULL)				\
-		LIST_NEXT((elm), field)->field.le_prev = 		\
-		    (elm)->field.le_prev;				\
-	*(elm)->field.le_prev = LIST_NEXT((elm), field);		\
-	TRASHIT(*oldnext);						\
-	TRASHIT(*oldprev);						\
-} while (0)
-
-#define LIST_SWAP(head1, head2, type, field) do {			\
-	QUEUE_TYPEOF(type) *swap_tmp = LIST_FIRST(head1);		\
-	LIST_FIRST((head1)) = LIST_FIRST((head2));			\
-	LIST_FIRST((head2)) = swap_tmp;					\
-	if ((swap_tmp = LIST_FIRST((head1))) != NULL)			\
-		swap_tmp->field.le_prev = &LIST_FIRST((head1));		\
-	if ((swap_tmp = LIST_FIRST((head2))) != NULL)			\
-		swap_tmp->field.le_prev = &LIST_FIRST((head2));		\
-} while (0)
-
-/*
- * Tail queue declarations.
- */
-#define	TAILQ_HEAD(name, type)						\
-struct name {								\
-	struct type *tqh_first;	/* first element */			\
-	struct type **tqh_last;	/* addr of last next element */		\
-	TRACEBUF							\
-}
-
-#define	TAILQ_CLASS_HEAD(name, type)					\
-struct name {								\
-	class type *tqh_first;	/* first element */			\
-	class type **tqh_last;	/* addr of last next element */		\
-	TRACEBUF							\
-}
-
-#define	TAILQ_HEAD_INITIALIZER(head)					\
-	{ NULL, &(head).tqh_first, TRACEBUF_INITIALIZER }
-
-#define	TAILQ_ENTRY(type)						\
-struct {								\
-	struct type *tqe_next;	/* next element */			\
-	struct type **tqe_prev;	/* address of previous next element */	\
-	TRACEBUF							\
-}
-
-#define	TAILQ_CLASS_ENTRY(type)						\
-struct {								\
-	class type *tqe_next;	/* next element */			\
-	class type **tqe_prev;	/* address of previous next element */	\
-	TRACEBUF							\
-}
-
-/*
- * Tail queue functions.
- */
-#if (defined(_KERNEL) && defined(INVARIANTS))
-#define	QMD_TAILQ_CHECK_HEAD(head, field) do {				\
-	if (!TAILQ_EMPTY(head) &&					\
-	    TAILQ_FIRST((head))->field.tqe_prev !=			\
-	     &TAILQ_FIRST((head)))					\
-		panic("Bad tailq head %p first->prev != head", (head));	\
-} while (0)
-
-#define	QMD_TAILQ_CHECK_TAIL(head, field) do {				\
-	if (*(head)->tqh_last != NULL)					\
-		panic("Bad tailq NEXT(%p->tqh_last) != NULL", (head)); 	\
-} while (0)
-
-#define	QMD_TAILQ_CHECK_NEXT(elm, field) do {				\
-	if (TAILQ_NEXT((elm), field) != NULL &&				\
-	    TAILQ_NEXT((elm), field)->field.tqe_prev !=			\
-	     &((elm)->field.tqe_next))					\
-		panic("Bad link elm %p next->prev != elm", (elm));	\
-} while (0)
-
-#define	QMD_TAILQ_CHECK_PREV(elm, field) do {				\
-	if (*(elm)->field.tqe_prev != (elm))				\
-		panic("Bad link elm %p prev->next != elm", (elm));	\
-} while (0)
+#ifndef va_copy
+#ifdef __va_copy
+#define va_copy __va_copy
 #else
-#define	QMD_TAILQ_CHECK_HEAD(head, field)
-#define	QMD_TAILQ_CHECK_TAIL(head, headname)
-#define	QMD_TAILQ_CHECK_NEXT(elm, field)
-#define	QMD_TAILQ_CHECK_PREV(elm, field)
-#endif /* (_KERNEL && INVARIANTS) */
-
-#define	TAILQ_CONCAT(head1, head2, field) do {				\
-	if (!TAILQ_EMPTY(head2)) {					\
-		*(head1)->tqh_last = (head2)->tqh_first;		\
-		(head2)->tqh_first->field.tqe_prev = (head1)->tqh_last;	\
-		(head1)->tqh_last = (head2)->tqh_last;			\
-		TAILQ_INIT((head2));					\
-		QMD_TRACE_HEAD(head1);					\
-		QMD_TRACE_HEAD(head2);					\
-	}								\
-} while (0)
-
-#define	TAILQ_EMPTY(head)	((head)->tqh_first == NULL)
-
-#define	TAILQ_FIRST(head)	((head)->tqh_first)
-
-#define	TAILQ_FOREACH(var, head, field)					\
-	for ((var) = TAILQ_FIRST((head));				\
-	    (var);							\
-	    (var) = TAILQ_NEXT((var), field))
-
-#define	TAILQ_FOREACH_FROM(var, head, field)				\
-	for ((var) = ((var) ? (var) : TAILQ_FIRST((head)));		\
-	    (var);							\
-	    (var) = TAILQ_NEXT((var), field))
-
-#define	TAILQ_FOREACH_SAFE(var, head, field, tvar)			\
-	for ((var) = TAILQ_FIRST((head));				\
-	    (var) && ((tvar) = TAILQ_NEXT((var), field), 1);		\
-	    (var) = (tvar))
-
-#define	TAILQ_FOREACH_FROM_SAFE(var, head, field, tvar)			\
-	for ((var) = ((var) ? (var) : TAILQ_FIRST((head)));		\
-	    (var) && ((tvar) = TAILQ_NEXT((var), field), 1);		\
-	    (var) = (tvar))
-
-#define	TAILQ_FOREACH_REVERSE(var, head, headname, field)		\
-	for ((var) = TAILQ_LAST((head), headname);			\
-	    (var);							\
-	    (var) = TAILQ_PREV((var), headname, field))
-
-#define	TAILQ_FOREACH_REVERSE_FROM(var, head, headname, field)		\
-	for ((var) = ((var) ? (var) : TAILQ_LAST((head), headname));	\
-	    (var);							\
-	    (var) = TAILQ_PREV((var), headname, field))
-
-#define	TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar)	\
-	for ((var) = TAILQ_LAST((head), headname);			\
-	    (var) && ((tvar) = TAILQ_PREV((var), headname, field), 1);	\
-	    (var) = (tvar))
-
-#define	TAILQ_FOREACH_REVERSE_FROM_SAFE(var, head, headname, field, tvar) \
-	for ((var) = ((var) ? (var) : TAILQ_LAST((head), headname));	\
-	    (var) && ((tvar) = TAILQ_PREV((var), headname, field), 1);	\
-	    (var) = (tvar))
-
-#define	TAILQ_INIT(head) do {						\
-	TAILQ_FIRST((head)) = NULL;					\
-	(head)->tqh_last = &TAILQ_FIRST((head));			\
-	QMD_TRACE_HEAD(head);						\
-} while (0)
-
-#define	TAILQ_INSERT_AFTER(head, listelm, elm, field) do {		\
-	QMD_TAILQ_CHECK_NEXT(listelm, field);				\
-	if ((TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field)) != NULL)\
-		TAILQ_NEXT((elm), field)->field.tqe_prev = 		\
-		    &TAILQ_NEXT((elm), field);				\
-	else {								\
-		(head)->tqh_last = &TAILQ_NEXT((elm), field);		\
-		QMD_TRACE_HEAD(head);					\
-	}								\
-	TAILQ_NEXT((listelm), field) = (elm);				\
-	(elm)->field.tqe_prev = &TAILQ_NEXT((listelm), field);		\
-	QMD_TRACE_ELEM(&(elm)->field);					\
-	QMD_TRACE_ELEM(&(listelm)->field);				\
-} while (0)
-
-#define	TAILQ_INSERT_BEFORE(listelm, elm, field) do {			\
-	QMD_TAILQ_CHECK_PREV(listelm, field);				\
-	(elm)->field.tqe_prev = (listelm)->field.tqe_prev;		\
-	TAILQ_NEXT((elm), field) = (listelm);				\
-	*(listelm)->field.tqe_prev = (elm);				\
-	(listelm)->field.tqe_prev = &TAILQ_NEXT((elm), field);		\
-	QMD_TRACE_ELEM(&(elm)->field);					\
-	QMD_TRACE_ELEM(&(listelm)->field);				\
-} while (0)
-
-#define	TAILQ_INSERT_HEAD(head, elm, field) do {			\
-	QMD_TAILQ_CHECK_HEAD(head, field);				\
-	if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL)	\
-		TAILQ_FIRST((head))->field.tqe_prev =			\
-		    &TAILQ_NEXT((elm), field);				\
-	else								\
-		(head)->tqh_last = &TAILQ_NEXT((elm), field);		\
-	TAILQ_FIRST((head)) = (elm);					\
-	(elm)->field.tqe_prev = &TAILQ_FIRST((head));			\
-	QMD_TRACE_HEAD(head);						\
-	QMD_TRACE_ELEM(&(elm)->field);					\
-} while (0)
-
-#define	TAILQ_INSERT_TAIL(head, elm, field) do {			\
-	QMD_TAILQ_CHECK_TAIL(head, field);				\
-	TAILQ_NEXT((elm), field) = NULL;				\
-	(elm)->field.tqe_prev = (head)->tqh_last;			\
-	*(head)->tqh_last = (elm);					\
-	(head)->tqh_last = &TAILQ_NEXT((elm), field);			\
-	QMD_TRACE_HEAD(head);						\
-	QMD_TRACE_ELEM(&(elm)->field);					\
-} while (0)
-
-#define	TAILQ_LAST(head, headname)					\
-	(*(((struct headname *)((head)->tqh_last))->tqh_last))
-
-#define	TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
-
-#define	TAILQ_PREV(elm, headname, field)				\
-	(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
-
-#define	TAILQ_REMOVE(head, elm, field) do {				\
-	QMD_SAVELINK(oldnext, (elm)->field.tqe_next);			\
-	QMD_SAVELINK(oldprev, (elm)->field.tqe_prev);			\
-	QMD_TAILQ_CHECK_NEXT(elm, field);				\
-	QMD_TAILQ_CHECK_PREV(elm, field);				\
-	if ((TAILQ_NEXT((elm), field)) != NULL)				\
-		TAILQ_NEXT((elm), field)->field.tqe_prev = 		\
-		    (elm)->field.tqe_prev;				\
-	else {								\
-		(head)->tqh_last = (elm)->field.tqe_prev;		\
-		QMD_TRACE_HEAD(head);					\
-	}								\
-	*(elm)->field.tqe_prev = TAILQ_NEXT((elm), field);		\
-	TRASHIT(*oldnext);						\
-	TRASHIT(*oldprev);						\
-	QMD_TRACE_ELEM(&(elm)->field);					\
-} while (0)
-
-#define TAILQ_SWAP(head1, head2, type, field) do {			\
-	QUEUE_TYPEOF(type) *swap_first = (head1)->tqh_first;		\
-	QUEUE_TYPEOF(type) **swap_last = (head1)->tqh_last;		\
-	(head1)->tqh_first = (head2)->tqh_first;			\
-	(head1)->tqh_last = (head2)->tqh_last;				\
-	(head2)->tqh_first = swap_first;				\
-	(head2)->tqh_last = swap_last;					\
-	if ((swap_first = (head1)->tqh_first) != NULL)			\
-		swap_first->field.tqe_prev = &(head1)->tqh_first;	\
-	else								\
-		(head1)->tqh_last = &(head1)->tqh_first;		\
-	if ((swap_first = (head2)->tqh_first) != NULL)			\
-		swap_first->field.tqe_prev = &(head2)->tqh_first;	\
-	else								\
-		(head2)->tqh_last = &(head2)->tqh_first;		\
-} while (0)
-
-#endif /* !_SYS_QUEUE_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_features.h"
-#endif
-
-#ifndef CS_MONGOOSE_SRC_FEATURES_H_
-#define CS_MONGOOSE_SRC_FEATURES_H_
-
-#ifndef MG_DISABLE_HTTP_DIGEST_AUTH
-#define MG_DISABLE_HTTP_DIGEST_AUTH 0
-#endif
-
-#ifndef MG_DISABLE_HTTP_KEEP_ALIVE
-#define MG_DISABLE_HTTP_KEEP_ALIVE 0
-#endif
-
-#ifndef MG_DISABLE_PFS
-#define MG_DISABLE_PFS 0
-#endif
-
-#ifndef MG_DISABLE_WS_RANDOM_MASK
-#define MG_DISABLE_WS_RANDOM_MASK 0
-#endif
-
-#ifndef MG_ENABLE_ASYNC_RESOLVER
-#define MG_ENABLE_ASYNC_RESOLVER 1
-#endif
-
-#ifndef MG_ENABLE_BROADCAST
-#define MG_ENABLE_BROADCAST 0
+#define va_copy(x, y) (x) = (y)
 #endif
-
-#ifndef MG_ENABLE_COAP
-#define MG_ENABLE_COAP 0
 #endif
-
-#ifndef MG_ENABLE_DEBUG
-#define MG_ENABLE_DEBUG 0
+#ifndef S_ISDIR
+#define S_ISDIR(x) (((x) &_S_IFMT) == _S_IFDIR)
 #endif
 
-#ifndef MG_ENABLE_DIRECTORY_LISTING
-#define MG_ENABLE_DIRECTORY_LISTING 0
-#endif
+#define MG_INT64_FMT "%I64d"
 
-#ifndef MG_ENABLE_DNS
-#define MG_ENABLE_DNS 1
+#ifndef MG_ENABLE_DIRLIST
+#define MG_ENABLE_DIRLIST 1
 #endif
 
-#ifndef MG_ENABLE_DNS_SERVER
-#define MG_ENABLE_DNS_SERVER 0
-#endif
+// https://lgtm.com/rules/2154840805/ -gmtime, localtime, ctime and asctime
+static __inline struct tm *gmtime_r(const time_t *t, struct tm *tm) {
+  struct tm *x = gmtime(t);
+  *tm = *x;
+  return tm;
+}
 
-#ifndef MG_ENABLE_FAKE_DAVLOCK
-#define MG_ENABLE_FAKE_DAVLOCK 0
-#endif
+static __inline struct tm *localtime_r(const time_t *t, struct tm *tm) {
+  struct tm *x = localtime(t);
+  *tm = *x;
+  return tm;
+}
 
-#ifndef MG_ENABLE_FILESYSTEM
-#define MG_ENABLE_FILESYSTEM 0
 #endif
 
-#ifndef MG_ENABLE_GETADDRINFO
-#define MG_ENABLE_GETADDRINFO 0
-#endif
 
-#ifndef MG_ENABLE_HEXDUMP
-#define MG_ENABLE_HEXDUMP CS_ENABLE_STDIO
+#ifndef MG_ENABLE_FATFS
+#define MG_ENABLE_FATFS 0
 #endif
 
-#ifndef MG_ENABLE_HTTP
-#define MG_ENABLE_HTTP 1
+#ifndef MG_FATFS_ROOT
+#define MG_FATFS_ROOT "/"
 #endif
 
-#ifndef MG_ENABLE_HTTP_CGI
-#define MG_ENABLE_HTTP_CGI 0
+#ifndef MG_FATFS_BSIZE
+#define MG_FATFS_BSIZE 64
 #endif
 
-#ifndef MG_ENABLE_HTTP_SSI
-#define MG_ENABLE_HTTP_SSI MG_ENABLE_FILESYSTEM
+#ifndef MG_ENABLE_SOCKET
+#define MG_ENABLE_SOCKET 1
 #endif
 
-#ifndef MG_ENABLE_HTTP_SSI_EXEC
-#define MG_ENABLE_HTTP_SSI_EXEC 0
+#ifndef MG_ENABLE_MBEDTLS
+#define MG_ENABLE_MBEDTLS 0
 #endif
 
-#ifndef MG_ENABLE_HTTP_STREAMING_MULTIPART
-#define MG_ENABLE_HTTP_STREAMING_MULTIPART 0
+#ifndef MG_ENABLE_OPENSSL
+#define MG_ENABLE_OPENSSL 0
 #endif
 
-#ifndef MG_ENABLE_HTTP_WEBDAV
-#define MG_ENABLE_HTTP_WEBDAV 0
+#ifndef MG_ENABLE_CUSTOM_TLS
+#define MG_ENABLE_CUSTOM_TLS 0
 #endif
 
-#ifndef MG_ENABLE_HTTP_WEBSOCKET
-#define MG_ENABLE_HTTP_WEBSOCKET MG_ENABLE_HTTP
+#ifndef MG_ENABLE_SSI
+#define MG_ENABLE_SSI 1
 #endif
 
 #ifndef MG_ENABLE_IPV6
 #define MG_ENABLE_IPV6 0
 #endif
 
-#ifndef MG_ENABLE_MQTT
-#define MG_ENABLE_MQTT 1
+#ifndef MG_ENABLE_LOG
+#define MG_ENABLE_LOG 1
 #endif
 
-#ifndef MG_ENABLE_SOCKS
-#define MG_ENABLE_SOCKS 0
+#ifndef MG_ENABLE_MD5
+#define MG_ENABLE_MD5 0
 #endif
 
-#ifndef MG_ENABLE_MQTT_BROKER
-#define MG_ENABLE_MQTT_BROKER 0
+// Set MG_ENABLE_WINSOCK=0 for Win32 builds with external IP stack (like LWIP)
+#ifndef MG_ENABLE_WINSOCK
+#define MG_ENABLE_WINSOCK 1
 #endif
 
-#ifndef MG_ENABLE_SSL
-#define MG_ENABLE_SSL 0
+#ifndef MG_ENABLE_DIRLIST
+#define MG_ENABLE_DIRLIST 0
 #endif
 
-#ifndef MG_ENABLE_SYNC_RESOLVER
-#define MG_ENABLE_SYNC_RESOLVER 0
+#ifndef MG_ENABLE_CUSTOM_RANDOM
+#define MG_ENABLE_CUSTOM_RANDOM 0
 #endif
 
-#ifndef MG_ENABLE_STDIO
-#define MG_ENABLE_STDIO CS_ENABLE_STDIO
+#ifndef MG_ENABLE_PACKED_FS
+#define MG_ENABLE_PACKED_FS 0
 #endif
 
-#ifndef MG_NET_IF
-#define MG_NET_IF MG_NET_IF_SOCKET
+// Granularity of the send/recv IO buffer growth
+#ifndef MG_IO_SIZE
+#define MG_IO_SIZE 2048
 #endif
 
-#ifndef MG_SSL_IF
-#define MG_SSL_IF MG_SSL_IF_OPENSSL
+// Maximum size of the recv IO buffer
+#ifndef MG_MAX_RECV_BUF_SIZE
+#define MG_MAX_RECV_BUF_SIZE (3 * 1024 * 1024)
 #endif
 
-#ifndef MG_ENABLE_THREADS /* ifdef-ok */
-#ifdef _WIN32
-#define MG_ENABLE_THREADS 1
-#else
-#define MG_ENABLE_THREADS 0
-#endif
+#ifndef MG_MAX_HTTP_HEADERS
+#define MG_MAX_HTTP_HEADERS 40
 #endif
 
-#if MG_ENABLE_DEBUG && !defined(CS_ENABLE_DEBUG)
-#define CS_ENABLE_DEBUG 1
+#ifndef MG_HTTP_INDEX
+#define MG_HTTP_INDEX "index.html"
 #endif
 
-/* MQTT broker requires MQTT */
-#if MG_ENABLE_MQTT_BROKER && !MG_ENABLE_MQTT
-#undef MG_ENABLE_MQTT
-#define MG_ENABLE_MQTT 1
+#ifndef MG_PATH_MAX
+#ifdef PATH_MAX
+#define MG_PATH_MAX PATH_MAX
+#else
+#define MG_PATH_MAX 128
 #endif
-
-#ifndef MG_ENABLE_HTTP_URL_REWRITES
-#define MG_ENABLE_HTTP_URL_REWRITES \
-  (CS_PLATFORM == CS_P_WINDOWS || CS_PLATFORM == CS_P_UNIX)
 #endif
 
-#ifndef MG_ENABLE_SNTP
-#define MG_ENABLE_SNTP 0
+#ifndef MG_SOCK_LISTEN_BACKLOG_SIZE
+#define MG_SOCK_LISTEN_BACKLOG_SIZE 128
 #endif
 
-#ifndef MG_ENABLE_EXTRA_ERRORS_DESC
-#define MG_ENABLE_EXTRA_ERRORS_DESC 0
+#ifndef MG_DIRSEP
+#define MG_DIRSEP '/'
 #endif
 
-#ifndef MG_ENABLE_CALLBACK_USERDATA
-#define MG_ENABLE_CALLBACK_USERDATA 0
+#ifndef MG_INT64_FMT
+#define MG_INT64_FMT "%lld"
 #endif
 
-#if MG_ENABLE_CALLBACK_USERDATA
-#define MG_UD_ARG(ud) , ud
-#define MG_CB(cb, ud) cb, ud
+#ifndef MG_ENABLE_FILE
+#if defined(FOPEN_MAX)
+#define MG_ENABLE_FILE 1
 #else
-#define MG_UD_ARG(ud)
-#define MG_CB(cb, ud) cb
+#define MG_ENABLE_FILE 0
 #endif
-
-#endif /* CS_MONGOOSE_SRC_FEATURES_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_net_if.h"
-#endif
-
-#ifndef CS_MONGOOSE_SRC_NET_IF_H_
-#define CS_MONGOOSE_SRC_NET_IF_H_
-
-/* Amalgamated: #include "common/platform.h" */
-
-/*
- * Internal async networking core interface.
- * Consists of calls made by the core, which should not block,
- * and callbacks back into the core ("..._cb").
- * Callbacks may (will) cause methods to be invoked from within,
- * but methods are not allowed to invoke callbacks inline.
- *
- * Implementation must ensure that only one callback is invoked at any time.
- */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-#define MG_MAIN_IFACE 0
-
-struct mg_mgr;
-struct mg_connection;
-union socket_address;
-
-struct mg_iface_vtable;
-
-struct mg_iface {
-  struct mg_mgr *mgr;
-  void *data; /* Implementation-specific data */
-  const struct mg_iface_vtable *vtable;
-};
-
-struct mg_iface_vtable {
-  void (*init)(struct mg_iface *iface);
-  void (*free)(struct mg_iface *iface);
-  void (*add_conn)(struct mg_connection *nc);
-  void (*remove_conn)(struct mg_connection *nc);
-  time_t (*poll)(struct mg_iface *iface, int timeout_ms);
-
-  /* Set up a listening TCP socket on a given address. rv = 0 -> ok. */
-  int (*listen_tcp)(struct mg_connection *nc, union socket_address *sa);
-  /* Request that a "listening" UDP socket be created. */
-  int (*listen_udp)(struct mg_connection *nc, union socket_address *sa);
-
-  /* Request that a TCP connection is made to the specified address. */
-  void (*connect_tcp)(struct mg_connection *nc, const union socket_address *sa);
-  /* Open a UDP socket. Doesn't actually connect anything. */
-  void (*connect_udp)(struct mg_connection *nc);
-
-  /* Send functions for TCP and UDP. Sent data is copied before return. */
-  int (*tcp_send)(struct mg_connection *nc, const void *buf, size_t len);
-  int (*udp_send)(struct mg_connection *nc, const void *buf, size_t len);
-
-  int (*tcp_recv)(struct mg_connection *nc, void *buf, size_t len);
-  int (*udp_recv)(struct mg_connection *nc, void *buf, size_t len,
-                  union socket_address *sa, size_t *sa_len);
-
-  /* Perform interface-related connection initialization. Return 1 on ok. */
-  int (*create_conn)(struct mg_connection *nc);
-  /* Perform interface-related cleanup on connection before destruction. */
-  void (*destroy_conn)(struct mg_connection *nc);
-
-  /* Associate a socket to a connection. */
-  void (*sock_set)(struct mg_connection *nc, sock_t sock);
-
-  /* Put connection's address into *sa, local (remote = 0) or remote. */
-  void (*get_conn_addr)(struct mg_connection *nc, int remote,
-                        union socket_address *sa);
-};
-
-extern const struct mg_iface_vtable *mg_ifaces[];
-extern int mg_num_ifaces;
-
-/* Creates a new interface instance. */
-struct mg_iface *mg_if_create_iface(const struct mg_iface_vtable *vtable,
-                                    struct mg_mgr *mgr);
-
-/*
- * Find an interface with a given implementation. The search is started from
- * interface `from`, exclusive. Returns NULL if none is found.
- */
-struct mg_iface *mg_find_iface(struct mg_mgr *mgr,
-                               const struct mg_iface_vtable *vtable,
-                               struct mg_iface *from);
-/*
- * Deliver a new TCP connection. Returns NULL in case on error (unable to
- * create connection, in which case interface state should be discarded.
- * This is phase 1 of the two-phase process - MG_EV_ACCEPT will be delivered
- * when mg_if_accept_tcp_cb is invoked.
- */
-struct mg_connection *mg_if_accept_new_conn(struct mg_connection *lc);
-void mg_if_accept_tcp_cb(struct mg_connection *nc, union socket_address *sa,
-                         size_t sa_len);
-
-/* Callback invoked by connect methods. err = 0 -> ok, != 0 -> error. */
-void mg_if_connect_cb(struct mg_connection *nc, int err);
-/*
- * Callback that tells the core that data can be received.
- * Core will use tcp/udp_recv to retrieve the data.
- */
-void mg_if_can_recv_cb(struct mg_connection *nc);
-void mg_if_can_send_cb(struct mg_connection *nc);
-/*
- * Receive callback.
- * buf must be heap-allocated and ownership is transferred to the core.
- */
-void mg_if_recv_udp_cb(struct mg_connection *nc, void *buf, int len,
-                       union socket_address *sa, size_t sa_len);
-
-/* void mg_if_close_conn(struct mg_connection *nc); */
-
-/* Deliver a POLL event to the connection. */
-int mg_if_poll(struct mg_connection *nc, double now);
-
-/*
- * Return minimal timer value amoung connections in the manager.
- * Returns 0 if there aren't any timers.
- */
-double mg_mgr_min_timer(const struct mg_mgr *mgr);
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* CS_MONGOOSE_SRC_NET_IF_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_ssl_if.h"
 #endif
 
-#ifndef CS_MONGOOSE_SRC_SSL_IF_H_
-#define CS_MONGOOSE_SRC_SSL_IF_H_
-
-#if MG_ENABLE_SSL
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-struct mg_ssl_if_ctx;
-struct mg_connection;
 
-void mg_ssl_if_init(void);
 
-enum mg_ssl_if_result {
-  MG_SSL_OK = 0,
-  MG_SSL_WANT_READ = -1,
-  MG_SSL_WANT_WRITE = -2,
-  MG_SSL_ERROR = -3,
-};
 
-struct mg_ssl_if_conn_params {
-  const char *cert;
-  const char *key;
-  const char *ca_cert;
-  const char *server_name;
-  const char *cipher_suites;
-  const char *psk_identity;
-  const char *psk_key;
+struct mg_str {
+  const char *ptr;  // Pointer to string data
+  size_t len;       // String len
 };
 
-enum mg_ssl_if_result mg_ssl_if_conn_init(
-    struct mg_connection *nc, const struct mg_ssl_if_conn_params *params,
-    const char **err_msg);
-enum mg_ssl_if_result mg_ssl_if_conn_accept(struct mg_connection *nc,
-                                            struct mg_connection *lc);
-void mg_ssl_if_conn_close_notify(struct mg_connection *nc);
-void mg_ssl_if_conn_free(struct mg_connection *nc);
-
-enum mg_ssl_if_result mg_ssl_if_handshake(struct mg_connection *nc);
-int mg_ssl_if_read(struct mg_connection *nc, void *buf, size_t buf_size);
-int mg_ssl_if_write(struct mg_connection *nc, const void *data, size_t len);
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* MG_ENABLE_SSL */
-
-#endif /* CS_MONGOOSE_SRC_SSL_IF_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_net.h"
-#endif
+#define MG_NULL_STR \
+  { NULL, 0 }
 
-/*
- * === Core API: TCP/UDP/SSL
- *
- * NOTE: Mongoose manager is single threaded. It does not protect
- * its data structures by mutexes, therefore all functions that are dealing
- * with a particular event manager should be called from the same thread,
- * with exception of the `mg_broadcast()` function. It is fine to have different
- * event managers handled by different threads.
- */
-
-#ifndef CS_MONGOOSE_SRC_NET_H_
-#define CS_MONGOOSE_SRC_NET_H_
-
-/* Amalgamated: #include "mg_common.h" */
-/* Amalgamated: #include "mg_net_if.h" */
-/* Amalgamated: #include "common/mbuf.h" */
-
-#ifndef MG_VPRINTF_BUFFER_SIZE
-#define MG_VPRINTF_BUFFER_SIZE 100
-#endif
+// Using macro to avoid shadowing C++ struct constructor, see #1298
+#define mg_str(s) mg_str_s(s)
 
-#ifdef MG_USE_READ_WRITE
-#define MG_RECV_FUNC(s, b, l, f) read(s, b, l)
-#define MG_SEND_FUNC(s, b, l, f) write(s, b, l)
-#else
-#define MG_RECV_FUNC(s, b, l, f) recv(s, b, l, f)
-#define MG_SEND_FUNC(s, b, l, f) send(s, b, l, f)
-#endif
+struct mg_str mg_str(const char *s);
+struct mg_str mg_str_n(const char *s, size_t n);
+int mg_lower(const char *s);
+int mg_ncasecmp(const char *s1, const char *s2, size_t len);
+int mg_casecmp(const char *s1, const char *s2);
+int mg_vcmp(const struct mg_str *s1, const char *s2);
+int mg_vcasecmp(const struct mg_str *str1, const char *str2);
+int mg_strcmp(const struct mg_str str1, const struct mg_str str2);
+struct mg_str mg_strstrip(struct mg_str s);
+struct mg_str mg_strdup(const struct mg_str s);
+const char *mg_strstr(const struct mg_str haystack, const struct mg_str needle);
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
 
-union socket_address {
-  struct sockaddr sa;
-  struct sockaddr_in sin;
-#if MG_ENABLE_IPV6
-  struct sockaddr_in6 sin6;
-#else
-  struct sockaddr sin6;
-#endif
-};
 
-struct mg_connection;
 
-/*
- * Callback function (event handler) prototype. Must be defined by the user.
- * Mongoose calls the event handler, passing the events defined below.
- */
-typedef void (*mg_event_handler_t)(struct mg_connection *nc, int ev,
-                                   void *ev_data MG_UD_ARG(void *user_data));
-
-/* Events. Meaning of event parameter (evp) is given in the comment. */
-#define MG_EV_POLL 0    /* Sent to each connection on each mg_mgr_poll() call */
-#define MG_EV_ACCEPT 1  /* New connection accepted. union socket_address * */
-#define MG_EV_CONNECT 2 /* connect() succeeded or failed. int *  */
-#define MG_EV_RECV 3    /* Data has been received. int *num_bytes */
-#define MG_EV_SEND 4    /* Data has been written to a socket. int *num_bytes */
-#define MG_EV_CLOSE 5   /* Connection is closed. NULL */
-#define MG_EV_TIMER 6   /* now >= conn->ev_timer_time. double * */
-
-/*
- * Mongoose event manager.
- */
-struct mg_mgr {
-  struct mg_connection *active_connections;
-#if MG_ENABLE_HEXDUMP
-  const char *hexdump_file; /* Debug hexdump file path */
-#endif
-#if MG_ENABLE_BROADCAST
-  sock_t ctl[2]; /* Socketpair for mg_broadcast() */
-#endif
-  void *user_data; /* User data */
-  int num_ifaces;
-  int num_calls;
-  struct mg_iface **ifaces; /* network interfaces */
-  const char *nameserver;   /* DNS server to use */
-};
 
-/*
- * Mongoose connection.
- */
-struct mg_connection {
-  struct mg_connection *next, *prev; /* mg_mgr::active_connections linkage */
-  struct mg_connection *listener;    /* Set only for accept()-ed connections */
-  struct mg_mgr *mgr;                /* Pointer to containing manager */
-
-  sock_t sock; /* Socket to the remote peer */
-  int err;
-  union socket_address sa; /* Remote peer address */
-  size_t recv_mbuf_limit;  /* Max size of recv buffer */
-  struct mbuf recv_mbuf;   /* Received data */
-  struct mbuf send_mbuf;   /* Data scheduled for sending */
-  time_t last_io_time;     /* Timestamp of the last socket IO */
-  double ev_timer_time;    /* Timestamp of the future MG_EV_TIMER */
-  mg_event_handler_t proto_handler; /* Protocol-specific event handler */
-  void *proto_data;                 /* Protocol-specific data */
-  void (*proto_data_destructor)(void *proto_data);
-  mg_event_handler_t handler; /* Event handler function */
-  void *user_data;            /* User-specific data */
-  union {
-    void *v;
-    /*
-     * the C standard is fussy about fitting function pointers into
-     * void pointers, since some archs might have fat pointers for functions.
-     */
-    mg_event_handler_t f;
-  } priv_1;
-  void *priv_2;
-  void *mgr_data; /* Implementation-specific event manager's data. */
-  struct mg_iface *iface;
-  unsigned long flags;
-/* Flags set by Mongoose */
-#define MG_F_LISTENING (1 << 0)          /* This connection is listening */
-#define MG_F_UDP (1 << 1)                /* This connection is UDP */
-#define MG_F_RESOLVING (1 << 2)          /* Waiting for async resolver */
-#define MG_F_CONNECTING (1 << 3)         /* connect() call in progress */
-#define MG_F_SSL (1 << 4)                /* SSL is enabled on the connection */
-#define MG_F_SSL_HANDSHAKE_DONE (1 << 5) /* SSL hanshake has completed */
-#define MG_F_WANT_READ (1 << 6)          /* SSL specific */
-#define MG_F_WANT_WRITE (1 << 7)         /* SSL specific */
-#define MG_F_IS_WEBSOCKET (1 << 8)       /* Websocket specific */
-#define MG_F_RECV_AND_CLOSE (1 << 9) /* Drain rx and close the connection. */
-
-/* Flags that are settable by user */
-#define MG_F_SEND_AND_CLOSE (1 << 10)      /* Push remaining data and close  */
-#define MG_F_CLOSE_IMMEDIATELY (1 << 11)   /* Disconnect */
-
-/* Flags for protocol handlers */
-#define MG_F_PROTO_1 (1 << 12)
-#define MG_F_PROTO_2 (1 << 13)
-#define MG_F_ENABLE_BROADCAST (1 << 14)    /* Allow broadcast address usage */
-
-/* Flags left for application */
-#define MG_F_USER_1 (1 << 20)
-#define MG_F_USER_2 (1 << 21)
-#define MG_F_USER_3 (1 << 22)
-#define MG_F_USER_4 (1 << 23)
-#define MG_F_USER_5 (1 << 24)
-#define MG_F_USER_6 (1 << 25)
-
-#if MG_ENABLE_SSL
-  void *ssl_if_data; /* SSL library data. */
+#if MG_ENABLE_LOG
+#define LOG(level, args)                                                   \
+  do {                                                                     \
+    if (mg_log_prefix((level), __FILE__, __LINE__, __func__)) mg_log args; \
+  } while (0)
+enum { LL_NONE, LL_ERROR, LL_INFO, LL_DEBUG, LL_VERBOSE_DEBUG };
+bool mg_log_prefix(int ll, const char *file, int line, const char *fname);
+void mg_log(const char *fmt, ...) PRINTF_LIKE(1, 2);
+void mg_log_set(const char *spec);
+void mg_log_set_callback(void (*fn)(const void *, size_t, void *), void *param);
 #else
-  void *unused_ssl_if_data; /* To keep the size of the structure the same. */
+#define LOG(level, args) (void) 0
+#define mg_log_set(x) (void) (x)
 #endif
-};
 
-/*
- * Initialise Mongoose manager. Side effect: ignores SIGPIPE signal.
- * `mgr->user_data` field will be initialised with a `user_data` parameter.
- * That is an arbitrary pointer, where the user code can associate some data
- * with the particular Mongoose manager. For example, a C++ wrapper class
- * could be written in which case `user_data` can hold a pointer to the
- * class instance.
- */
-void mg_mgr_init(struct mg_mgr *mgr, void *user_data);
-
-/*
- * Optional parameters to `mg_mgr_init_opt()`.
- *
- * If `main_iface` is not NULL, it will be used as the main interface in the
- * default interface set. The pointer will be free'd by `mg_mgr_free`.
- * Otherwise, the main interface will be autodetected based on the current
- * platform.
- *
- * If `num_ifaces` is 0 and `ifaces` is NULL, the default interface set will be
- * used.
- * This is an advanced option, as it requires you to construct a full interface
- * set, including special networking interfaces required by some optional
- * features such as TCP tunneling. Memory backing `ifaces` and each of the
- * `num_ifaces` pointers it contains will be reclaimed by `mg_mgr_free`.
- */
-struct mg_mgr_init_opts {
-  const struct mg_iface_vtable *main_iface;
-  int num_ifaces;
-  const struct mg_iface_vtable **ifaces;
-  const char *nameserver;
-};
-
-/*
- * Like `mg_mgr_init` but with more options.
- *
- * Notably, this allows you to create a manger and choose
- * dynamically which networking interface implementation to use.
- */
-void mg_mgr_init_opt(struct mg_mgr *mgr, void *user_data,
-                     struct mg_mgr_init_opts opts);
-
-/*
- * De-initialises Mongoose manager.
- *
- * Closes and deallocates all active connections.
- */
-void mg_mgr_free(struct mg_mgr *mgr);
-
-/*
- * This function performs the actual IO and must be called in a loop
- * (an event loop). It returns number of user events generated (except POLLs).
- * `milli` is the maximum number of milliseconds to sleep.
- * `mg_mgr_poll()` checks all connections for IO readiness. If at least one
- * of the connections is IO-ready, `mg_mgr_poll()` triggers the respective
- * event handlers and returns.
- */
-int mg_mgr_poll(struct mg_mgr *mgr, int milli);
-
-#if MG_ENABLE_BROADCAST
-/*
- * Passes a message of a given length to all connections.
- *
- * Must be called from a thread that does NOT call `mg_mgr_poll()`.
- * Note that `mg_broadcast()` is the only function
- * that can be, and must be, called from a different (non-IO) thread.
- *
- * `func` callback function will be called by the IO thread for each
- * connection. When called, the event will be `MG_EV_POLL`, and a message will
- * be passed as the `ev_data` pointer. Maximum message size is capped
- * by `MG_CTL_MSG_MESSAGE_SIZE` which is set to 8192 bytes by default.
- */
-void mg_broadcast(struct mg_mgr *mgr, mg_event_handler_t cb, void *data,
-                  size_t len);
-#endif
 
-/*
- * Iterates over all active connections.
- *
- * Returns the next connection from the list
- * of active connections or `NULL` if there are no more connections. Below
- * is the iteration idiom:
- *
- * ```c
- * for (c = mg_next(srv, NULL); c != NULL; c = mg_next(srv, c)) {
- *   // Do something with connection `c`
- * }
- * ```
- */
-struct mg_connection *mg_next(struct mg_mgr *mgr, struct mg_connection *c);
-
-/*
- * Optional parameters to `mg_add_sock_opt()`.
- *
- * `flags` is an initial `struct mg_connection::flags` bitmask to set,
- * see `MG_F_*` flags definitions.
- */
-struct mg_add_sock_opts {
-  void *user_data;           /* Initial value for connection's user_data */
-  unsigned int flags;        /* Initial connection flags */
-  const char **error_string; /* Placeholder for the error string */
-  struct mg_iface *iface;    /* Interface instance */
-};
 
-/*
- * Creates a connection, associates it with the given socket and event handler
- * and adds it to the manager.
- *
- * For more options see the `mg_add_sock_opt` variant.
- */
-struct mg_connection *mg_add_sock(struct mg_mgr *mgr, sock_t sock,
-                                  MG_CB(mg_event_handler_t handler,
-                                        void *user_data));
-
-/*
- * Creates a connection, associates it with the given socket and event handler
- * and adds to the manager.
- *
- * See the `mg_add_sock_opts` structure for a description of the options.
- */
-struct mg_connection *mg_add_sock_opt(struct mg_mgr *mgr, sock_t sock,
-                                      MG_CB(mg_event_handler_t handler,
-                                            void *user_data),
-                                      struct mg_add_sock_opts opts);
-
-/*
- * Optional parameters to `mg_bind_opt()`.
- *
- * `flags` is an initial `struct mg_connection::flags` bitmask to set,
- * see `MG_F_*` flags definitions.
- */
-struct mg_bind_opts {
-  void *user_data;           /* Initial value for connection's user_data */
-  unsigned int flags;        /* Extra connection flags */
-  const char **error_string; /* Placeholder for the error string */
-  struct mg_iface *iface;    /* Interface instance */
-#if MG_ENABLE_SSL
-  /*
-   * SSL settings.
-   *
-   * Server certificate to present to clients or client certificate to
-   * present to tunnel dispatcher (for tunneled connections).
-   */
-  const char *ssl_cert;
-  /* Private key corresponding to the certificate. If ssl_cert is set but
-   * ssl_key is not, ssl_cert is used. */
-  const char *ssl_key;
-  /* CA bundle used to verify client certificates or tunnel dispatchers. */
-  const char *ssl_ca_cert;
-  /* Colon-delimited list of acceptable cipher suites.
-   * Names depend on the library used, for example:
-   *
-   * ECDH-ECDSA-AES128-GCM-SHA256:DHE-RSA-AES128-SHA256 (OpenSSL)
-   * TLS-ECDH-ECDSA-WITH-AES-128-GCM-SHA256:TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
-   *   (mbedTLS)
-   *
-   * For OpenSSL the list can be obtained by running "openssl ciphers".
-   * For mbedTLS, names can be found in library/ssl_ciphersuites.c
-   * If NULL, a reasonable default is used.
-   */
-  const char *ssl_cipher_suites;
-#endif
-};
 
-/*
- * Creates a listening connection.
- *
- * See `mg_bind_opt` for full documentation.
- */
-struct mg_connection *mg_bind(struct mg_mgr *mgr, const char *address,
-                              MG_CB(mg_event_handler_t handler,
-                                    void *user_data));
-/*
- * Creates a listening connection.
- *
- * The `address` parameter specifies which address to bind to. It's format is
- * the same as for the `mg_connect()` call, where `HOST` part is optional.
- * `address` can be just a port number, e.g. `:8000`. To bind to a specific
- * interface, an IP address can be specified, e.g. `1.2.3.4:8000`. By default,
- * a TCP connection is created. To create UDP connection, prepend `udp://`
- * prefix, e.g. `udp://:8000`. To summarize, `address` parameter has following
- * format: `[PROTO://][IP_ADDRESS]:PORT`, where `PROTO` could be `tcp` or
- * `udp`.
- *
- * See the `mg_bind_opts` structure for a description of the optional
- * parameters.
- *
- * Returns a new listening connection or `NULL` on error.
- * NOTE: The connection remains owned by the manager, do not free().
- */
-struct mg_connection *mg_bind_opt(struct mg_mgr *mgr, const char *address,
-                                  MG_CB(mg_event_handler_t handler,
-                                        void *user_data),
-                                  struct mg_bind_opts opts);
-
-/* Optional parameters to `mg_connect_opt()` */
-struct mg_connect_opts {
-  void *user_data;           /* Initial value for connection's user_data */
-  unsigned int flags;        /* Extra connection flags */
-  const char **error_string; /* Placeholder for the error string */
-  struct mg_iface *iface;    /* Interface instance */
-  const char *nameserver;    /* DNS server to use, NULL for default */
-#if MG_ENABLE_SSL
-  /*
-   * SSL settings.
-   * Client certificate to present to the server.
-   */
-  const char *ssl_cert;
-  /*
-   * Private key corresponding to the certificate.
-   * If ssl_cert is set but ssl_key is not, ssl_cert is used.
-   */
-  const char *ssl_key;
-  /*
-   * Verify server certificate using this CA bundle. If set to "*", then SSL
-   * is enabled but no cert verification is performed.
-   */
-  const char *ssl_ca_cert;
-  /* Colon-delimited list of acceptable cipher suites.
-   * Names depend on the library used, for example:
-   *
-   * ECDH-ECDSA-AES128-GCM-SHA256:DHE-RSA-AES128-SHA256 (OpenSSL)
-   * TLS-ECDH-ECDSA-WITH-AES-128-GCM-SHA256:TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
-   *   (mbedTLS)
-   *
-   * For OpenSSL the list can be obtained by running "openssl ciphers".
-   * For mbedTLS, names can be found in library/ssl_ciphersuites.c
-   * If NULL, a reasonable default is used.
-   */
-  const char *ssl_cipher_suites;
-  /*
-   * Server name verification. If ssl_ca_cert is set and the certificate has
-   * passed verification, its subject will be verified against this string.
-   * By default (if ssl_server_name is NULL) hostname part of the address will
-   * be used. Wildcard matching is supported. A special value of "*" disables
-   * name verification.
-   */
-  const char *ssl_server_name;
-  /*
-   * PSK identity and key. Identity is a NUL-terminated string and key is a hex
-   * string. Key must be either 16 or 32 bytes (32 or 64 hex digits) for AES-128
-   * or AES-256 respectively.
-   * Note: Default list of cipher suites does not include PSK suites, if you
-   * want to use PSK you will need to set ssl_cipher_suites as well.
-   */
-  const char *ssl_psk_identity;
-  const char *ssl_psk_key;
-#endif
+struct mg_timer {
+  int64_t period_ms;        // Timer period in milliseconds
+  int64_t expire;           // Expiration timestamp in milliseconds
+  unsigned flags;           // Possible flags values below
+#define MG_TIMER_REPEAT 1   // Call function periodically, otherwise run once
+#define MG_TIMER_RUN_NOW 2  // Call immediately when timer is set
+  void (*fn)(void *);       // Function to call
+  void *arg;                // Function argument
+  struct mg_timer *next;    // Linkage in g_timers list
 };
 
-/*
- * Connects to a remote host.
- *
- * See `mg_connect_opt()` for full documentation.
- */
-struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *address,
-                                 MG_CB(mg_event_handler_t handler,
-                                       void *user_data));
-
-/*
- * Connects to a remote host.
- *
- * The `address` format is `[PROTO://]HOST:PORT`. `PROTO` could be `tcp` or
- * `udp`. `HOST` could be an IP address,
- * IPv6 address (if Mongoose is compiled with `-DMG_ENABLE_IPV6`) or a host
- * name. If `HOST` is a name, Mongoose will resolve it asynchronously. Examples
- * of valid addresses: `google.com:80`, `udp://1.2.3.4:53`, `10.0.0.1:443`,
- * `[::1]:80`
- *
- * See the `mg_connect_opts` structure for a description of the optional
- * parameters.
- *
- * Returns a new outbound connection or `NULL` on error.
- *
- * NOTE: The connection remains owned by the manager, do not free().
- *
- * NOTE: To enable IPv6 addresses `-DMG_ENABLE_IPV6` should be specified
- * in the compilation flags.
- *
- * NOTE: The new connection will receive `MG_EV_CONNECT` as its first event
- * which will report the connect success status.
- * If the asynchronous resolution fails or the `connect()` syscall fails for
- * whatever reason (e.g. with `ECONNREFUSED` or `ENETUNREACH`), then
- * `MG_EV_CONNECT` event will report failure. Code example below:
- *
- * ```c
- * static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
- *   int connect_status;
- *
- *   switch (ev) {
- *     case MG_EV_CONNECT:
- *       connect_status = * (int *) ev_data;
- *       if (connect_status == 0) {
- *         // Success
- *       } else  {
- *         // Error
- *         printf("connect() error: %s\n", strerror(connect_status));
- *       }
- *       break;
- *     ...
- *   }
- * }
- *
- *   ...
- *   mg_connect(mgr, "my_site.com:80", ev_handler);
- * ```
- */
-struct mg_connection *mg_connect_opt(struct mg_mgr *mgr, const char *address,
-                                     MG_CB(mg_event_handler_t handler,
-                                           void *user_data),
-                                     struct mg_connect_opts opts);
-
-#if MG_ENABLE_SSL && MG_NET_IF != MG_NET_IF_SIMPLELINK
-/*
- * Note: This function is deprecated. Please, use SSL options in
- * mg_connect_opt.
- *
- * Enables SSL for a given connection.
- * `cert` is a server certificate file name for a listening connection
- * or a client certificate file name for an outgoing connection.
- * The certificate files must be in PEM format. The server certificate file
- * must contain a certificate, concatenated with a private key, optionally
- * concatenated with DH parameters.
- * `ca_cert` is a CA certificate or NULL if peer verification is not
- * required.
- * Return: NULL on success or error message on error.
- */
-const char *mg_set_ssl(struct mg_connection *nc, const char *cert,
-                       const char *ca_cert);
-#endif
+extern struct mg_timer *g_timers;  // Global list of timers
 
-/*
- * Sends data to the connection.
- *
- * Note that sending functions do not actually push data to the socket.
- * They just append data to the output buffer. MG_EV_SEND will be delivered when
- * the data has actually been pushed out.
- */
-void mg_send(struct mg_connection *, const void *buf, int len);
+void mg_timer_init(struct mg_timer *, int64_t, unsigned, void (*)(void *),
+                   void *);
+void mg_timer_free(struct mg_timer *);
+void mg_timer_poll(int64_t current_time_ms);
 
-/* Enables format string warnings for mg_printf */
-#if defined(__GNUC__)
-__attribute__((format(printf, 2, 3)))
-#endif
-/* don't separate from mg_printf declaration */
 
-/*
- * Sends `printf`-style formatted data to the connection.
- *
- * See `mg_send` for more details on send semantics.
- */
-int mg_printf(struct mg_connection *, const char *fmt, ...);
 
-/* Same as `mg_printf()`, but takes `va_list ap` as an argument. */
-int mg_vprintf(struct mg_connection *, const char *fmt, va_list ap);
 
-/*
- * Creates a socket pair.
- * `sock_type` can be either `SOCK_STREAM` or `SOCK_DGRAM`.
- * Returns 0 on failure and 1 on success.
- */
-int mg_socketpair(sock_t[2], int sock_type);
-
-#if MG_ENABLE_SYNC_RESOLVER
-/*
- * Convert domain name into IP address.
- *
- * This is a utility function. If compilation flags have
- * `-DMG_ENABLE_GETADDRINFO`, then `getaddrinfo()` call is used for name
- * resolution. Otherwise, `gethostbyname()` is used.
- *
- * CAUTION: this function can block.
- * Return 1 on success, 0 on failure.
- */
-int mg_resolve(const char *domain_name, char *ip_addr_buf, size_t buf_len);
-#endif
 
-/*
- * Verify given IP address against the ACL.
- *
- * `remote_ip` - an IPv4 address to check, in host byte order
- * `acl` - a comma separated list of IP subnets: `x.x.x.x/x` or `x.x.x.x`.
- * Each subnet is
- * prepended by either a - or a + sign. A plus sign means allow, where a
- * minus sign means deny. If a subnet mask is omitted, such as `-1.2.3.4`,
- * it means that only that single IP address is denied.
- * Subnet masks may vary from 0 to 32, inclusive. The default setting
- * is to allow all access. On each request the full list is traversed,
- * and the last match wins. Example:
- *
- * `-0.0.0.0/0,+192.168/16` - deny all accesses, only allow 192.168/16 subnet
- *
- * To learn more about subnet masks, see this
- * link:https://en.wikipedia.org/wiki/Subnetwork[Wikipedia page on Subnetwork].
- *
- * Returns -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed.
- */
-int mg_check_ip_acl(const char *acl, uint32_t remote_ip);
-
-/*
- * Schedules an MG_EV_TIMER event to be delivered at `timestamp` time.
- * `timestamp` is UNIX time (the number of seconds since Epoch). It is
- * `double` instead of `time_t` to allow for sub-second precision.
- * Returns the old timer value.
- *
- * Example: set the connect timeout to 1.5 seconds:
- *
- * ```
- *  c = mg_connect(&mgr, "cesanta.com", ev_handler);
- *  mg_set_timer(c, mg_time() + 1.5);
- *  ...
- *
- *  void ev_handler(struct mg_connection *c, int ev, void *ev_data) {
- *  switch (ev) {
- *    case MG_EV_CONNECT:
- *      mg_set_timer(c, 0);  // Clear connect timer
- *      break;
- *    case MG_EV_TIMER:
- *      log("Connect timeout");
- *      c->flags |= MG_F_CLOSE_IMMEDIATELY;
- *      break;
- * ```
- */
-double mg_set_timer(struct mg_connection *c, double timestamp);
-
-/*
- * A sub-second precision version of time().
- */
-double mg_time(void);
+enum { MG_FS_READ = 1, MG_FS_WRITE = 2, MG_FS_DIR = 4 };
 
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
+// Filesystem API functions
+// stat() returns MG_FS_* flags and populates file size and modification time
+// list() calls fn() for every directory entry, allowing to list a directory
+struct mg_fs {
+  int (*stat)(const char *path, size_t *size, time_t *mtime);
+  void (*list)(const char *path, void (*fn)(const char *, void *), void *);
+  void *(*open)(const char *path, int flags);              // Open file
+  void (*close)(void *fd);                                 // Close file
+  size_t (*read)(void *fd, void *buf, size_t len);         // Read file
+  size_t (*write)(void *fd, const void *buf, size_t len);  // Write file
+  size_t (*seek)(void *fd, size_t offset);                 // Set file position
+  bool (*rename)(const char *from, const char *to);        // Rename
+  bool (*remove)(const char *path);                        // Delete file
+  bool (*mkd)(const char *path);                           // Create directory
+};
 
-#endif /* CS_MONGOOSE_SRC_NET_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_uri.h"
-#endif
+extern struct mg_fs mg_fs_posix;   // POSIX open/close/read/write/seek
+extern struct mg_fs mg_fs_packed;  // Packed FS, see examples/complete
+extern struct mg_fs mg_fs_fat;     // FAT FS
 
-/*
- * === URI
- */
+// File descriptor
+struct mg_fd {
+  void *fd;
+  struct mg_fs *fs;
+};
 
-#ifndef CS_MONGOOSE_SRC_URI_H_
-#define CS_MONGOOSE_SRC_URI_H_
+struct mg_fd *mg_fs_open(struct mg_fs *fs, const char *path, int flags);
+void mg_fs_close(struct mg_fd *fd);
+char *mg_file_read(struct mg_fs *fs, const char *path, size_t *size);
+bool mg_file_write(struct mg_fs *fs, const char *path, const void *, size_t);
+bool mg_file_printf(struct mg_fs *fs, const char *path, const char *fmt, ...);
 
-/* Amalgamated: #include "mg_net.h" */
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/*
- * Parses an URI and fills string chunks with locations of the respective
- * uri components within the input uri string. NULL pointers will be
- * ignored.
- *
- * General syntax:
- *
- *     [scheme://[user_info@]]host[:port][/path][?query][#fragment]
- *
- * Example:
- *
- *     foo.com:80
- *     tcp://foo.com:1234
- *     http://foo.com:80/bar?baz=1
- *     https://user:pw@foo.com:443/blah
- *
- * `path` will include the leading slash. `query` won't include the leading `?`.
- * `host` can contain embedded colons if surrounded by square brackets in order
- * to support IPv6 literal addresses.
- *
- *
- * Returns 0 on success, -1 on error.
- */
-int mg_parse_uri(const struct mg_str uri, struct mg_str *scheme,
-                 struct mg_str *user_info, struct mg_str *host,
-                 unsigned int *port, struct mg_str *path, struct mg_str *query,
-                 struct mg_str *fragment);
-
-/*
- * Assemble URI from parts. Any of the inputs can be NULL or zero-length mg_str.
- *
- * If normalize_path is true, path is normalized by resolving relative refs.
- *
- * Result is a heap-allocated string (uri->p must be free()d after use).
- *
- * Returns 0 on success, -1 on error.
- */
-int mg_assemble_uri(const struct mg_str *scheme, const struct mg_str *user_info,
-                    const struct mg_str *host, unsigned int port,
-                    const struct mg_str *path, const struct mg_str *query,
-                    const struct mg_str *fragment, int normalize_path,
-                    struct mg_str *uri);
-
-int mg_normalize_uri_path(const struct mg_str *in, struct mg_str *out);
 
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* CS_MONGOOSE_SRC_URI_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_util.h"
-#endif
 
-/*
- * === Utility API
- */
 
-#ifndef CS_MONGOOSE_SRC_UTIL_H_
-#define CS_MONGOOSE_SRC_UTIL_H_
 
-#include <stdio.h>
+void mg_random(void *buf, size_t len);
+bool mg_globmatch(const char *pattern, size_t plen, const char *s, size_t n);
+bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v);
+uint16_t mg_ntohs(uint16_t net);
+uint32_t mg_ntohl(uint32_t net);
+uint32_t mg_crc32(uint32_t crc, const char *buf, size_t len);
+char *mg_hexdump(const void *buf, size_t len);
+char *mg_hex(const void *buf, size_t len, char *dst);
+void mg_unhex(const char *buf, size_t len, unsigned char *to);
+unsigned long mg_unhexn(const char *s, size_t len);
+int mg_asprintf(char **buf, size_t size, const char *fmt, ...);
+int mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
+int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
+int64_t mg_to64(struct mg_str str);
+int64_t mg_millis(void);
 
-/* Amalgamated: #include "mg_common.h" */
-/* Amalgamated: #include "mg_net_if.h" */
+#define mg_htons(x) mg_ntohs(x)
+#define mg_htonl(x) mg_ntohl(x)
 
+#ifndef EXTERN_C
 #ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-#ifndef MG_MAX_PATH
-#ifdef PATH_MAX
-#define MG_MAX_PATH PATH_MAX
+#define EXTERN_C extern "C"
 #else
-#define MG_MAX_PATH 256
-#endif
+#define EXTERN_C
 #endif
-
-/*
- * Fetches substring from input string `s`, `end` into `v`.
- * Skips initial delimiter characters. Records first non-delimiter character
- * at the beginning of substring `v`. Then scans the rest of the string
- * until a delimiter character or end-of-string is found.
- * `delimiters` is a 0-terminated string containing delimiter characters.
- * Either one of `delimiters` or `end_string` terminates the search.
- * Returns an `s` pointer, advanced forward where parsing has stopped.
- */
-const char *mg_skip(const char *s, const char *end_string,
-                    const char *delimiters, struct mg_str *v);
-
-/*
- * Decodes base64-encoded string `s`, `len` into the destination `dst`.
- * The destination has to have enough space to hold the decoded buffer.
- * Decoding stops either when all strings have been decoded or invalid an
- * character appeared.
- * Destination is '\0'-terminated.
- * Returns the number of decoded characters. On success, that should be equal
- * to `len`. On error (invalid character) the return value is smaller then
- * `len`.
- */
-int mg_base64_decode(const unsigned char *s, int len, char *dst);
-
-/*
- * Base64-encode chunk of memory `src`, `src_len` into the destination `dst`.
- * Destination has to have enough space to hold encoded buffer.
- * Destination is '\0'-terminated.
- */
-void mg_base64_encode(const unsigned char *src, int src_len, char *dst);
-
-#if MG_ENABLE_FILESYSTEM
-/*
- * Performs a 64-bit `stat()` call against a given file.
- *
- * `path` should be UTF8 encoded.
- *
- * Return value is the same as for `stat()` syscall.
- */
-int mg_stat(const char *path, cs_stat_t *st);
-
-/*
- * Opens the given file and returns a file stream.
- *
- * `path` and `mode` should be UTF8 encoded.
- *
- * Return value is the same as for the `fopen()` call.
- */
-FILE *mg_fopen(const char *path, const char *mode);
-
-/*
- * Opens the given file and returns a file stream.
- *
- * `path` should be UTF8 encoded.
- *
- * Return value is the same as for the `open()` syscall.
- */
-int mg_open(const char *path, int flag, int mode);
-
-/*
- * Reads data from the given file stream.
- *
- * Return value is a number of bytes readen.
- */
-size_t mg_fread(void *ptr, size_t size, size_t count, FILE *f);
-
-/*
- * Writes data to the given file stream.
- *
- * Return value is a number of bytes wtitten.
- */
-size_t mg_fwrite(const void *ptr, size_t size, size_t count, FILE *f);
-
-#endif /* MG_ENABLE_FILESYSTEM */
-
-#if MG_ENABLE_THREADS
-/*
- * Starts a new detached thread.
- * Arguments and semantics are the same as pthead's `pthread_create()`.
- * `thread_func` is a thread function, `thread_func_param` is a parameter
- * that is passed to the thread function.
- */
-void *mg_start_thread(void *(*thread_func)(void *), void *thread_func_param);
-#endif
-
-void mg_set_close_on_exec(sock_t);
-
-#define MG_SOCK_STRINGIFY_IP 1
-#define MG_SOCK_STRINGIFY_PORT 2
-#define MG_SOCK_STRINGIFY_REMOTE 4
-/*
- * Converts a connection's local or remote address into string.
- *
- * The `flags` parameter is a bit mask that controls the behaviour,
- * see `MG_SOCK_STRINGIFY_*` definitions.
- *
- * - MG_SOCK_STRINGIFY_IP - print IP address
- * - MG_SOCK_STRINGIFY_PORT - print port number
- * - MG_SOCK_STRINGIFY_REMOTE - print remote peer's IP/port, not local address
- *
- * If both port number and IP address are printed, they are separated by `:`.
- * If compiled with `-DMG_ENABLE_IPV6`, IPv6 addresses are supported.
- * Return length of the stringified address.
- */
-int mg_conn_addr_to_str(struct mg_connection *c, char *buf, size_t len,
-                        int flags);
-#if MG_NET_IF == MG_NET_IF_SOCKET
-/* Legacy interface. */
-void mg_sock_to_str(sock_t sock, char *buf, size_t len, int flags);
-#endif
-
-/*
- * Convert the socket's address into string.
- *
- * `flags` is MG_SOCK_STRINGIFY_IP and/or MG_SOCK_STRINGIFY_PORT.
- */
-int mg_sock_addr_to_str(const union socket_address *sa, char *buf, size_t len,
-                        int flags);
-
-#if MG_ENABLE_HEXDUMP
-/*
- * Generates a human-readable hexdump of memory chunk.
- *
- * Takes a memory buffer `buf` of length `len` and creates a hex dump of that
- * buffer in `dst`. The generated output is a-la hexdump(1).
- * Returns the length of generated string, excluding terminating `\0`. If
- * returned length is bigger than `dst_len`, the overflow bytes are discarded.
- */
-int mg_hexdump(const void *buf, int len, char *dst, int dst_len);
-
-/* Same as mg_hexdump, but with output going to file instead of a buffer. */
-void mg_hexdumpf(FILE *fp, const void *buf, int len);
-
-/*
- * Generates human-readable hexdump of the data sent or received by the
- * connection. `path` is a file name where hexdump should be written.
- * `num_bytes` is a number of bytes sent/received. `ev` is one of the `MG_*`
- * events sent to an event handler. This function is supposed to be called from
- * the event handler.
- */
-void mg_hexdump_connection(struct mg_connection *nc, const char *path,
-                           const void *buf, int num_bytes, int ev);
-#endif
-
-/*
- * Returns true if target platform is big endian.
- */
-int mg_is_big_endian(void);
-
-/*
- * Use with cs_base64_init/update/finish in order to write out base64 in chunks.
- */
-void mg_mbuf_append_base64_putc(char ch, void *user_data);
-
-/*
- * Encode `len` bytes starting at `data` as base64 and append them to an mbuf.
- */
-void mg_mbuf_append_base64(struct mbuf *mbuf, const void *data, size_t len);
-
-/*
- * Generate a Basic Auth header and appends it to buf.
- * If pass is NULL, then user is expected to contain the credentials pair
- * already encoded as `user:pass`.
- */
-void mg_basic_auth_header(const struct mg_str user, const struct mg_str pass,
-                          struct mbuf *buf);
-
-/*
- * URL-escape the specified string.
- * All characters acept letters, numbers and characters listed in
- * `safe` are escaped. If `hex_upper`is true, `A-F` are used for hex digits.
- * Input need not be NUL-terminated, but the returned string is.
- * Returned string is heap-allocated and must be free()'d.
- */
-#define MG_URL_ENCODE_F_SPACE_AS_PLUS (1 << 0)
-#define MG_URL_ENCODE_F_UPPERCASE_HEX (1 << 1)
-struct mg_str mg_url_encode_opt(const struct mg_str src,
-                                const struct mg_str safe, unsigned int flags);
-
-/* Same as `mg_url_encode_opt(src, "._-$,;~()/", 0)`. */
-struct mg_str mg_url_encode(const struct mg_str src);
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* CS_MONGOOSE_SRC_UTIL_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_http.h"
 #endif
 
-/*
- * === Common API reference
- */
-
-#ifndef CS_MONGOOSE_SRC_HTTP_H_
-#define CS_MONGOOSE_SRC_HTTP_H_
-
-#if MG_ENABLE_HTTP
-
-/* Amalgamated: #include "common/mg_str.h" */
-/* Amalgamated: #include "mg_net.h" */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
+// Expands to a string representation of its argument: e.g.
+// MG_STRINGIFY_LITERAL(5) expands to "5"
+#if !defined(_MSC_VER) || _MSC_VER >= 1900
+#define MG_STRINGIFY_LITERAL(...) #__VA_ARGS__
+#else
+#define MG_STRINGIFY_LITERAL(x) #x
+#endif
+// Expands to a string representation of its argument, which can be a macro:
+// #define FOO 123
+// MG_STRINGIFY_MACRO(FOO)  // Expands to 123
+#define MG_STRINGIFY_MACRO(x) MG_STRINGIFY_LITERAL(x)
+
+// Linked list management macros
+#define LIST_ADD_HEAD(type_, head_, elem_) \
+  do {                                     \
+    (elem_)->next = (*head_);              \
+    *(head_) = (elem_);                    \
+  } while (0)
 
-#ifndef MG_MAX_HTTP_HEADERS
-#define MG_MAX_HTTP_HEADERS 20
-#endif
+#define LIST_ADD_TAIL(type_, head_, elem_) \
+  do {                                     \
+    type_ **h = head_;                     \
+    while (*h != NULL) h = &(*h)->next;    \
+    *h = (elem_);                          \
+  } while (0)
 
-#ifndef MG_MAX_HTTP_REQUEST_SIZE
-#define MG_MAX_HTTP_REQUEST_SIZE 1024
-#endif
+#define LIST_DELETE(type_, head_, elem_)   \
+  do {                                     \
+    type_ **h = head_;                     \
+    while (*h != (elem_)) h = &(*h)->next; \
+    *h = (elem_)->next;                    \
+  } while (0)
 
-#ifndef MG_MAX_HTTP_SEND_MBUF
-#define MG_MAX_HTTP_SEND_MBUF 1024
-#endif
 
-#ifndef MG_CGI_ENVIRONMENT_SIZE
-#define MG_CGI_ENVIRONMENT_SIZE 8192
-#endif
 
-/* HTTP message */
-struct http_message {
-  struct mg_str message; /* Whole message: request line + headers + body */
-  struct mg_str body;    /* Message body. 0-length for requests with no body */
-
-  /* HTTP Request line (or HTTP response line) */
-  struct mg_str method; /* "GET" */
-  struct mg_str uri;    /* "/my_file.html" */
-  struct mg_str proto;  /* "HTTP/1.1" -- for both request and response */
-
-  /* For responses, code and response status message are set */
-  int resp_code;
-  struct mg_str resp_status_msg;
-
-  /*
-   * Query-string part of the URI. For example, for HTTP request
-   *    GET /foo/bar?param1=val1&param2=val2
-   *    |    uri    |     query_string     |
-   *
-   * Note that question mark character doesn't belong neither to the uri,
-   * nor to the query_string
-   */
-  struct mg_str query_string;
-
-  /* Headers */
-  struct mg_str header_names[MG_MAX_HTTP_HEADERS];
-  struct mg_str header_values[MG_MAX_HTTP_HEADERS];
-};
+unsigned short mg_url_port(const char *url);
+int mg_url_is_ssl(const char *url);
+struct mg_str mg_url_host(const char *url);
+struct mg_str mg_url_user(const char *url);
+struct mg_str mg_url_pass(const char *url);
+const char *mg_url_uri(const char *url);
 
-#if MG_ENABLE_HTTP_WEBSOCKET
-/* WebSocket message */
-struct websocket_message {
-  unsigned char *data;
-  size_t size;
-  unsigned char flags;
-};
-#endif
 
-/* HTTP multipart part */
-struct mg_http_multipart_part {
-  const char *file_name;
-  const char *var_name;
-  struct mg_str data;
-  int status; /* <0 on error */
-  void *user_data;
-  /*
-   * User handler can indicate how much of the data was consumed
-   * by setting this variable. By default, it is assumed that all
-   * data has been consumed by the handler.
-   * If not all data was consumed, user's handler will be invoked again later
-   * with the remainder.
-   */
-  size_t num_data_consumed;
-};
+#include <stddef.h>
 
-/* SSI call context */
-struct mg_ssi_call_ctx {
-  struct http_message *req; /* The request being processed. */
-  struct mg_str file;       /* Filesystem path of the file being processed. */
-  struct mg_str arg; /* The argument passed to the tag: <!-- call arg -->. */
+struct mg_iobuf {
+  unsigned char *buf;  // Pointer to stored data
+  size_t size;         // Total size available
+  size_t len;          // Current number of bytes
 };
 
-/* HTTP and websocket events. void *ev_data is described in a comment. */
-#define MG_EV_HTTP_REQUEST 100 /* struct http_message * */
-#define MG_EV_HTTP_REPLY 101   /* struct http_message * */
-#define MG_EV_HTTP_CHUNK 102   /* struct http_message * */
-#define MG_EV_SSI_CALL 105     /* char * */
-#define MG_EV_SSI_CALL_CTX 106 /* struct mg_ssi_call_ctx * */
-
-#if MG_ENABLE_HTTP_WEBSOCKET
-#define MG_EV_WEBSOCKET_HANDSHAKE_REQUEST 111 /* struct http_message * */
-#define MG_EV_WEBSOCKET_HANDSHAKE_DONE 112    /* struct http_message * */
-#define MG_EV_WEBSOCKET_FRAME 113             /* struct websocket_message * */
-#define MG_EV_WEBSOCKET_CONTROL_FRAME 114     /* struct websocket_message * */
-#endif
-
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-#define MG_EV_HTTP_MULTIPART_REQUEST 121 /* struct http_message */
-#define MG_EV_HTTP_PART_BEGIN 122        /* struct mg_http_multipart_part */
-#define MG_EV_HTTP_PART_DATA 123         /* struct mg_http_multipart_part */
-#define MG_EV_HTTP_PART_END 124          /* struct mg_http_multipart_part */
-/* struct mg_http_multipart_part */
-#define MG_EV_HTTP_MULTIPART_REQUEST_END 125
-#endif
-
-#define MG_F_WEBSOCKET_NO_DEFRAG MG_F_PROTO_1
-#define MG_F_DELETE_CHUNK MG_F_PROTO_2
-
-/*
- * Attaches a built-in HTTP event handler to the given connection.
- * The user-defined event handler will receive following extra events:
- *
- * - MG_EV_HTTP_REQUEST: HTTP request has arrived. Parsed HTTP request
- *  is passed as
- *   `struct http_message` through the handler's `void *ev_data` pointer.
- * - MG_EV_HTTP_REPLY: The HTTP reply has arrived. The parsed HTTP reply is
- *   passed as `struct http_message` through the handler's `void *ev_data`
- *   pointer.
- * - MG_EV_HTTP_CHUNK: The HTTP chunked-encoding chunk has arrived.
- *   The parsed HTTP reply is passed as `struct http_message` through the
- *   handler's `void *ev_data` pointer. `http_message::body` would contain
- *   incomplete, reassembled HTTP body.
- *   It will grow with every new chunk that arrives, and it can
- *   potentially consume a lot of memory. An event handler may process
- *   the body as chunks are coming, and signal Mongoose to delete processed
- *   body by setting `MG_F_DELETE_CHUNK` in `mg_connection::flags`. When
- *   the last zero chunk is received,
- *   Mongoose sends `MG_EV_HTTP_REPLY` event with
- *   full reassembled body (if handler did not signal to delete chunks) or
- *   with empty body (if handler did signal to delete chunks).
- * - MG_EV_WEBSOCKET_HANDSHAKE_REQUEST: server has received the WebSocket
- *   handshake request. `ev_data` contains parsed HTTP request.
- * - MG_EV_WEBSOCKET_HANDSHAKE_DONE: server has completed the WebSocket
- *   handshake. `ev_data` is a `struct http_message` containing the
- *   client's request (server mode) or server's response (client).
- *   In client mode handler can examine `resp_code`, which should be 101.
- * - MG_EV_WEBSOCKET_FRAME: new WebSocket frame has arrived. `ev_data` is
- *   `struct websocket_message *`
- *
- * When compiled with MG_ENABLE_HTTP_STREAMING_MULTIPART, Mongoose parses
- * multipart requests and splits them into separate events:
- * - MG_EV_HTTP_MULTIPART_REQUEST: Start of the request.
- *   This event is sent before body is parsed. After this, the user
- *   should expect a sequence of PART_BEGIN/DATA/END requests.
- *   This is also the last time when headers and other request fields are
- *   accessible.
- * - MG_EV_HTTP_PART_BEGIN: Start of a part of a multipart message.
- *   Argument: mg_http_multipart_part with var_name and file_name set
- *   (if present). No data is passed in this message.
- * - MG_EV_HTTP_PART_DATA: new portion of data from the multipart message.
- *   Argument: mg_http_multipart_part. var_name and file_name are preserved,
- *   data is available in mg_http_multipart_part.data.
- * - MG_EV_HTTP_PART_END: End of the current part. var_name, file_name are
- *   the same, no data in the message. If status is 0, then the part is
- *   properly terminated with a boundary, status < 0 means that connection
- *   was terminated.
- * - MG_EV_HTTP_MULTIPART_REQUEST_END: End of the multipart request.
- *   Argument: mg_http_multipart_part, var_name and file_name are NULL,
- *   status = 0 means request was properly closed, < 0 means connection
- *   was terminated (note: in this case both PART_END and REQUEST_END are
- *   delivered).
- */
-void mg_set_protocol_http_websocket(struct mg_connection *nc);
-
-#if MG_ENABLE_HTTP_WEBSOCKET
-/*
- * Send websocket handshake to the server.
- *
- * `nc` must be a valid connection, connected to a server. `uri` is an URI
- * to fetch, extra_headers` is extra HTTP headers to send or `NULL`.
- *
- * This function is intended to be used by websocket client.
- *
- * Note that the Host header is mandatory in HTTP/1.1 and must be
- * included in `extra_headers`. `mg_send_websocket_handshake2` offers
- * a better API for that.
- *
- * Deprecated in favour of `mg_send_websocket_handshake2`
- */
-void mg_send_websocket_handshake(struct mg_connection *nc, const char *uri,
-                                 const char *extra_headers);
-
-/*
- * Send websocket handshake to the server.
- *
- * `nc` must be a valid connection, connected to a server. `uri` is an URI
- * to fetch, `host` goes into the `Host` header, `protocol` goes into the
- * `Sec-WebSocket-Proto` header (NULL to omit), extra_headers` is extra HTTP
- * headers to send or `NULL`.
- *
- * This function is intended to be used by websocket client.
- */
-void mg_send_websocket_handshake2(struct mg_connection *nc, const char *path,
-                                  const char *host, const char *protocol,
-                                  const char *extra_headers);
-
-/* Like mg_send_websocket_handshake2 but also passes basic auth header */
-void mg_send_websocket_handshake3(struct mg_connection *nc, const char *path,
-                                  const char *host, const char *protocol,
-                                  const char *extra_headers, const char *user,
-                                  const char *pass);
-
-/* Same as mg_send_websocket_handshake3 but with strings not necessarily
- * NUL-temrinated */
-void mg_send_websocket_handshake3v(struct mg_connection *nc,
-                                   const struct mg_str path,
-                                   const struct mg_str host,
-                                   const struct mg_str protocol,
-                                   const struct mg_str extra_headers,
-                                   const struct mg_str user,
-                                   const struct mg_str pass);
-
-/*
- * Helper function that creates an outbound WebSocket connection.
- *
- * `url` is a URL to connect to. It must be properly URL-encoded, e.g. have
- * no spaces, etc. By default, `mg_connect_ws()` sends Connection and
- * Host headers. `extra_headers` is an extra HTTP header to send, e.g.
- * `"User-Agent: my-app\r\n"`.
- * If `protocol` is not NULL, then a `Sec-WebSocket-Protocol` header is sent.
- *
- * Examples:
- *
- * ```c
- *   nc1 = mg_connect_ws(mgr, ev_handler_1, "ws://echo.websocket.org", NULL,
- *                       NULL);
- *   nc2 = mg_connect_ws(mgr, ev_handler_1, "wss://echo.websocket.org", NULL,
- *                       NULL);
- *   nc3 = mg_connect_ws(mgr, ev_handler_1, "ws://api.cesanta.com",
- *                       "clubby.cesanta.com", NULL);
- * ```
- */
-struct mg_connection *mg_connect_ws(struct mg_mgr *mgr,
-                                    MG_CB(mg_event_handler_t event_handler,
-                                          void *user_data),
-                                    const char *url, const char *protocol,
-                                    const char *extra_headers);
-
-/*
- * Helper function that creates an outbound WebSocket connection
- *
- * Mostly identical to `mg_connect_ws`, but allows to provide extra parameters
- * (for example, SSL parameters)
- */
-struct mg_connection *mg_connect_ws_opt(
-    struct mg_mgr *mgr, MG_CB(mg_event_handler_t ev_handler, void *user_data),
-    struct mg_connect_opts opts, const char *url, const char *protocol,
-    const char *extra_headers);
-
-/*
- * Send WebSocket frame to the remote end.
- *
- * `op_and_flags` specifies the frame's type. It's one of:
- *
- * - WEBSOCKET_OP_CONTINUE
- * - WEBSOCKET_OP_TEXT
- * - WEBSOCKET_OP_BINARY
- * - WEBSOCKET_OP_CLOSE
- * - WEBSOCKET_OP_PING
- * - WEBSOCKET_OP_PONG
- *
- * Orred with one of the flags:
- *
- * - WEBSOCKET_DONT_FIN: Don't set the FIN flag on the frame to be sent.
- *
- * `data` and `data_len` contain frame data.
- */
-void mg_send_websocket_frame(struct mg_connection *nc, int op_and_flags,
-                             const void *data, size_t data_len);
-
-/*
- * Like `mg_send_websocket_frame()`, but composes a single frame from multiple
- * buffers.
- */
-void mg_send_websocket_framev(struct mg_connection *nc, int op_and_flags,
-                              const struct mg_str *strings, int num_strings);
-
-/*
- * Sends WebSocket frame to the remote end.
- *
- * Like `mg_send_websocket_frame()`, but allows to create formatted messages
- * with `printf()`-like semantics.
- */
-void mg_printf_websocket_frame(struct mg_connection *nc, int op_and_flags,
-                               const char *fmt, ...);
-
-/* Websocket opcodes, from http://tools.ietf.org/html/rfc6455 */
-#define WEBSOCKET_OP_CONTINUE 0
-#define WEBSOCKET_OP_TEXT 1
-#define WEBSOCKET_OP_BINARY 2
-#define WEBSOCKET_OP_CLOSE 8
-#define WEBSOCKET_OP_PING 9
-#define WEBSOCKET_OP_PONG 10
-
-/*
- * If set causes the FIN flag to not be set on outbound
- * frames. This enables sending multiple fragments of a single
- * logical message.
- *
- * The WebSocket protocol mandates that if the FIN flag of a data
- * frame is not set, the next frame must be a WEBSOCKET_OP_CONTINUE.
- * The last frame must have the FIN bit set.
- *
- * Note that mongoose will automatically defragment incoming messages,
- * so this flag is used only on outbound messages.
- */
-#define WEBSOCKET_DONT_FIN 0x100
-
-#endif /* MG_ENABLE_HTTP_WEBSOCKET */
-
-/*
- * Decodes a URL-encoded string.
- *
- * Source string is specified by (`src`, `src_len`), and destination is
- * (`dst`, `dst_len`). If `is_form_url_encoded` is non-zero, then
- * `+` character is decoded as a blank space character. This function
- * guarantees to NUL-terminate the destination. If destination is too small,
- * then the source string is partially decoded and `-1` is returned.
- *Otherwise,
- * a length of the decoded string is returned, not counting final NUL.
- */
-int mg_url_decode(const char *src, int src_len, char *dst, int dst_len,
-                  int is_form_url_encoded);
-
-extern void mg_hash_md5_v(size_t num_msgs, const uint8_t *msgs[],
-                          const size_t *msg_lens, uint8_t *digest);
-extern void mg_hash_sha1_v(size_t num_msgs, const uint8_t *msgs[],
-                           const size_t *msg_lens, uint8_t *digest);
-
-/*
- * Flags for `mg_http_is_authorized()`.
- */
-#define MG_AUTH_FLAG_IS_DIRECTORY (1 << 0)
-#define MG_AUTH_FLAG_IS_GLOBAL_PASS_FILE (1 << 1)
-#define MG_AUTH_FLAG_ALLOW_MISSING_FILE (1 << 2)
-
-/*
- * Checks whether an http request is authorized. `domain` is the authentication
- * realm, `passwords_file` is a htdigest file (can be created e.g. with
- * `htdigest` utility). If either `domain` or `passwords_file` is NULL, this
- * function always returns 1; otherwise checks the authentication in the
- * http request and returns 1 only if there is a match; 0 otherwise.
- */
-int mg_http_is_authorized(struct http_message *hm, struct mg_str path,
-                          const char *domain, const char *passwords_file,
-                          int flags);
-
-/*
- * Sends 401 Unauthorized response.
- */
-void mg_http_send_digest_auth_request(struct mg_connection *c,
-                                      const char *domain);
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
+int mg_iobuf_init(struct mg_iobuf *, size_t);
+int mg_iobuf_resize(struct mg_iobuf *, size_t);
+void mg_iobuf_free(struct mg_iobuf *);
+size_t mg_iobuf_add(struct mg_iobuf *, size_t, const void *, size_t, size_t);
+size_t mg_iobuf_del(struct mg_iobuf *, size_t ofs, size_t len);
 
-#endif /* MG_ENABLE_HTTP */
+int mg_base64_update(unsigned char p, char *to, int len);
+int mg_base64_final(char *to, int len);
+int mg_base64_encode(const unsigned char *p, int n, char *to);
+int mg_base64_decode(const char *src, int n, char *dst);
 
-#endif /* CS_MONGOOSE_SRC_HTTP_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_http_server.h"
-#endif
-/*
- * === Server API reference
- */
 
-#ifndef CS_MONGOOSE_SRC_HTTP_SERVER_H_
-#define CS_MONGOOSE_SRC_HTTP_SERVER_H_
 
-#if MG_ENABLE_HTTP
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/*
- * Parses a HTTP message.
- *
- * `is_req` should be set to 1 if parsing a request, 0 if reply.
- *
- * Returns the number of bytes parsed. If HTTP message is
- * incomplete `0` is returned. On parse error, a negative number is returned.
- */
-int mg_parse_http(const char *s, int n, struct http_message *hm, int is_req);
-
-/*
- * Searches and returns the header `name` in parsed HTTP message `hm`.
- * If header is not found, NULL is returned. Example:
- *
- *     struct mg_str *host_hdr = mg_get_http_header(hm, "Host");
- */
-struct mg_str *mg_get_http_header(struct http_message *hm, const char *name);
-
-/*
- * Parses the HTTP header `hdr`. Finds variable `var_name` and stores its value
- * in the buffer `*buf`, `buf_size`. If the buffer size is not enough,
- * allocates a buffer of required size and writes it to `*buf`, similar to
- * asprintf(). The caller should always check whether the buffer was updated,
- * and free it if so.
- *
- * This function is supposed to parse cookies, authentication headers, etc.
- * Example (error handling omitted):
- *
- *     char user_buf[20];
- *     char *user = user_buf;
- *     struct mg_str *hdr = mg_get_http_header(hm, "Authorization");
- *     mg_http_parse_header2(hdr, "username", &user, sizeof(user_buf));
- *     // ... do something useful with user
- *     if (user != user_buf) {
- *       free(user);
- *     }
- *
- * Returns the length of the variable's value. If variable is not found, 0 is
- * returned.
- */
-int mg_http_parse_header2(struct mg_str *hdr, const char *var_name, char **buf,
-                          size_t buf_size);
-
-/*
- * DEPRECATED: use mg_http_parse_header2() instead.
- *
- * Same as mg_http_parse_header2(), but takes buffer as a `char *` (instead of
- * `char **`), and thus it cannot allocate a new buffer if the provided one
- * is not enough, and just returns 0 in that case.
- */
-int mg_http_parse_header(struct mg_str *hdr, const char *var_name, char *buf,
-                         size_t buf_size)
-#ifdef __GNUC__
-    __attribute__((deprecated))
-#endif
-    ;
-
-/*
- * Gets and parses the Authorization: Basic header
- * Returns -1 if no Authorization header is found, or if
- * mg_parse_http_basic_auth
- * fails parsing the resulting header.
- */
-int mg_get_http_basic_auth(struct http_message *hm, char *user, size_t user_len,
-                           char *pass, size_t pass_len);
-
-/*
- * Parses the Authorization: Basic header
- * Returns -1 iif the authorization type is not "Basic" or any other error such
- * as incorrectly encoded base64 user password pair.
- */
-int mg_parse_http_basic_auth(struct mg_str *hdr, char *user, size_t user_len,
-                             char *pass, size_t pass_len);
-
-/*
- * Parses the buffer `buf`, `buf_len` that contains multipart form data chunks.
- * Stores the chunk name in a `var_name`, `var_name_len` buffer.
- * If a chunk is an uploaded file, then `file_name`, `file_name_len` is
- * filled with an uploaded file name. `chunk`, `chunk_len`
- * points to the chunk data.
- *
- * Return: number of bytes to skip to the next chunk or 0 if there are
- *         no more chunks.
- *
- * Usage example:
- *
- * ```c
- *    static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
- *      switch(ev) {
- *        case MG_EV_HTTP_REQUEST: {
- *          struct http_message *hm = (struct http_message *) ev_data;
- *          char var_name[100], file_name[100];
- *          const char *chunk;
- *          size_t chunk_len, n1, n2;
- *
- *          n1 = n2 = 0;
- *          while ((n2 = mg_parse_multipart(hm->body.p + n1,
- *                                          hm->body.len - n1,
- *                                          var_name, sizeof(var_name),
- *                                          file_name, sizeof(file_name),
- *                                          &chunk, &chunk_len)) > 0) {
- *            printf("var: %s, file_name: %s, size: %d, chunk: [%.*s]\n",
- *                   var_name, file_name, (int) chunk_len,
- *                   (int) chunk_len, chunk);
- *            n1 += n2;
- *          }
- *        }
- *        break;
- * ```
- */
-size_t mg_parse_multipart(const char *buf, size_t buf_len, char *var_name,
-                          size_t var_name_len, char *file_name,
-                          size_t file_name_len, const char **chunk,
-                          size_t *chunk_len);
-
-/*
- * Fetches a HTTP form variable.
- *
- * Fetches a variable `name` from a `buf` into a buffer specified by `dst`,
- * `dst_len`. The destination is always zero-terminated. Returns the length of
- * a fetched variable. If not found, 0 is returned. `buf` must be valid
- * url-encoded buffer. If destination is too small or an error occured,
- * negative number is returned.
- */
-int mg_get_http_var(const struct mg_str *buf, const char *name, char *dst,
-                    size_t dst_len);
-
-#if MG_ENABLE_FILESYSTEM
-/*
- * This structure defines how `mg_serve_http()` works.
- * Best practice is to set only required settings, and leave the rest as NULL.
- */
-struct mg_serve_http_opts {
-  /* Path to web root directory */
-  const char *document_root;
-
-  /* List of index files. Default is "" */
-  const char *index_files;
-
-  /*
-   * Leave as NULL to disable authentication.
-   * To enable directory protection with authentication, set this to ".htpasswd"
-   * Then, creating ".htpasswd" file in any directory automatically protects
-   * it with digest authentication.
-   * Use `mongoose` web server binary, or `htdigest` Apache utility to
-   * create/manipulate passwords file.
-   * Make sure `auth_domain` is set to a valid domain name.
-   */
-  const char *per_directory_auth_file;
-
-  /* Authorization domain (domain name of this web server) */
-  const char *auth_domain;
-
-  /*
-   * Leave as NULL to disable authentication.
-   * Normally, only selected directories in the document root are protected.
-   * If absolutely every access to the web server needs to be authenticated,
-   * regardless of the URI, set this option to the path to the passwords file.
-   * Format of that file is the same as ".htpasswd" file. Make sure that file
-   * is located outside document root to prevent people fetching it.
-   */
-  const char *global_auth_file;
-
-  /* Set to "no" to disable directory listing. Enabled by default. */
-  const char *enable_directory_listing;
-
-  /*
-   * SSI files pattern. If not set, "**.shtml$|**.shtm$" is used.
-   *
-   * All files that match ssi_pattern are treated as SSI.
-   *
-   * Server Side Includes (SSI) is a simple interpreted server-side scripting
-   * language which is most commonly used to include the contents of a file
-   * into a web page. It can be useful when it is desirable to include a common
-   * piece of code throughout a website, for example, headers and footers.
-   *
-   * In order for a webpage to recognize an SSI-enabled HTML file, the
-   * filename should end with a special extension, by default the extension
-   * should be either .shtml or .shtm
-   *
-   * Unknown SSI directives are silently ignored by Mongoose. Currently,
-   * the following SSI directives are supported:
-   *    &lt;!--#include FILE_TO_INCLUDE --&gt;
-   *    &lt;!--#exec "COMMAND_TO_EXECUTE" --&gt;
-   *    &lt;!--#call COMMAND --&gt;
-   *
-   * Note that &lt;!--#include ...> directive supports three path
-   *specifications:
-   *
-   * &lt;!--#include virtual="path" --&gt;  Path is relative to web server root
-   * &lt;!--#include abspath="path" --&gt;  Path is absolute or relative to the
-   *                                  web server working dir
-   * &lt;!--#include file="path" --&gt;,    Path is relative to current document
-   * &lt;!--#include "path" --&gt;
-   *
-   * The include directive may be used to include the contents of a file or
-   * the result of running a CGI script.
-   *
-   * The exec directive is used to execute
-   * a command on a server, and show command's output. Example:
-   *
-   * &lt;!--#exec "ls -l" --&gt;
-   *
-   * The call directive is a way to invoke a C handler from the HTML page.
-   * On each occurence of &lt;!--#call COMMAND OPTIONAL_PARAMS> directive,
-   * Mongoose calls a registered event handler with MG_EV_SSI_CALL event,
-   * and event parameter will point to the COMMAND OPTIONAL_PARAMS string.
-   * An event handler can output any text, for example by calling
-   * `mg_printf()`. This is a flexible way of generating a web page on
-   * server side by calling a C event handler. Example:
-   *
-   * &lt;!--#call foo --&gt; ... &lt;!--#call bar --&gt;
-   *
-   * In the event handler:
-   *    case MG_EV_SSI_CALL: {
-   *      const char *param = (const char *) ev_data;
-   *      if (strcmp(param, "foo") == 0) {
-   *        mg_printf(c, "hello from foo");
-   *      } else if (strcmp(param, "bar") == 0) {
-   *        mg_printf(c, "hello from bar");
-   *      }
-   *      break;
-   *    }
-   */
-  const char *ssi_pattern;
-
-  /* IP ACL. By default, NULL, meaning all IPs are allowed to connect */
-  const char *ip_acl;
-
-#if MG_ENABLE_HTTP_URL_REWRITES
-  /* URL rewrites.
-   *
-   * Comma-separated list of `uri_pattern=url_file_or_directory_path` rewrites.
-   * When HTTP request is received, Mongoose constructs a file name from the
-   * requested URI by combining `document_root` and the URI. However, if the
-   * rewrite option is used and `uri_pattern` matches requested URI, then
-   * `document_root` is ignored. Instead, `url_file_or_directory_path` is used,
-   * which should be a full path name or a path relative to the web server's
-   * current working directory. It can also be an URI (http:// or https://)
-   * in which case mongoose will behave as a reverse proxy for that destination.
-   *
-   * Note that `uri_pattern`, as all Mongoose patterns, is a prefix pattern.
-   *
-   * If uri_pattern starts with `@` symbol, then Mongoose compares it with the
-   * HOST header of the request. If they are equal, Mongoose sets document root
-   * to `file_or_directory_path`, implementing virtual hosts support.
-   * Example: `@foo.com=/document/root/for/foo.com`
-   *
-   * If `uri_pattern` starts with `%` symbol, then Mongoose compares it with
-   * the listening port. If they match, then Mongoose issues a 301 redirect.
-   * For example, to redirect all HTTP requests to the
-   * HTTPS port, do `%80=https://my.site.com`. Note that the request URI is
-   * automatically appended to the redirect location.
-   */
-  const char *url_rewrites;
-#endif
+typedef struct {
+  uint32_t buf[4];
+  uint32_t bits[2];
+  unsigned char in[64];
+} mg_md5_ctx;
 
-  /* DAV document root. If NULL, DAV requests are going to fail. */
-  const char *dav_document_root;
+void mg_md5_init(mg_md5_ctx *c);
+void mg_md5_update(mg_md5_ctx *c, const unsigned char *data, size_t len);
+void mg_md5_final(mg_md5_ctx *c, unsigned char[16]);
 
-  /*
-   * DAV passwords file. If NULL, DAV requests are going to fail.
-   * If passwords file is set to "-", then DAV auth is disabled.
-   */
-  const char *dav_auth_file;
 
-  /* Glob pattern for the files to hide. */
-  const char *hidden_file_pattern;
 
-  /* Set to non-NULL to enable CGI, e.g. **.cgi$|**.php$" */
-  const char *cgi_file_pattern;
 
-  /* If not NULL, ignore CGI script hashbang and use this interpreter */
-  const char *cgi_interpreter;
+typedef struct {
+  uint32_t state[5];
+  uint32_t count[2];
+  unsigned char buffer[64];
+} mg_sha1_ctx;
 
-  /*
-   * Comma-separated list of Content-Type overrides for path suffixes, e.g.
-   * ".txt=text/plain; charset=utf-8,.c=text/plain"
-   */
-  const char *custom_mime_types;
+void mg_sha1_init(mg_sha1_ctx *);
+void mg_sha1_update(mg_sha1_ctx *, const unsigned char *data, size_t len);
+void mg_sha1_final(unsigned char digest[20], mg_sha1_ctx *);
+void mg_hmac_sha1(const unsigned char *key, size_t key_len,
+                  const unsigned char *text, size_t text_len,
+                  unsigned char out[20]);
 
-  /*
-   * Extra HTTP headers to add to each server response.
-   * Example: to enable CORS, set this to "Access-Control-Allow-Origin: *".
-   */
-  const char *extra_headers;
-};
 
-/*
- * Serves given HTTP request according to the `options`.
- *
- * Example code snippet:
- *
- * ```c
- * static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
- *   struct http_message *hm = (struct http_message *) ev_data;
- *   struct mg_serve_http_opts opts = { .document_root = "/var/www" };  // C99
- *
- *   switch (ev) {
- *     case MG_EV_HTTP_REQUEST:
- *       mg_serve_http(nc, hm, opts);
- *       break;
- *     default:
- *       break;
- *   }
- * }
- * ```
- */
-void mg_serve_http(struct mg_connection *nc, struct http_message *hm,
-                   struct mg_serve_http_opts opts);
-
-/*
- * Serves a specific file with a given MIME type and optional extra headers.
- *
- * Example code snippet:
- *
- * ```c
- * static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
- *   switch (ev) {
- *     case MG_EV_HTTP_REQUEST: {
- *       struct http_message *hm = (struct http_message *) ev_data;
- *       mg_http_serve_file(nc, hm, "file.txt",
- *                          mg_mk_str("text/plain"), mg_mk_str(""));
- *       break;
- *     }
- *     ...
- *   }
- * }
- * ```
- */
-void mg_http_serve_file(struct mg_connection *nc, struct http_message *hm,
-                        const char *path, const struct mg_str mime_type,
-                        const struct mg_str extra_headers);
-
-#if MG_ENABLE_HTTP_STREAMING_MULTIPART
-
-/* Callback prototype for `mg_file_upload_handler()`. */
-typedef struct mg_str (*mg_fu_fname_fn)(struct mg_connection *nc,
-                                        struct mg_str fname);
-
-/*
- * File upload handler.
- * This handler can be used to implement file uploads with minimum code.
- * This handler will process MG_EV_HTTP_PART_* events and store file data into
- * a local file.
- * `local_name_fn` will be invoked with whatever name was provided by the client
- * and will expect the name of the local file to open. A return value of NULL
- * will abort file upload (client will get a "403 Forbidden" response). If
- * non-null, the returned string must be heap-allocated and will be freed by
- * the caller.
- * Exception: it is ok to return the same string verbatim.
- *
- * Example:
- *
- * ```c
- * struct mg_str upload_fname(struct mg_connection *nc, struct mg_str fname) {
- *   // Just return the same filename. Do not actually do this except in test!
- *   // fname is user-controlled and needs to be sanitized.
- *   return fname;
- * }
- * void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
- *   switch (ev) {
- *     ...
- *     case MG_EV_HTTP_PART_BEGIN:
- *     case MG_EV_HTTP_PART_DATA:
- *     case MG_EV_HTTP_PART_END:
- *       mg_file_upload_handler(nc, ev, ev_data, upload_fname);
- *       break;
- *   }
- * }
- * ```
- */
-void mg_file_upload_handler(struct mg_connection *nc, int ev, void *ev_data,
-                            mg_fu_fname_fn local_name_fn
-                                MG_UD_ARG(void *user_data));
-#endif /* MG_ENABLE_HTTP_STREAMING_MULTIPART */
-#endif /* MG_ENABLE_FILESYSTEM */
-
-/*
- * Registers a callback for a specified http endpoint
- * Note: if callback is registered it is called instead of the
- * callback provided in mg_bind
- *
- * Example code snippet:
- *
- * ```c
- * static void handle_hello1(struct mg_connection *nc, int ev, void *ev_data) {
- *   (void) ev; (void) ev_data;
- *   mg_printf(nc, "HTTP/1.0 200 OK\r\n\r\n[I am Hello1]");
- *  nc->flags |= MG_F_SEND_AND_CLOSE;
- * }
- *
- * static void handle_hello2(struct mg_connection *nc, int ev, void *ev_data) {
- *  (void) ev; (void) ev_data;
- *   mg_printf(nc, "HTTP/1.0 200 OK\r\n\r\n[I am Hello2]");
- *  nc->flags |= MG_F_SEND_AND_CLOSE;
- * }
- *
- * void init() {
- *   nc = mg_bind(&mgr, local_addr, cb1);
- *   mg_register_http_endpoint(nc, "/hello1", handle_hello1);
- *   mg_register_http_endpoint(nc, "/hello1/hello2", handle_hello2);
- * }
- * ```
- */
-void mg_register_http_endpoint(struct mg_connection *nc, const char *uri_path,
-                               MG_CB(mg_event_handler_t handler,
-                                     void *user_data));
-
-struct mg_http_endpoint_opts {
-  void *user_data;
-  /* Authorization domain (realm) */
-  const char *auth_domain;
-  const char *auth_file;
+struct mg_connection;
+typedef void (*mg_event_handler_t)(struct mg_connection *, int ev,
+                                   void *ev_data, void *fn_data);
+void mg_call(struct mg_connection *c, int ev, void *ev_data);
+void mg_error(struct mg_connection *c, const char *fmt, ...);
+
+enum {
+  MG_EV_ERROR,       // Error                        char *error_message
+  MG_EV_OPEN,        // Connection created           NULL
+  MG_EV_POLL,        // mg_mgr_poll iteration        int64_t *milliseconds
+  MG_EV_RESOLVE,     // Host name is resolved        NULL
+  MG_EV_CONNECT,     // Connection established       NULL
+  MG_EV_ACCEPT,      // Connection accepted          NULL
+  MG_EV_READ,        // Data received from socket    struct mg_str *
+  MG_EV_WRITE,       // Data written to socket       long *bytes_written
+  MG_EV_CLOSE,       // Connection closed            NULL
+  MG_EV_HTTP_MSG,    // HTTP request/response        struct mg_http_message *
+  MG_EV_HTTP_CHUNK,  // HTTP chunk (partial msg)     struct mg_http_message *
+  MG_EV_WS_OPEN,     // Websocket handshake done     struct mg_http_message *
+  MG_EV_WS_MSG,      // Websocket msg, text or bin   struct mg_ws_message *
+  MG_EV_WS_CTL,      // Websocket control msg        struct mg_ws_message *
+  MG_EV_MQTT_CMD,    // MQTT low-level command       struct mg_mqtt_message *
+  MG_EV_MQTT_MSG,    // MQTT PUBLISH received        struct mg_mqtt_message *
+  MG_EV_MQTT_OPEN,   // MQTT CONNACK received        int *connack_status_code
+  MG_EV_SNTP_TIME,   // SNTP time received           int64_t *milliseconds
+  MG_EV_USER,        // Starting ID for user events
 };
 
-void mg_register_http_endpoint_opt(struct mg_connection *nc,
-                                   const char *uri_path,
-                                   mg_event_handler_t handler,
-                                   struct mg_http_endpoint_opts opts);
-
-/*
- * Authenticates a HTTP request against an opened password file.
- * Returns 1 if authenticated, 0 otherwise.
- */
-int mg_http_check_digest_auth(struct http_message *hm, const char *auth_domain,
-                              FILE *fp);
-
-/*
- * Authenticates given response params against an opened password file.
- * Returns 1 if authenticated, 0 otherwise.
- *
- * It's used by mg_http_check_digest_auth().
- */
-int mg_check_digest_auth(struct mg_str method, struct mg_str uri,
-                         struct mg_str username, struct mg_str cnonce,
-                         struct mg_str response, struct mg_str qop,
-                         struct mg_str nc, struct mg_str nonce,
-                         struct mg_str auth_domain, FILE *fp);
-
-/*
- * Sends buffer `buf` of size `len` to the client using chunked HTTP encoding.
- * This function sends the buffer size as hex number + newline first, then
- * the buffer itself, then the newline. For example,
- * `mg_send_http_chunk(nc, "foo", 3)` will append the `3\r\nfoo\r\n` string
- * to the `nc->send_mbuf` output IO buffer.
- *
- * NOTE: The HTTP header "Transfer-Encoding: chunked" should be sent prior to
- * using this function.
- *
- * NOTE: do not forget to send an empty chunk at the end of the response,
- * to tell the client that everything was sent. Example:
- *
- * ```
- *   mg_printf_http_chunk(nc, "%s", "my response!");
- *   mg_send_http_chunk(nc, "", 0); // Tell the client we're finished
- * ```
- */
-void mg_send_http_chunk(struct mg_connection *nc, const char *buf, size_t len);
-
-/*
- * Sends a printf-formatted HTTP chunk.
- * Functionality is similar to `mg_send_http_chunk()`.
- */
-void mg_printf_http_chunk(struct mg_connection *nc, const char *fmt, ...);
-
-/*
- * Sends the response status line.
- * If `extra_headers` is not NULL, then `extra_headers` are also sent
- * after the response line. `extra_headers` must NOT end end with new line.
- * Example:
- *
- *      mg_send_response_line(nc, 200, "Access-Control-Allow-Origin: *");
- *
- * Will result in:
- *
- *      HTTP/1.1 200 OK\r\n
- *      Access-Control-Allow-Origin: *\r\n
- */
-void mg_send_response_line(struct mg_connection *nc, int status_code,
-                           const char *extra_headers);
-
-/*
- * Sends an error response. If reason is NULL, the message will be inferred
- * from the error code (if supported).
- */
-void mg_http_send_error(struct mg_connection *nc, int code, const char *reason);
-
-/*
- * Sends a redirect response.
- * `status_code` should be either 301 or 302 and `location` point to the
- * new location.
- * If `extra_headers` is not empty, then `extra_headers` are also sent
- * after the response line. `extra_headers` must NOT end end with new line.
- *
- * Example:
- *
- *      mg_http_send_redirect(nc, 302, mg_mk_str("/login"), mg_mk_str(NULL));
- */
-void mg_http_send_redirect(struct mg_connection *nc, int status_code,
-                           const struct mg_str location,
-                           const struct mg_str extra_headers);
-
-/*
- * Sends the response line and headers.
- * This function sends the response line with the `status_code`, and
- * automatically
- * sends one header: either "Content-Length" or "Transfer-Encoding".
- * If `content_length` is negative, then "Transfer-Encoding: chunked" header
- * is sent, otherwise, "Content-Length" header is sent.
- *
- * NOTE: If `Transfer-Encoding` is `chunked`, then message body must be sent
- * using `mg_send_http_chunk()` or `mg_printf_http_chunk()` functions.
- * Otherwise, `mg_send()` or `mg_printf()` must be used.
- * Extra headers could be set through `extra_headers`. Note `extra_headers`
- * must NOT be terminated by a new line.
- */
-void mg_send_head(struct mg_connection *n, int status_code,
-                  int64_t content_length, const char *extra_headers);
-
-/*
- * Sends a printf-formatted HTTP chunk, escaping HTML tags.
- */
-void mg_printf_html_escape(struct mg_connection *nc, const char *fmt, ...);
-
-#if MG_ENABLE_HTTP_URL_REWRITES
-/*
- * Proxies a given request to a given upstream http server. The path prefix
- * in `mount` will be stripped of the path requested to the upstream server,
- * e.g. if mount is /api and upstream is http://localhost:8001/foo
- * then an incoming request to /api/bar will cause a request to
- * http://localhost:8001/foo/bar
- *
- * EXPERIMENTAL API. Please use http_serve_http + url_rewrites if a static
- * mapping is good enough.
- */
-void mg_http_reverse_proxy(struct mg_connection *nc,
-                           const struct http_message *hm, struct mg_str mount,
-                           struct mg_str upstream);
-#endif
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* MG_ENABLE_HTTP */
-
-#endif /* CS_MONGOOSE_SRC_HTTP_SERVER_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_http_client.h"
-#endif
-/*
- * === Client API reference
- */
-
-#ifndef CS_MONGOOSE_SRC_HTTP_CLIENT_H_
-#define CS_MONGOOSE_SRC_HTTP_CLIENT_H_
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/*
- * Helper function that creates an outbound HTTP connection.
- *
- * `url` is the URL to fetch. It must be properly URL-encoded, e.g. have
- * no spaces, etc. By default, `mg_connect_http()` sends the Connection and
- * Host headers. `extra_headers` is an extra HTTP header to send, e.g.
- * `"User-Agent: my-app\r\n"`.
- * If `post_data` is NULL, then a GET request is created. Otherwise, a POST
- * request is created with the specified POST data. Note that if the data being
- * posted is a form submission, the `Content-Type` header should be set
- * accordingly (see example below).
- *
- * Examples:
- *
- * ```c
- *   nc1 = mg_connect_http(mgr, ev_handler_1, "http://www.google.com", NULL,
- *                         NULL);
- *   nc2 = mg_connect_http(mgr, ev_handler_1, "https://github.com", NULL, NULL);
- *   nc3 = mg_connect_http(
- *       mgr, ev_handler_1, "my_server:8000/form_submit/",
- *       "Content-Type: application/x-www-form-urlencoded\r\n",
- *       "var_1=value_1&var_2=value_2");
- * ```
- */
-struct mg_connection *mg_connect_http(
-    struct mg_mgr *mgr,
-    MG_CB(mg_event_handler_t event_handler, void *user_data), const char *url,
-    const char *extra_headers, const char *post_data);
-
-/*
- * Helper function that creates an outbound HTTP connection.
- *
- * Mostly identical to mg_connect_http, but allows you to provide extra
- *parameters
- * (for example, SSL parameters)
- */
-struct mg_connection *mg_connect_http_opt(
-    struct mg_mgr *mgr, MG_CB(mg_event_handler_t ev_handler, void *user_data),
-    struct mg_connect_opts opts, const char *url, const char *extra_headers,
-    const char *post_data);
-
-/* Creates digest authentication header for a client request. */
-int mg_http_create_digest_auth_header(char *buf, size_t buf_len,
-                                      const char *method, const char *uri,
-                                      const char *auth_domain, const char *user,
-                                      const char *passwd, const char *nonce);
 
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* CS_MONGOOSE_SRC_HTTP_CLIENT_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_mqtt.h"
-#endif
 
-/*
- * === MQTT API reference
- */
 
-#ifndef CS_MONGOOSE_SRC_MQTT_H_
-#define CS_MONGOOSE_SRC_MQTT_H_
 
-/* Amalgamated: #include "mg_net.h" */
 
-struct mg_mqtt_message {
-  int cmd;
-  int qos;
-  int len; /* message length in the IO buffer */
-  struct mg_str topic;
-  struct mg_str payload;
-
-  uint8_t connack_ret_code; /* connack */
-  uint16_t message_id;      /* puback */
-
-  /* connect */
-  uint8_t protocol_version;
-  uint8_t connect_flags;
-  uint16_t keep_alive_timer;
-  struct mg_str protocol_name;
-  struct mg_str client_id;
-  struct mg_str will_topic;
-  struct mg_str will_message;
-  struct mg_str user_name;
-  struct mg_str password;
+struct mg_dns {
+  const char *url;          // DNS server URL
+  struct mg_connection *c;  // DNS server connection
 };
 
-struct mg_mqtt_topic_expression {
-  const char *topic;
-  uint8_t qos;
+struct mg_addr {
+  uint16_t port;    // TCP or UDP port in network byte order
+  uint32_t ip;      // IP address in network byte order
+  uint8_t ip6[16];  // IPv6 address
+  bool is_ip6;      // True when address is IPv6 address
 };
 
-struct mg_send_mqtt_handshake_opts {
-  unsigned char flags; /* connection flags */
-  uint16_t keep_alive;
-  const char *will_topic;
-  const char *will_message;
-  const char *user_name;
-  const char *password;
+struct mg_mgr {
+  struct mg_connection *conns;  // List of active connections
+  struct mg_dns dns4;           // DNS for IPv4
+  struct mg_dns dns6;           // DNS for IPv6
+  int dnstimeout;               // DNS resolve timeout in milliseconds
+  unsigned long nextid;         // Next connection ID
+  void *userdata;               // Arbitrary user data pointer
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+  SocketSet_t ss;  // NOTE(lsm): referenced from socket struct
+#endif
 };
 
-/* mg_mqtt_proto_data should be in header to allow external access to it */
-struct mg_mqtt_proto_data {
-  uint16_t keep_alive;
-  double last_control_time;
+struct mg_connection {
+  struct mg_connection *next;  // Linkage in struct mg_mgr :: connections
+  struct mg_mgr *mgr;          // Our container
+  struct mg_addr peer;         // Remote address. For listeners, local address
+  void *fd;                    // Connected socket, or LWIP data
+  unsigned long id;            // Auto-incrementing unique connection ID
+  struct mg_iobuf recv;        // Incoming data
+  struct mg_iobuf send;        // Outgoing data
+  mg_event_handler_t fn;       // User-specified event handler function
+  void *fn_data;               // User-specified function parameter
+  mg_event_handler_t pfn;      // Protocol-specific handler function
+  void *pfn_data;              // Protocol-specific function parameter
+  char label[50];              // Arbitrary label
+  void *tls;                   // TLS specific data
+  unsigned is_listening : 1;   // Listening connection
+  unsigned is_client : 1;      // Outbound (client) connection
+  unsigned is_accepted : 1;    // Accepted (server) connection
+  unsigned is_resolving : 1;   // Non-blocking DNS resolution is in progress
+  unsigned is_connecting : 1;  // Non-blocking connect is in progress
+  unsigned is_tls : 1;         // TLS-enabled connection
+  unsigned is_tls_hs : 1;      // TLS handshake is in progress
+  unsigned is_udp : 1;         // UDP connection
+  unsigned is_websocket : 1;   // WebSocket connection
+  unsigned is_hexdumping : 1;  // Hexdump in/out traffic
+  unsigned is_draining : 1;    // Send remaining data, then close and free
+  unsigned is_closing : 1;     // Close and free the connection immediately
+  unsigned is_readable : 1;    // Connection is ready to read
+  unsigned is_writable : 1;    // Connection is ready to write
 };
 
-/* Message types */
-#define MG_MQTT_CMD_CONNECT 1
-#define MG_MQTT_CMD_CONNACK 2
-#define MG_MQTT_CMD_PUBLISH 3
-#define MG_MQTT_CMD_PUBACK 4
-#define MG_MQTT_CMD_PUBREC 5
-#define MG_MQTT_CMD_PUBREL 6
-#define MG_MQTT_CMD_PUBCOMP 7
-#define MG_MQTT_CMD_SUBSCRIBE 8
-#define MG_MQTT_CMD_SUBACK 9
-#define MG_MQTT_CMD_UNSUBSCRIBE 10
-#define MG_MQTT_CMD_UNSUBACK 11
-#define MG_MQTT_CMD_PINGREQ 12
-#define MG_MQTT_CMD_PINGRESP 13
-#define MG_MQTT_CMD_DISCONNECT 14
-
-/* MQTT event types */
-#define MG_MQTT_EVENT_BASE 200
-#define MG_EV_MQTT_CONNECT (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_CONNECT)
-#define MG_EV_MQTT_CONNACK (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_CONNACK)
-#define MG_EV_MQTT_PUBLISH (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PUBLISH)
-#define MG_EV_MQTT_PUBACK (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PUBACK)
-#define MG_EV_MQTT_PUBREC (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PUBREC)
-#define MG_EV_MQTT_PUBREL (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PUBREL)
-#define MG_EV_MQTT_PUBCOMP (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PUBCOMP)
-#define MG_EV_MQTT_SUBSCRIBE (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_SUBSCRIBE)
-#define MG_EV_MQTT_SUBACK (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_SUBACK)
-#define MG_EV_MQTT_UNSUBSCRIBE (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_UNSUBSCRIBE)
-#define MG_EV_MQTT_UNSUBACK (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_UNSUBACK)
-#define MG_EV_MQTT_PINGREQ (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PINGREQ)
-#define MG_EV_MQTT_PINGRESP (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_PINGRESP)
-#define MG_EV_MQTT_DISCONNECT (MG_MQTT_EVENT_BASE + MG_MQTT_CMD_DISCONNECT)
-
-/* Message flags */
-#define MG_MQTT_RETAIN 0x1
-#define MG_MQTT_QOS(qos) ((qos) << 1)
-#define MG_MQTT_GET_QOS(flags) (((flags) &0x6) >> 1)
-#define MG_MQTT_SET_QOS(flags, qos) (flags) = ((flags) & ~0x6) | ((qos) << 1)
-#define MG_MQTT_DUP 0x8
-
-/* Connection flags */
-#define MG_MQTT_CLEAN_SESSION 0x02
-#define MG_MQTT_HAS_WILL 0x04
-#define MG_MQTT_WILL_RETAIN 0x20
-#define MG_MQTT_HAS_PASSWORD 0x40
-#define MG_MQTT_HAS_USER_NAME 0x80
-#define MG_MQTT_GET_WILL_QOS(flags) (((flags) &0x18) >> 3)
-#define MG_MQTT_SET_WILL_QOS(flags, qos) \
-  (flags) = ((flags) & ~0x18) | ((qos) << 3)
-
-/* CONNACK return codes */
-#define MG_EV_MQTT_CONNACK_ACCEPTED 0
-#define MG_EV_MQTT_CONNACK_UNACCEPTABLE_VERSION 1
-#define MG_EV_MQTT_CONNACK_IDENTIFIER_REJECTED 2
-#define MG_EV_MQTT_CONNACK_SERVER_UNAVAILABLE 3
-#define MG_EV_MQTT_CONNACK_BAD_AUTH 4
-#define MG_EV_MQTT_CONNACK_NOT_AUTHORIZED 5
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/*
- * Attaches a built-in MQTT event handler to the given connection.
- *
- * The user-defined event handler will receive following extra events:
- *
- * - MG_EV_MQTT_CONNACK
- * - MG_EV_MQTT_PUBLISH
- * - MG_EV_MQTT_PUBACK
- * - MG_EV_MQTT_PUBREC
- * - MG_EV_MQTT_PUBREL
- * - MG_EV_MQTT_PUBCOMP
- * - MG_EV_MQTT_SUBACK
- */
-void mg_set_protocol_mqtt(struct mg_connection *nc);
-
-/* Sends an MQTT handshake. */
-void mg_send_mqtt_handshake(struct mg_connection *nc, const char *client_id);
-
-/* Sends an MQTT handshake with optional parameters. */
-void mg_send_mqtt_handshake_opt(struct mg_connection *nc, const char *client_id,
-                                struct mg_send_mqtt_handshake_opts);
-
-/* Publishes a message to a given topic. */
-void mg_mqtt_publish(struct mg_connection *nc, const char *topic,
-                     uint16_t message_id, int flags, const void *data,
-                     size_t len);
-
-/* Subscribes to a bunch of topics. */
-void mg_mqtt_subscribe(struct mg_connection *nc,
-                       const struct mg_mqtt_topic_expression *topics,
-                       size_t topics_len, uint16_t message_id);
-
-/* Unsubscribes from a bunch of topics. */
-void mg_mqtt_unsubscribe(struct mg_connection *nc, char **topics,
-                         size_t topics_len, uint16_t message_id);
-
-/* Sends a DISCONNECT command. */
-void mg_mqtt_disconnect(struct mg_connection *nc);
-
-/* Sends a CONNACK command with a given `return_code`. */
-void mg_mqtt_connack(struct mg_connection *nc, uint8_t return_code);
-
-/* Sends a PUBACK command with a given `message_id`. */
-void mg_mqtt_puback(struct mg_connection *nc, uint16_t message_id);
-
-/* Sends a PUBREC command with a given `message_id`. */
-void mg_mqtt_pubrec(struct mg_connection *nc, uint16_t message_id);
-
-/* Sends a PUBREL command with a given `message_id`. */
-void mg_mqtt_pubrel(struct mg_connection *nc, uint16_t message_id);
-
-/* Sends a PUBCOMP command with a given `message_id`. */
-void mg_mqtt_pubcomp(struct mg_connection *nc, uint16_t message_id);
-
-/*
- * Sends a SUBACK command with a given `message_id`
- * and a sequence of granted QoSs.
- */
-void mg_mqtt_suback(struct mg_connection *nc, uint8_t *qoss, size_t qoss_len,
-                    uint16_t message_id);
-
-/* Sends a UNSUBACK command with a given `message_id`. */
-void mg_mqtt_unsuback(struct mg_connection *nc, uint16_t message_id);
-
-/* Sends a PINGREQ command. */
-void mg_mqtt_ping(struct mg_connection *nc);
-
-/* Sends a PINGRESP command. */
-void mg_mqtt_pong(struct mg_connection *nc);
-
-/*
- * Extracts the next topic expression from a SUBSCRIBE command payload.
- *
- * The topic expression name will point to a string in the payload buffer.
- * Returns the pos of the next topic expression or -1 when the list
- * of topics is exhausted.
- */
-int mg_mqtt_next_subscribe_topic(struct mg_mqtt_message *msg,
-                                 struct mg_str *topic, uint8_t *qos, int pos);
-
-/*
- * Matches a topic against a topic expression
- *
- * Returns 1 if it matches; 0 otherwise.
- */
-int mg_mqtt_match_topic_expression(struct mg_str exp, struct mg_str topic);
-
-/*
- * Same as `mg_mqtt_match_topic_expression()`, but takes `exp` as a
- * NULL-terminated string.
- */
-int mg_mqtt_vmatch_topic_expression(const char *exp, struct mg_str topic);
+void mg_mgr_poll(struct mg_mgr *, int ms);
+void mg_mgr_init(struct mg_mgr *);
+void mg_mgr_free(struct mg_mgr *);
 
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
+struct mg_connection *mg_listen(struct mg_mgr *, const char *url,
+                                mg_event_handler_t fn, void *fn_data);
+struct mg_connection *mg_connect(struct mg_mgr *, const char *url,
+                                 mg_event_handler_t fn, void *fn_data);
+void mg_connect_resolved(struct mg_connection *);
+bool mg_send(struct mg_connection *, const void *, size_t);
+int mg_printf(struct mg_connection *, const char *fmt, ...);
+int mg_vprintf(struct mg_connection *, const char *fmt, va_list ap);
+char *mg_straddr(struct mg_addr *, char *, size_t);
+bool mg_aton(struct mg_str str, struct mg_addr *addr);
+char *mg_ntoa(const struct mg_addr *addr, char *buf, size_t len);
 
-#endif /* CS_MONGOOSE_SRC_MQTT_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_mqtt_server.h"
-#endif
+struct mg_connection *mg_mkpipe(struct mg_mgr *, mg_event_handler_t, void *);
+void mg_mgr_wakeup(struct mg_connection *pipe, const void *buf, size_t len);
 
-/*
- * === MQTT Server API reference
- */
 
-#ifndef CS_MONGOOSE_SRC_MQTT_BROKER_H_
-#define CS_MONGOOSE_SRC_MQTT_BROKER_H_
 
-#if MG_ENABLE_MQTT_BROKER
 
-/* Amalgamated: #include "common/queue.h" */
-/* Amalgamated: #include "mg_mqtt.h" */
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
 
-#ifndef MG_MQTT_MAX_SESSION_SUBSCRIPTIONS
-#define MG_MQTT_MAX_SESSION_SUBSCRIPTIONS 512
-#endif
 
-struct mg_mqtt_broker;
 
-/* MQTT session (Broker side). */
-struct mg_mqtt_session {
-  struct mg_mqtt_broker *brk;       /* Broker */
-  LIST_ENTRY(mg_mqtt_session) link; /* mg_mqtt_broker::sessions linkage */
-  struct mg_connection *nc;         /* Connection with the client */
-  size_t num_subscriptions;         /* Size of `subscriptions` array */
-  void *user_data;                  /* User data */
-  struct mg_mqtt_topic_expression *subscriptions;
+struct mg_http_header {
+  struct mg_str name;   // Header name
+  struct mg_str value;  // Header value
 };
 
-/* MQTT broker. */
-struct mg_mqtt_broker {
-  LIST_HEAD(_mg_sesshead, mg_mqtt_session) sessions; /* Session list */
-  void *user_data;                                   /* User data */
+struct mg_http_message {
+  struct mg_str method, uri, query, proto;             // Request/response line
+  struct mg_http_header headers[MG_MAX_HTTP_HEADERS];  // Headers
+  struct mg_str body;                                  // Body
+  struct mg_str head;                                  // Request + headers
+  struct mg_str chunk;    // Chunk for chunked encoding,  or partial body
+  struct mg_str message;  // Request + headers + body
 };
 
-/* Initialises a MQTT broker. */
-void mg_mqtt_broker_init(struct mg_mqtt_broker *brk, void *user_data);
-
-/*
- * Processes a MQTT broker message.
- *
- * The listening connection expects a pointer to an initialised
- * `mg_mqtt_broker` structure in the `user_data` field.
- *
- * Basic usage:
- *
- * ```c
- * mg_mqtt_broker_init(&brk, NULL);
- *
- * if ((nc = mg_bind(&mgr, address, mg_mqtt_broker)) == NULL) {
- *   // fail;
- * }
- * nc->user_data = &brk;
- * ```
- *
- * New incoming connections will receive a `mg_mqtt_session` structure
- * in the connection `user_data`. The original `user_data` will be stored
- * in the `user_data` field of the session structure. This allows the user
- * handler to store user data before `mg_mqtt_broker` creates the session.
- *
- * Since only the MG_EV_ACCEPT message is processed by the listening socket,
- * for most events the `user_data` will thus point to a `mg_mqtt_session`.
- */
-void mg_mqtt_broker(struct mg_connection *brk, int ev, void *data);
-
-/*
- * Iterates over all MQTT session connections. Example:
- *
- * ```c
- * struct mg_mqtt_session *s;
- * for (s = mg_mqtt_next(brk, NULL); s != NULL; s = mg_mqtt_next(brk, s)) {
- *   // Do something
- * }
- * ```
- */
-struct mg_mqtt_session *mg_mqtt_next(struct mg_mqtt_broker *brk,
-                                     struct mg_mqtt_session *s);
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* MG_ENABLE_MQTT_BROKER */
-#endif /* CS_MONGOOSE_SRC_MQTT_BROKER_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_dns.h"
-#endif
-
-/*
- * === DNS API reference
- */
-
-#ifndef CS_MONGOOSE_SRC_DNS_H_
-#define CS_MONGOOSE_SRC_DNS_H_
-
-/* Amalgamated: #include "mg_net.h" */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-#define MG_DNS_A_RECORD 0x01     /* Lookup IP address */
-#define MG_DNS_CNAME_RECORD 0x05 /* Lookup CNAME */
-#define MG_DNS_PTR_RECORD 0x0c   /* Lookup PTR */
-#define MG_DNS_TXT_RECORD 0x10   /* Lookup TXT */
-#define MG_DNS_AAAA_RECORD 0x1c  /* Lookup IPv6 address */
-#define MG_DNS_SRV_RECORD 0x21   /* Lookup SRV */
-#define MG_DNS_MX_RECORD 0x0f    /* Lookup mail server for domain */
-#define MG_DNS_ANY_RECORD 0xff
-#define MG_DNS_NSEC_RECORD 0x2f
-
-#define MG_MAX_DNS_QUESTIONS 32
-#define MG_MAX_DNS_ANSWERS 32
-
-#define MG_DNS_MESSAGE 100 /* High-level DNS message event */
-
-enum mg_dns_resource_record_kind {
-  MG_DNS_INVALID_RECORD = 0,
-  MG_DNS_QUESTION,
-  MG_DNS_ANSWER
+// Parameter for mg_http_serve_dir()
+struct mg_http_serve_opts {
+  const char *root_dir;       // Web root directory, must be non-NULL
+  const char *ssi_pattern;    // SSI file name pattern, e.g. #.shtml
+  const char *extra_headers;  // Extra HTTP headers to add in responses
+  const char *mime_types;     // Extra mime types, ext1=type1,ext2=type2,..
+  struct mg_fs *fs;           // Filesystem implementation. Use NULL for POSIX
 };
 
-/* DNS resource record. */
-struct mg_dns_resource_record {
-  struct mg_str name; /* buffer with compressed name */
-  int rtype;
-  int rclass;
-  int ttl;
-  enum mg_dns_resource_record_kind kind;
-  struct mg_str rdata; /* protocol data (can be a compressed name) */
+// Parameter for mg_http_next_multipart
+struct mg_http_part {
+  struct mg_str name;      // Form field name
+  struct mg_str filename;  // Filename for file uploads
+  struct mg_str body;      // Part contents
 };
 
-/* DNS message (request and response). */
-struct mg_dns_message {
-  struct mg_str pkt; /* packet body */
-  uint16_t flags;
-  uint16_t transaction_id;
-  int num_questions;
-  int num_answers;
-  struct mg_dns_resource_record questions[MG_MAX_DNS_QUESTIONS];
-  struct mg_dns_resource_record answers[MG_MAX_DNS_ANSWERS];
+int mg_http_parse(const char *s, size_t len, struct mg_http_message *);
+int mg_http_get_request_len(const unsigned char *buf, size_t buf_len);
+void mg_http_printf_chunk(struct mg_connection *cnn, const char *fmt, ...);
+void mg_http_write_chunk(struct mg_connection *c, const char *buf, size_t len);
+void mg_http_delete_chunk(struct mg_connection *c, struct mg_http_message *hm);
+struct mg_connection *mg_http_listen(struct mg_mgr *, const char *url,
+                                     mg_event_handler_t fn, void *fn_data);
+struct mg_connection *mg_http_connect(struct mg_mgr *, const char *url,
+                                      mg_event_handler_t fn, void *fn_data);
+void mg_http_serve_dir(struct mg_connection *, struct mg_http_message *hm,
+                       struct mg_http_serve_opts *opts);
+void mg_http_serve_file(struct mg_connection *, struct mg_http_message *hm,
+                        const char *path, struct mg_http_serve_opts *opts);
+void mg_http_reply(struct mg_connection *, int status_code, const char *headers,
+                   const char *body_fmt, ...);
+struct mg_str *mg_http_get_header(struct mg_http_message *, const char *name);
+int mg_http_get_var(const struct mg_str *, const char *name, char *, size_t);
+int mg_url_decode(const char *s, size_t n, char *to, size_t to_len, int form);
+size_t mg_url_encode(const char *s, size_t n, char *buf, size_t len);
+void mg_http_creds(struct mg_http_message *, char *, size_t, char *, size_t);
+bool mg_http_match_uri(const struct mg_http_message *, const char *glob);
+int mg_http_upload(struct mg_connection *, struct mg_http_message *hm,
+                   struct mg_fs *fs, const char *dir);
+void mg_http_bauth(struct mg_connection *, const char *user, const char *pass);
+struct mg_str mg_http_get_header_var(struct mg_str s, struct mg_str v);
+size_t mg_http_next_multipart(struct mg_str, size_t, struct mg_http_part *);
+
+
+void mg_http_serve_ssi(struct mg_connection *c, const char *root,
+                       const char *fullpath);
+
+
+
+
+
+
+struct mg_tls_opts {
+  const char *ca;         // CA certificate file. For both listeners and clients
+  const char *crl;        // Certificate Revocation List. For clients
+  const char *cert;       // Certificate
+  const char *certkey;    // Certificate key
+  const char *ciphers;    // Cipher list
+  struct mg_str srvname;  // If not empty, enables server name verification
+  struct mg_fs *fs;       // FS API for reading certificate files
 };
 
-struct mg_dns_resource_record *mg_dns_next_record(
-    struct mg_dns_message *msg, int query, struct mg_dns_resource_record *prev);
-
-/*
- * Parses the record data from a DNS resource record.
- *
- *  - A:     struct in_addr *ina
- *  - AAAA:  struct in6_addr *ina
- *  - CNAME: char buffer
- *
- * Returns -1 on error.
- *
- * TODO(mkm): MX
- */
-int mg_dns_parse_record_data(struct mg_dns_message *msg,
-                             struct mg_dns_resource_record *rr, void *data,
-                             size_t data_len);
-
-/*
- * Sends a DNS query to the remote end.
- */
-void mg_send_dns_query(struct mg_connection *nc, const char *name,
-                       int query_type);
-
-/*
- * Inserts a DNS header to an IO buffer.
- *
- * Returns the number of bytes inserted.
- */
-int mg_dns_insert_header(struct mbuf *io, size_t pos,
-                         struct mg_dns_message *msg);
-
-/*
- * Appends already encoded questions from an existing message.
- *
- * This is useful when generating a DNS reply message which includes
- * all question records.
- *
- * Returns the number of appended bytes.
- */
-int mg_dns_copy_questions(struct mbuf *io, struct mg_dns_message *msg);
-
-/*
- * Encodes and appends a DNS resource record to an IO buffer.
- *
- * The record metadata is taken from the `rr` parameter, while the name and data
- * are taken from the parameters, encoded in the appropriate format depending on
- * record type and stored in the IO buffer. The encoded values might contain
- * offsets within the IO buffer. It's thus important that the IO buffer doesn't
- * get trimmed while a sequence of records are encoded while preparing a DNS
- * reply.
- *
- * This function doesn't update the `name` and `rdata` pointers in the `rr`
- * struct because they might be invalidated as soon as the IO buffer grows
- * again.
- *
- * Returns the number of bytes appended or -1 in case of error.
- */
-int mg_dns_encode_record(struct mbuf *io, struct mg_dns_resource_record *rr,
-                         const char *name, size_t nlen, const void *rdata,
-                         size_t rlen);
-
-/*
- * Encodes a DNS name.
- */
-int mg_dns_encode_name(struct mbuf *io, const char *name, size_t len);
-int mg_dns_encode_name_s(struct mbuf *io, struct mg_str name);
-
-/* Low-level: parses a DNS response. */
-int mg_parse_dns(const char *buf, int len, struct mg_dns_message *msg);
-
-/*
- * Uncompresses a DNS compressed name.
- *
- * The containing DNS message is required because of the compressed encoding
- * and reference suffixes present elsewhere in the packet.
- *
- * If the name is less than `dst_len` characters long, the remainder
- * of `dst` is terminated with `\0` characters. Otherwise, `dst` is not
- * terminated.
- *
- * If `dst_len` is 0 `dst` can be NULL.
- * Returns the uncompressed name length.
- */
-size_t mg_dns_uncompress_name(struct mg_dns_message *msg, struct mg_str *name,
-                              char *dst, int dst_len);
-
-/*
- * Attaches a built-in DNS event handler to the given listening connection.
- *
- * The DNS event handler parses the incoming UDP packets, treating them as DNS
- * requests. If an incoming packet gets successfully parsed by the DNS event
- * handler, a user event handler will receive an `MG_DNS_REQUEST` event, with
- * `ev_data` pointing to the parsed `struct mg_dns_message`.
- *
- * See
- * [captive_dns_server](https://github.com/cesanta/mongoose/tree/master/examples/captive_dns_server)
- * example on how to handle DNS request and send DNS reply.
- */
-void mg_set_protocol_dns(struct mg_connection *nc);
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* CS_MONGOOSE_SRC_DNS_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_dns_server.h"
-#endif
+void mg_tls_init(struct mg_connection *, struct mg_tls_opts *);
+void mg_tls_free(struct mg_connection *);
+long mg_tls_send(struct mg_connection *, const void *buf, size_t len);
+long mg_tls_recv(struct mg_connection *, void *buf, size_t len);
+void mg_tls_handshake(struct mg_connection *);
 
-/*
- * === DNS server API reference
- *
- * Disabled by default; enable with `-DMG_ENABLE_DNS_SERVER`.
- */
 
-#ifndef CS_MONGOOSE_SRC_DNS_SERVER_H_
-#define CS_MONGOOSE_SRC_DNS_SERVER_H_
+#if MG_ENABLE_MBEDTLS
 
-#if MG_ENABLE_DNS_SERVER
 
-/* Amalgamated: #include "mg_dns.h" */
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
 
-#define MG_DNS_SERVER_DEFAULT_TTL 3600
+#include <mbedtls/debug.h>
+#include <mbedtls/net_sockets.h>
+#include <mbedtls/ssl.h>
 
-struct mg_dns_reply {
-  struct mg_dns_message *msg;
-  struct mbuf *io;
-  size_t start;
+struct mg_tls {
+  char *cafile;             // CA certificate path
+  mbedtls_x509_crt ca;      // Parsed CA certificate
+  mbedtls_x509_crl crl;     // Parsed Certificate Revocation List
+  mbedtls_x509_crt cert;    // Parsed certificate
+  mbedtls_ssl_context ssl;  // SSL/TLS context
+  mbedtls_ssl_config conf;  // SSL-TLS config
+  mbedtls_pk_context pk;    // Private key context
 };
-
-/*
- * Creates a DNS reply.
- *
- * The reply will be based on an existing query message `msg`.
- * The query body will be appended to the output buffer.
- * "reply + recursion allowed" will be added to the message flags and the
- * message's num_answers will be set to 0.
- *
- * Answer records can be appended with `mg_dns_send_reply` or by lower
- * level function defined in the DNS API.
- *
- * In order to send a reply use `mg_dns_send_reply`.
- * It's possible to use a connection's send buffer as reply buffer,
- * and it will work for both UDP and TCP connections.
- *
- * Example:
- *
- * ```c
- * reply = mg_dns_create_reply(&nc->send_mbuf, msg);
- * for (i = 0; i < msg->num_questions; i++) {
- *   rr = &msg->questions[i];
- *   if (rr->rtype == MG_DNS_A_RECORD) {
- *     mg_dns_reply_record(&reply, rr, 3600, &dummy_ip_addr, 4);
- *   }
- * }
- * mg_dns_send_reply(nc, &reply);
- * ```
- */
-struct mg_dns_reply mg_dns_create_reply(struct mbuf *io,
-                                        struct mg_dns_message *msg);
-
-/*
- * Appends a DNS reply record to the IO buffer and to the DNS message.
- *
- * The message's num_answers field will be incremented. It's the caller's duty
- * to ensure num_answers is properly initialised.
- *
- * Returns -1 on error.
- */
-int mg_dns_reply_record(struct mg_dns_reply *reply,
-                        struct mg_dns_resource_record *question,
-                        const char *name, int rtype, int ttl, const void *rdata,
-                        size_t rdata_len);
-
-/*
- * Sends a DNS reply through a connection.
- *
- * The DNS data is stored in an IO buffer pointed by reply structure in `r`.
- * This function mutates the content of that buffer in order to ensure that
- * the DNS header reflects the size and flags of the message, that might have
- * been updated either with `mg_dns_reply_record` or by direct manipulation of
- * `r->message`.
- *
- * Once sent, the IO buffer will be trimmed unless the reply IO buffer
- * is the connection's send buffer and the connection is not in UDP mode.
- */
-void mg_dns_send_reply(struct mg_connection *nc, struct mg_dns_reply *r);
-
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-
-#endif /* MG_ENABLE_DNS_SERVER */
-#endif /* CS_MONGOOSE_SRC_DNS_SERVER_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_resolv.h"
 #endif
 
-/*
- * === API reference
- */
 
-#ifndef CS_MONGOOSE_SRC_RESOLV_H_
-#define CS_MONGOOSE_SRC_RESOLV_H_
+#if MG_ENABLE_OPENSSL
 
-/* Amalgamated: #include "mg_dns.h" */
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
+#include <openssl/err.h>
+#include <openssl/ssl.h>
 
-enum mg_resolve_err {
-  MG_RESOLVE_OK = 0,
-  MG_RESOLVE_NO_ANSWERS = 1,
-  MG_RESOLVE_EXCEEDED_RETRY_COUNT = 2,
-  MG_RESOLVE_TIMEOUT = 3
+struct mg_tls {
+  SSL_CTX *ctx;
+  SSL *ssl;
 };
+#endif
 
-typedef void (*mg_resolve_callback_t)(struct mg_dns_message *dns_message,
-                                      void *user_data, enum mg_resolve_err);
-
-/* Options for `mg_resolve_async_opt`. */
-struct mg_resolve_async_opts {
-  const char *nameserver;
-  int max_retries;    /* defaults to 2 if zero */
-  int timeout;        /* in seconds; defaults to 5 if zero */
-  int accept_literal; /* pseudo-resolve literal ipv4 and ipv6 addrs */
-  int only_literal;   /* only resolves literal addrs; sync cb invocation */
-  struct mg_connection **dns_conn; /* return DNS connection */
-};
 
-/* See `mg_resolve_async_opt()` */
-int mg_resolve_async(struct mg_mgr *mgr, const char *name, int query,
-                     mg_resolve_callback_t cb, void *data);
-
-/* Set default DNS server */
-void mg_set_nameserver(struct mg_mgr *mgr, const char *nameserver);
-
-/*
- * Resolved a DNS name asynchronously.
- *
- * Upon successful resolution, the user callback will be invoked
- * with the full DNS response message and a pointer to the user's
- * context `data`.
- *
- * In case of timeout while performing the resolution the callback
- * will receive a NULL `msg`.
- *
- * The DNS answers can be extracted with `mg_next_record` and
- * `mg_dns_parse_record_data`:
- *
- * [source,c]
- * ----
- * struct in_addr ina;
- * struct mg_dns_resource_record *rr = mg_next_record(msg, MG_DNS_A_RECORD,
- *   NULL);
- * mg_dns_parse_record_data(msg, rr, &ina, sizeof(ina));
- * ----
- */
-int mg_resolve_async_opt(struct mg_mgr *mgr, const char *name, int query,
-                         mg_resolve_callback_t cb, void *data,
-                         struct mg_resolve_async_opts opts);
-
-/*
- * Resolve a name from `/etc/hosts`.
- *
- * Returns 0 on success, -1 on failure.
- */
-int mg_resolve_from_hosts_file(const char *host, union socket_address *usa);
+#define WEBSOCKET_OP_CONTINUE 0
+#define WEBSOCKET_OP_TEXT 1
+#define WEBSOCKET_OP_BINARY 2
+#define WEBSOCKET_OP_CLOSE 8
+#define WEBSOCKET_OP_PING 9
+#define WEBSOCKET_OP_PONG 10
 
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
-#endif /* CS_MONGOOSE_SRC_RESOLV_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_coap.h"
-#endif
 
-/*
- * === CoAP API reference
- *
- * CoAP message format:
- *
- * ```
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * |Ver| T | TKL | Code | Message ID | Token (if any, TKL bytes) ...
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * | Options (if any) ...            |1 1 1 1 1 1 1 1| Payload (if any) ...
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * ```
- */
-
-#ifndef CS_MONGOOSE_SRC_COAP_H_
-#define CS_MONGOOSE_SRC_COAP_H_
-
-#if MG_ENABLE_COAP
-
-#define MG_COAP_MSG_TYPE_FIELD 0x2
-#define MG_COAP_CODE_CLASS_FIELD 0x4
-#define MG_COAP_CODE_DETAIL_FIELD 0x8
-#define MG_COAP_MSG_ID_FIELD 0x10
-#define MG_COAP_TOKEN_FIELD 0x20
-#define MG_COAP_OPTIOMG_FIELD 0x40
-#define MG_COAP_PAYLOAD_FIELD 0x80
-
-#define MG_COAP_ERROR 0x10000
-#define MG_COAP_FORMAT_ERROR (MG_COAP_ERROR | 0x20000)
-#define MG_COAP_IGNORE (MG_COAP_ERROR | 0x40000)
-#define MG_COAP_NOT_ENOUGH_DATA (MG_COAP_ERROR | 0x80000)
-#define MG_COAP_NETWORK_ERROR (MG_COAP_ERROR | 0x100000)
-
-#define MG_COAP_MSG_CON 0
-#define MG_COAP_MSG_NOC 1
-#define MG_COAP_MSG_ACK 2
-#define MG_COAP_MSG_RST 3
-#define MG_COAP_MSG_MAX 3
-
-#define MG_COAP_CODECLASS_REQUEST 0
-#define MG_COAP_CODECLASS_RESP_OK 2
-#define MG_COAP_CODECLASS_CLIENT_ERR 4
-#define MG_COAP_CODECLASS_SRV_ERR 5
-
-#define MG_COAP_EVENT_BASE 300
-#define MG_EV_COAP_CON (MG_COAP_EVENT_BASE + MG_COAP_MSG_CON)
-#define MG_EV_COAP_NOC (MG_COAP_EVENT_BASE + MG_COAP_MSG_NOC)
-#define MG_EV_COAP_ACK (MG_COAP_EVENT_BASE + MG_COAP_MSG_ACK)
-#define MG_EV_COAP_RST (MG_COAP_EVENT_BASE + MG_COAP_MSG_RST)
-
-/*
- * CoAP options.
- * Use mg_coap_add_option and mg_coap_free_options
- * for creation and destruction.
- */
-struct mg_coap_option {
-  struct mg_coap_option *next;
-  uint32_t number;
-  struct mg_str value;
-};
 
-/* CoAP message. See RFC 7252 for details. */
-struct mg_coap_message {
-  uint32_t flags;
-  uint8_t msg_type;
-  uint8_t code_class;
-  uint8_t code_detail;
-  uint16_t msg_id;
-  struct mg_str token;
-  struct mg_coap_option *options;
-  struct mg_str payload;
-  struct mg_coap_option *optiomg_tail;
+struct mg_ws_message {
+  struct mg_str data;  // Websocket message data
+  uint8_t flags;       // Websocket message flags
 };
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/* Sets CoAP protocol handler - triggers CoAP specific events. */
-int mg_set_protocol_coap(struct mg_connection *nc);
-
-/*
- * Adds a new option to mg_coap_message structure.
- * Returns pointer to the newly created option.
- * Note: options must be freed by using mg_coap_free_options
- */
-struct mg_coap_option *mg_coap_add_option(struct mg_coap_message *cm,
-                                          uint32_t number, char *value,
-                                          size_t len);
-
-/*
- * Frees the memory allocated for options.
- * If the cm parameter doesn't contain any option it does nothing.
- */
-void mg_coap_free_options(struct mg_coap_message *cm);
-
-/*
- * Composes a CoAP message from `mg_coap_message`
- * and sends it into `nc` connection.
- * Returns 0 on success. On error, it is a bitmask:
- *
- * - `#define MG_COAP_ERROR 0x10000`
- * - `#define MG_COAP_FORMAT_ERROR (MG_COAP_ERROR | 0x20000)`
- * - `#define MG_COAP_IGNORE (MG_COAP_ERROR | 0x40000)`
- * - `#define MG_COAP_NOT_ENOUGH_DATA (MG_COAP_ERROR | 0x80000)`
- * - `#define MG_COAP_NETWORK_ERROR (MG_COAP_ERROR | 0x100000)`
- */
-uint32_t mg_coap_send_message(struct mg_connection *nc,
-                              struct mg_coap_message *cm);
-
-/*
- * Composes CoAP acknowledgement from `mg_coap_message`
- * and sends it into `nc` connection.
- * Return value: see `mg_coap_send_message()`
- */
-uint32_t mg_coap_send_ack(struct mg_connection *nc, uint16_t msg_id);
-
-/*
- * Parses CoAP message and fills mg_coap_message and returns cm->flags.
- * This is a helper function.
- *
- * NOTE: usually CoAP works over UDP, so lack of data means format error.
- * But, in theory, it is possible to use CoAP over TCP (according to RFC)
- *
- * The caller has to check results and treat COAP_NOT_ENOUGH_DATA according to
- * underlying protocol:
- *
- * - in case of UDP COAP_NOT_ENOUGH_DATA means COAP_FORMAT_ERROR,
- * - in case of TCP client can try to receive more data
- *
- * Return value: see `mg_coap_send_message()`
- */
-uint32_t mg_coap_parse(struct mbuf *io, struct mg_coap_message *cm);
-
-/*
- * Composes CoAP message from mg_coap_message structure.
- * This is a helper function.
- * Return value: see `mg_coap_send_message()`
- */
-uint32_t mg_coap_compose(struct mg_coap_message *cm, struct mbuf *io);
+struct mg_connection *mg_ws_connect(struct mg_mgr *, const char *url,
+                                    mg_event_handler_t fn, void *fn_data,
+                                    const char *fmt, ...);
+void mg_ws_upgrade(struct mg_connection *, struct mg_http_message *,
+                   const char *fmt, ...);
+size_t mg_ws_send(struct mg_connection *, const char *buf, size_t len, int op);
+size_t mg_ws_wrap(struct mg_connection *, size_t len, int op);
 
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
 
-#endif /* MG_ENABLE_COAP */
 
-#endif /* CS_MONGOOSE_SRC_COAP_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_sntp.h"
-#endif
 
-#ifndef CS_MONGOOSE_SRC_SNTP_H_
-#define CS_MONGOOSE_SRC_SNTP_H_
+struct mg_connection *mg_sntp_connect(struct mg_mgr *mgr, const char *url,
+                                      mg_event_handler_t fn, void *fn_data);
+void mg_sntp_send(struct mg_connection *c, unsigned long utc);
+int64_t mg_sntp_parse(const unsigned char *buf, size_t len);
 
-#if MG_ENABLE_SNTP
 
-#define MG_SNTP_EVENT_BASE 500
 
-/*
- * Received reply from time server. Event handler parameter contains
- * pointer to mg_sntp_message structure
- */
-#define MG_SNTP_REPLY (MG_SNTP_EVENT_BASE + 1)
 
-/* Received malformed SNTP packet */
-#define MG_SNTP_MALFORMED_REPLY (MG_SNTP_EVENT_BASE + 2)
 
-/* Failed to get time from server (timeout etc) */
-#define MG_SNTP_FAILED (MG_SNTP_EVENT_BASE + 3)
+#define MQTT_CMD_CONNECT 1
+#define MQTT_CMD_CONNACK 2
+#define MQTT_CMD_PUBLISH 3
+#define MQTT_CMD_PUBACK 4
+#define MQTT_CMD_PUBREC 5
+#define MQTT_CMD_PUBREL 6
+#define MQTT_CMD_PUBCOMP 7
+#define MQTT_CMD_SUBSCRIBE 8
+#define MQTT_CMD_SUBACK 9
+#define MQTT_CMD_UNSUBSCRIBE 10
+#define MQTT_CMD_UNSUBACK 11
+#define MQTT_CMD_PINGREQ 12
+#define MQTT_CMD_PINGRESP 13
+#define MQTT_CMD_DISCONNECT 14
 
-struct mg_sntp_message {
-  /* if server sends this flags, user should not send requests to it */
-  int kiss_of_death;
-  /* usual mg_time */
-  double time;
+struct mg_mqtt_opts {
+  struct mg_str user;          // Username, can be empty
+  struct mg_str pass;          // Password, can be empty
+  struct mg_str client_id;     // Client ID
+  struct mg_str will_topic;    // Will topic
+  struct mg_str will_message;  // Will message
+  uint8_t will_qos;            // Will message quality of service
+  bool will_retain;            // Retain last will
+  bool clean;                  // Use clean session, 0 or 1
+  uint16_t keepalive;          // Keep-alive timer in seconds
 };
 
-/* Establishes connection to given sntp server */
-struct mg_connection *mg_sntp_connect(struct mg_mgr *mgr,
-                                      MG_CB(mg_event_handler_t event_handler,
-                                            void *user_data),
-                                      const char *sntp_server_name);
-
-/* Sends time request to given connection */
-void mg_sntp_send_request(struct mg_connection *c);
-
-/*
- * Helper function
- * Establishes connection to time server, tries to send request
- * repeats sending SNTP_ATTEMPTS times every SNTP_TIMEOUT sec
- * (if needed)
- * See sntp_client example
- */
-struct mg_connection *mg_sntp_get_time(struct mg_mgr *mgr,
-                                       mg_event_handler_t event_handler,
-                                       const char *sntp_server_name);
-
-#endif
-
-#endif /* CS_MONGOOSE_SRC_SNTP_H_ */
-#ifdef MG_MODULE_LINES
-#line 1 "mongoose/src/mg_socks.h"
-#endif
-
-#ifndef CS_MONGOOSE_SRC_SOCKS_H_
-#define CS_MONGOOSE_SRC_SOCKS_H_
-
-#if MG_ENABLE_SOCKS
-
-#define MG_SOCKS_VERSION 5
-
-#define MG_SOCKS_HANDSHAKE_DONE MG_F_USER_1
-#define MG_SOCKS_CONNECT_DONE MG_F_USER_2
-
-/* SOCKS5 handshake methods */
-enum mg_socks_handshake_method {
-  MG_SOCKS_HANDSHAKE_NOAUTH = 0,     /* Handshake method - no authentication */
-  MG_SOCKS_HANDSHAKE_GSSAPI = 1,     /* Handshake method - GSSAPI auth */
-  MG_SOCKS_HANDSHAKE_USERPASS = 2,   /* Handshake method - user/password auth */
-  MG_SOCKS_HANDSHAKE_FAILURE = 0xff, /* Handshake method - failure */
+struct mg_mqtt_message {
+  struct mg_str topic;  // Parsed topic
+  struct mg_str data;   // Parsed message
+  struct mg_str dgram;  // Whole MQTT datagram, including headers
+  uint16_t id;  // Set for PUBACK, PUBREC, PUBREL, PUBCOMP, SUBACK, PUBLISH
+  uint8_t cmd;  // MQTT command, one of MQTT_CMD_*
+  uint8_t qos;  // Quality of service
+  uint8_t ack;  // Connack return code. 0 - success
 };
 
-/* SOCKS5 commands */
-enum mg_socks_command {
-  MG_SOCKS_CMD_CONNECT = 1,       /* Command: CONNECT */
-  MG_SOCKS_CMD_BIND = 2,          /* Command: BIND */
-  MG_SOCKS_CMD_UDP_ASSOCIATE = 3, /* Command: UDP ASSOCIATE */
+struct mg_connection *mg_mqtt_connect(struct mg_mgr *, const char *url,
+                                      struct mg_mqtt_opts *opts,
+                                      mg_event_handler_t fn, void *fn_data);
+struct mg_connection *mg_mqtt_listen(struct mg_mgr *mgr, const char *url,
+                                     mg_event_handler_t fn, void *fn_data);
+void mg_mqtt_login(struct mg_connection *c, struct mg_mqtt_opts *opts);
+void mg_mqtt_pub(struct mg_connection *c, struct mg_str topic,
+                 struct mg_str data, int qos, bool retain);
+void mg_mqtt_sub(struct mg_connection *, struct mg_str topic, int qos);
+int mg_mqtt_parse(const uint8_t *buf, size_t len, struct mg_mqtt_message *m);
+void mg_mqtt_send_header(struct mg_connection *, uint8_t cmd, uint8_t flags,
+                         uint32_t len);
+size_t mg_mqtt_next_sub(struct mg_mqtt_message *msg, struct mg_str *topic,
+                        uint8_t *qos, size_t pos);
+size_t mg_mqtt_next_unsub(struct mg_mqtt_message *msg, struct mg_str *topic,
+                          size_t pos);
+void mg_mqtt_ping(struct mg_connection *);
+void mg_mqtt_pong(struct mg_connection *);
+void mg_mqtt_disconnect(struct mg_connection *);
+
+
+
+
+
+// Mongoose sends DNS queries that contain only one question:
+// either A (IPv4) or AAAA (IPv6) address lookup.
+// Therefore, we expect zero or one answer.
+// If `resolved` is true, then `addr` contains resolved IPv4 or IPV6 address.
+struct mg_dns_message {
+  uint16_t txnid;       // Transaction ID
+  bool resolved;        // Resolve successful, addr is set
+  struct mg_addr addr;  // Resolved address
+  char name[256];       // Host name
 };
 
-/* SOCKS5 address types */
-enum mg_socks_address_type {
-  MG_SOCKS_ADDR_IPV4 = 1,   /* Address type: IPv4 */
-  MG_SOCKS_ADDR_DOMAIN = 3, /* Address type: Domain name */
-  MG_SOCKS_ADDR_IPV6 = 4,   /* Address type: IPv6 */
+struct mg_dns_header {
+  uint16_t txnid;  // Transaction ID
+  uint16_t flags;
+  uint16_t num_questions;
+  uint16_t num_answers;
+  uint16_t num_authority_prs;
+  uint16_t num_other_prs;
 };
 
-/* SOCKS5 response codes */
-enum mg_socks_response {
-  MG_SOCKS_SUCCESS = 0,            /* Response: success */
-  MG_SOCKS_FAILURE = 1,            /* Response: failure */
-  MG_SOCKS_NOT_ALLOWED = 2,        /* Response: connection not allowed */
-  MG_SOCKS_NET_UNREACHABLE = 3,    /* Response: network unreachable */
-  MG_SOCKS_HOST_UNREACHABLE = 4,   /* Response: network unreachable */
-  MG_SOCKS_CONN_REFUSED = 5,       /* Response: network unreachable */
-  MG_SOCKS_TTL_EXPIRED = 6,        /* Response: network unreachable */
-  MG_SOCKS_CMD_NOT_SUPPORTED = 7,  /* Response: network unreachable */
-  MG_SOCKS_ADDR_NOT_SUPPORTED = 8, /* Response: network unreachable */
+// DNS resource record
+struct mg_dns_rr {
+  uint16_t nlen;    // Name or pointer length
+  uint16_t atype;   // Address type
+  uint16_t aclass;  // Address class
+  uint16_t alen;    // Address length
 };
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
-/* Turn the connection into the SOCKS server */
-void mg_set_protocol_socks(struct mg_connection *c);
-
-/* Create socks tunnel for the client connection */
-struct mg_iface *mg_socks_mk_iface(struct mg_mgr *, const char *proxy_addr);
+void mg_resolve(struct mg_connection *, const char *url);
+void mg_resolve_cancel(struct mg_connection *);
+bool mg_dns_parse(const uint8_t *buf, size_t len, struct mg_dns_message *);
+size_t mg_dns_parse_rr(const uint8_t *buf, size_t len, size_t ofs,
+                       bool is_question, struct mg_dns_rr *);
+size_t mg_dns_decode_name(const uint8_t *, size_t, size_t, char *, size_t);
 
 #ifdef __cplusplus
 }
-#endif /* __cplusplus */
-
-#endif
 #endif
+#endif  // MONGOOSE_H

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From: James Hilliard <james.hilliard1@gmail.com>
To: swupdate@googlegroups.com
Cc: James Hilliard <james.hilliard1@gmail.com>
Subject: [swupdate] [PATCH v8 2/3] mongoose: Adapt interface for mongoose 7.6
Date: Thu, 17 Feb 2022 18:27:17 -0700
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There are significant differences in the new mongoose API which
requires significant changes to the interface to support.

We need to forward-port mongoose digest auth support as it is no
longer built into mongoose.

We also need to forward port multipart stream handling.

We need to overhaul the broadcast thread handling as the current
implementation is not thread safe and can drop messages.

Note that mongoose.c and mongoose.h are unmodified from the upstream
amalgamations to simplify review, there are a few warnings that
probably need to be fixed there.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
---
Changes v7 -> v8:
  - initialize url to NULL
  - multipart stream handler cleanup
  - pipe websocket messages to broadcast callback with mg_mgr_wakeup
Changes v6 -> v7:
  - fix potential use after free in port/url parser
  - multipart handler cleanup
Changes v5 -> v6:
  - fix port parser
  - add timer
Changes v4 -> v5:
  - update to mongoose 7.6
  - rebase/cleanup
Changes v3 -> v4:
  - size computation fixes
  - broadcast download progress
Changes v2 -> v3:
  - forward port multipart streaming handler
---
 mongoose/Makefile             |  10 +-
 mongoose/mongoose_interface.c | 660 ++++++++++++++++++++++++----------
 mongoose/mongoose_multipart.c | 336 +++++++++++++++++
 mongoose/mongoose_multipart.h |  48 +++
 4 files changed, 855 insertions(+), 199 deletions(-)
 create mode 100644 mongoose/mongoose_multipart.c
 create mode 100644 mongoose/mongoose_multipart.h

diff --git a/mongoose/Makefile b/mongoose/Makefile
index a6711a2..7dd9f73 100644
--- a/mongoose/Makefile
+++ b/mongoose/Makefile
@@ -6,20 +6,24 @@ ifneq ($(CONFIG_WEBSERVER),)
 ifneq ($(CONFIG_MONGOOSE),)
 KBUILD_CFLAGS += -DMG_ENABLE_HTTP_STREAMING_MULTIPART=1
 KBUILD_CFLAGS += -DMG_ENABLE_HTTP_WEBSOCKET=1 -DMG_ENABLE_THREADS=1
+KBUILD_CFLAGS += -DMG_ENABLE_MD5=1
+KBUILD_CFLAGS += -DMG_MAX_RECV_BUF_SIZE=262144
+KBUILD_CFLAGS += -DMG_ENABLE_LOG=0
 ifneq ($(CONFIG_MONGOOSEIPV6),)
 KBUILD_CFLAGS += -DMG_ENABLE_IPV6=1
 endif
 ifneq ($(CONFIG_MONGOOSESSL),)
 KBUILD_CFLAGS += -DMG_ENABLE_SSL=1
+endif
 ifeq ($(CONFIG_SSL_IMPL_OPENSSL)$(CONFIG_SSL_IMPL_WOLFSSL),y)
-KBUILD_CFLAGS += -DMG_SSL_IF=MG_SSL_IF_OPENSSL
+KBUILD_CFLAGS += -DMG_ENABLE_OPENSSL=1
 endif
 ifeq ($(CONFIG_SSL_IMPL_MBEDTLS),y)
-KBUILD_CFLAGS += -DMG_SSL_IF=MG_SSL_IF_MBEDTLS
-endif
+KBUILD_CFLAGS += -DMG_ENABLE_MBEDTLS=1
 endif
 endif
 endif
 
 lib-$(CONFIG_MONGOOSE)	+= mongoose.o \
+			   mongoose_multipart.o \
 			   mongoose_interface.o
diff --git a/mongoose/mongoose_interface.c b/mongoose/mongoose_interface.c
index 930cbf3..30d9dfa 100644
--- a/mongoose/mongoose_interface.c
+++ b/mongoose/mongoose_interface.c
@@ -26,17 +26,16 @@
 #include <parselib.h>
 #include <progress_ipc.h>
 #include <swupdate_settings.h>
-#include <time.h>
+#include <pctl.h>
+#include <progress.h>
 
 #include "mongoose.h"
+#include "mongoose_multipart.h"
 #include "util.h"
 
 #define MG_PORT "8080"
 #define MG_ROOT "."
 
-/* in seconds. If no packet is received with this timeout, connection is broken */
-#define MG_TIMEOUT	120
-
 struct mongoose_options {
 	char *root;
 	bool listing;
@@ -53,12 +52,244 @@ struct file_upload_state {
 	size_t len;
 	int fd;
 	bool error_report; /* if set, stop to flood with errors */
+	uint8_t percent;
+	struct mg_timer timer;
+	int64_t last_io_time;
 };
 
 static bool run_postupdate;
 static unsigned int watchdog_conn = 0;
-static struct mg_serve_http_opts s_http_server_opts;
-static void upload_handler(struct mg_connection *nc, int ev, void *p);
+static struct mg_http_serve_opts s_http_server_opts;
+const char *global_auth_domain;
+const char *global_auth_file;
+#if MG_ENABLE_SSL
+static bool ssl;
+static struct mg_tls_opts tls_opts;
+#endif
+
+static struct mg_connection *ws_pipe;
+
+static int s_signo = 0;
+static void signal_handler(int signo) {
+	s_signo = signo;
+}
+
+static int p_stat(const char *path, size_t *size, time_t *mtime)
+{
+	int flags = mg_fs_posix.stat(path, size, mtime);
+	if (flags & MG_FS_DIR && strcmp(s_http_server_opts.root_dir, path) != 0)
+		return 0;
+	return flags;
+}
+
+static void p_list(const char *path, void (*fn)(const char *, void *), void *userdata)
+{
+	(void) path, (void) fn, (void) userdata;
+}
+
+static void *p_open(const char *path, int flags)
+{
+	return mg_fs_posix.open(path, flags);
+}
+
+static void p_close(void *fp)
+{
+	return mg_fs_posix.close(fp);
+}
+
+static size_t p_read(void *fd, void *buf, size_t len)
+{
+	return mg_fs_posix.read(fd, buf, len);
+}
+
+static size_t p_write(void *fd, const void *buf, size_t len)
+{
+	return mg_fs_posix.write(fd, buf, len);
+}
+
+static size_t p_seek(void *fd, size_t offset)
+{
+	return mg_fs_posix.seek(fd, offset);
+}
+
+static bool p_rename(const char *from, const char *to)
+{
+	return mg_fs_posix.rename(from, to);
+}
+
+static bool p_remove(const char *path)
+{
+	return mg_fs_posix.remove(path);
+}
+
+static bool p_mkdir(const char *path)
+{
+	return mg_fs_posix.mkd(path);
+}
+
+/* mg_fs which inhibits directory listing functionality */
+static struct mg_fs fs_posix_no_list = {
+		p_stat,
+		p_list,
+		p_open,
+		p_close,
+		p_read,
+		p_write,
+		p_seek,
+		p_rename,
+		p_remove,
+		p_mkdir
+};
+
+/*
+ * Minimal forward port of mongoose digest auth support.
+ */
+static void mg_hash_md5_v(size_t num_msgs, const uint8_t *msgs[],
+				   const size_t *msg_lens, uint8_t *digest)
+{
+	size_t i;
+	mg_md5_ctx md5_ctx;
+	mg_md5_init(&md5_ctx);
+	for (i = 0; i < num_msgs; i++) {
+		mg_md5_update(&md5_ctx, msgs[i], msg_lens[i]);
+	}
+	mg_md5_final(&md5_ctx, digest);
+}
+
+static void cs_md5(char buf[33], ...)
+{
+	unsigned char hash[16];
+	const uint8_t *msgs[20], *p;
+	size_t msg_lens[20];
+	size_t num_msgs = 0;
+	va_list ap;
+
+	va_start(ap, buf);
+	while ((p = va_arg(ap, const unsigned char *)) != NULL) {
+		msgs[num_msgs] = p;
+		msg_lens[num_msgs] = va_arg(ap, size_t);
+		num_msgs++;
+	}
+	va_end(ap);
+
+	mg_hash_md5_v(num_msgs, msgs, msg_lens, hash);
+	mg_hex(hash, sizeof(hash), buf);
+}
+
+static void mg_mkmd5resp(struct mg_str method, struct mg_str uri, struct mg_str ha1,
+						 struct mg_str nonce, struct mg_str nc, struct mg_str cnonce,
+						 struct mg_str qop, char *resp)
+{
+	static const char colon[] = ":";
+	static const size_t one = 1;
+	char ha2[33];
+	cs_md5(ha2, method.ptr, method.len, colon, one, uri.ptr, uri.len, NULL);
+	cs_md5(resp, ha1.ptr, ha1.len, colon, one, nonce.ptr, nonce.len, colon, one, nc.ptr,
+		   nc.len, colon, one, cnonce.ptr, cnonce.len, colon, one, qop.ptr, qop.len,
+		   colon, one, ha2, sizeof(ha2) - 1, NULL);
+}
+
+static double mg_time(void)
+{
+	struct timeval tv;
+	if (gettimeofday(&tv, NULL /* tz */) != 0) return 0;
+	return (double) tv.tv_sec + (((double) tv.tv_usec) / 1000000.0);
+}
+
+/*
+ * Check for authentication timeout.
+ * Clients send time stamp encoded in nonce. Make sure it is not too old,
+ * to prevent replay attacks.
+ * Assumption: nonce is a hexadecimal number of seconds since 1970.
+ */
+static int mg_check_nonce(struct mg_str nonce)
+{
+	unsigned long now = (unsigned long) mg_time();
+	unsigned long val = (unsigned long) strtoul(nonce.ptr, NULL, 16);
+	return (now >= val) && (now - val < 60 * 60);
+}
+
+static int mg_check_digest_auth(struct mg_str method, struct mg_str uri,
+						 struct mg_str username, struct mg_str cnonce,
+						 struct mg_str response, struct mg_str qop,
+						 struct mg_str nc, struct mg_str nonce,
+						 struct mg_str auth_domain, FILE *fp)
+{
+	char buf[128], f_user[sizeof(buf)], f_ha1[sizeof(buf)], f_domain[sizeof(buf)];
+	char exp_resp[33];
+
+	/*
+	 * Read passwords file line by line. If should have htdigest format,
+	 * i.e. each line should be a colon-separated sequence:
+	 * USER_NAME:DOMAIN_NAME:HA1_HASH_OF_USER_DOMAIN_AND_PASSWORD
+	 */
+	while (fgets(buf, sizeof(buf), fp) != NULL) {
+		if (sscanf(buf, "%[^:]:%[^:]:%s", f_user, f_domain, f_ha1) == 3 &&
+			mg_vcmp(&username, f_user) == 0 &&
+			mg_vcmp(&auth_domain, f_domain) == 0) {
+			/* Username and domain matched, check the password */
+			mg_mkmd5resp(method, uri, mg_str_s(f_ha1), nonce, nc, cnonce, qop, exp_resp);
+			return mg_ncasecmp(response.ptr, exp_resp, strlen(exp_resp)) == 0;
+		}
+	}
+
+	/* None of the entries in the passwords file matched - return failure */
+	return 0;
+}
+
+static int mg_http_check_digest_auth(struct mg_http_message *hm, struct mg_str auth_domain, FILE *fp)
+{
+	struct mg_str *hdr;
+	struct mg_str username, cnonce, response, qop, nc, nonce;
+
+	/* Parse "Authorization:" header, fail fast on parse error */
+	if (hm == NULL ||
+		(hdr = mg_http_get_header(hm, "Authorization")) == NULL ||
+		(username = mg_http_get_header_var(*hdr, mg_str_n("username", 8))).len == 0 ||
+		(cnonce = mg_http_get_header_var(*hdr, mg_str_n("cnonce", 6))).len == 0 ||
+		(response = mg_http_get_header_var(*hdr, mg_str_n("response", 8))).len == 0 ||
+		mg_http_get_header_var(*hdr, mg_str_n("uri", 3)).len == 0 ||
+		(qop = mg_http_get_header_var(*hdr, mg_str_n("qop", 3))).len == 0 ||
+		(nc = mg_http_get_header_var(*hdr, mg_str_n("nc", 2))).len == 0 ||
+		(nonce = mg_http_get_header_var(*hdr, mg_str_n("nonce", 5))).len == 0 ||
+		mg_check_nonce(nonce) == 0) {
+		return 0;
+	}
+
+	/* NOTE(lsm): due to a bug in MSIE, we do not compare URIs */
+
+	return mg_check_digest_auth(
+			hm->method,
+			mg_str_n(
+					hm->uri.ptr,
+					hm->uri.len + (hm->query.len ? hm->query.len + 1 : 0)),
+			username, cnonce, response, qop, nc, nonce, auth_domain, fp);
+}
+
+static int mg_http_is_authorized(struct mg_http_message *hm, const char *domain, const char *passwords_file) {
+	FILE *fp;
+	int authorized = 1;
+
+	if (domain != NULL && passwords_file != NULL) {
+		fp = fopen(passwords_file, "r");
+		if (fp != NULL) {
+			authorized = mg_http_check_digest_auth(hm, mg_str(domain), fp);
+			fclose(fp);
+		}
+	}
+
+	return authorized;
+}
+
+static void mg_http_send_digest_auth_request(struct mg_connection *c, const char *domain)
+{
+	mg_printf(c,
+			  "HTTP/1.1 401 Unauthorized\r\n"
+			  "WWW-Authenticate: Digest qop=\"auth\", "
+			  "realm=\"%s\", nonce=\"%lx\"\r\n"
+			  "Content-Length: 0\r\n\r\n",
+			  domain, (unsigned long) mg_time());
+}
 
 /*
  * These functions are for V2 of the protocol
@@ -100,24 +331,34 @@ static const char *get_source_string(unsigned int source)
 	return str[source];
 }
 
-static void restart_handler(struct mg_connection *nc, int ev, void *ev_data)
+static void restart_handler(struct mg_connection *nc, void *ev_data)
 {
-	struct http_message *hm = (struct http_message *) ev_data;
+	struct mg_http_message *hm = (struct mg_http_message *) ev_data;
 	ipc_message msg = {};
 
-	if (ev == MG_EV_HTTP_REQUEST) {
-		if(mg_vcasecmp(&hm->method, "POST") != 0) {
-			mg_http_send_error(nc, 405, "Method Not Allowed");
-			return;
-		}
+	if(mg_vcasecmp(&hm->method, "POST") != 0) {
+		mg_http_reply(nc, 405, "", "%s", "Method Not Allowed\n");
+		return;
+	}
 
-		int ret = ipc_postupdate(&msg);
-		if (ret || msg.type != ACK) {
-			mg_http_send_error(nc, 500, "Failed to queue command");
-			return;
-		}
+	int ret = ipc_postupdate(&msg);
+	if (ret || msg.type != ACK) {
+		mg_http_reply(nc, 500, "", "%s", "Failed to queue command\n");
+		return;
+	}
+
+	mg_http_reply(nc, 201, "", "%s", "Device will reboot now.\n");
+}
 
-		mg_http_send_error(nc, 201, "Device will reboot now.");
+static void broadcast_callback(struct mg_connection *nc, int ev,
+		void __attribute__ ((__unused__)) *ev_data, void __attribute__ ((__unused__)) *fn_data)
+{
+	if (ev == MG_EV_READ) {
+		struct mg_connection *t;
+		for (t = nc->mgr->conns; t != NULL; t = t->next) {
+			if (t->label[0] != 'W') continue;
+			mg_ws_send(t,(char *)nc->recv.buf, nc->recv.len, WEBSOCKET_OP_TEXT);
+		}
 	}
 }
 
@@ -137,25 +378,12 @@ static int level_to_rfc_5424(int level)
 	}
 }
 
-static void broadcast_callback(struct mg_connection *nc, int ev, void *ev_data)
+static void broadcast(char *str)
 {
-	char *buf = (char *) ev_data;
-
-	if (ev != MG_EV_POLL)
-		return;
-
-	if (!(nc->flags & MG_F_IS_WEBSOCKET))
-		return;
-
-	mg_send_websocket_frame(nc, WEBSOCKET_OP_TEXT, buf, strlen(buf));
-}
-
-static void broadcast(struct mg_mgr *mgr, char *str)
-{
-	mg_broadcast(mgr, broadcast_callback, str, strlen(str) + 1);
+	mg_mgr_wakeup(ws_pipe, str, strlen(str));
 }
 
-static void *broadcast_message_thread(void *data)
+static void *broadcast_message_thread(void __attribute__ ((__unused__)) *data)
 {
 	int fd = -1;
 
@@ -177,8 +405,8 @@ static void *broadcast_message_thread(void *data)
 		if (ret != sizeof(msg))
 			return NULL;
 
-		if (strlen(msg.data.notify.msg) != 0) {
-			struct mg_mgr *mgr = (struct mg_mgr *) data;
+		if (strlen(msg.data.notify.msg) != 0 &&
+				msg.data.status.current != PROGRESS) {
 			char text[4096];
 			char str[4160];
 
@@ -193,23 +421,20 @@ static void *broadcast_message_thread(void *data)
 					 level_to_rfc_5424(msg.data.notify.level), /* RFC 5424 */
 					 text);
 
-			broadcast(mgr, str);
+			broadcast(str);
 		}
 	}
-
-	return NULL;
 }
 
-static void *broadcast_progress_thread(void *data)
+static void *broadcast_progress_thread(void __attribute__ ((__unused__)) *data)
 {
 	RECOVERY_STATUS status = -1;
 	sourcetype source = -1;
 	unsigned int step = 0;
-	unsigned int percent = 0;
+	uint8_t percent = 0;
 	int fd = -1;
 
 	for (;;) {
-		struct mg_mgr *mgr = (struct mg_mgr *) data;
 		struct progress_msg msg;
 		char str[512];
 		char escaped[512];
@@ -241,7 +466,7 @@ static void *broadcast_progress_thread(void *data)
 				"\t\"status\": \"%s\"\r\n"
 				"}\r\n",
 				escaped);
-			broadcast(mgr, str);
+			broadcast(str);
 		}
 
 		if (msg.source != source) {
@@ -253,7 +478,7 @@ static void *broadcast_progress_thread(void *data)
 				"\t\"source\": \"%s\"\r\n"
 				"}\r\n",
 				get_source_string(msg.source));
-			broadcast(mgr, str);
+			broadcast(str);
 		}
 
 		if (msg.status == SUCCESS && msg.source == SOURCE_WEBSERVER && run_postupdate) {
@@ -271,7 +496,7 @@ static void *broadcast_progress_thread(void *data)
 				"\t\"source\": \"%s\"\r\n"
 				"}\r\n",
 				escaped);
-			broadcast(mgr, str);
+			broadcast(str);
 		}
 
 		if ((msg.cur_step != step || msg.cur_percent != percent) &&
@@ -293,147 +518,189 @@ static void *broadcast_progress_thread(void *data)
 				msg.cur_step,
 				escaped,
 				msg.cur_percent);
-			broadcast(mgr, str);
+			broadcast(str);
 		}
 	}
+}
 
-	return NULL;
+static void timer_ev_handler(void *fn_data)
+{
+	struct mg_connection *nc = (struct mg_connection *) fn_data;
+	struct file_upload_state *fus = nc->fn_data;
+	/*
+	 * Check if a multi-part was initiated
+	 */
+	if (fus && (watchdog_conn > 0) &&
+		(mg_millis() - fus->last_io_time > (watchdog_conn * 1000))) {
+		/* Connection lost, drop data */
+		ERROR("Connection lost, no data for %ld seconds, closing...",
+			  (mg_millis() - fus->last_io_time) / 1000);
+		mg_http_reply(nc, 408, "", "%s", "Request Timeout\n");
+		nc->is_draining = 1;
+		mg_timer_free(&fus->timer);
+	}
 }
 
 /*
  * Code common to V1 and V2
  */
-static void upload_handler(struct mg_connection *nc, int ev, void *p)
+static void upload_handler(struct mg_connection *nc, int ev, void *ev_data,
+		void __attribute__ ((__unused__)) *fn_data)
 {
-	struct mg_http_multipart_part *mp;
+	struct mg_http_multipart *mp;
 	struct file_upload_state *fus;
+	unsigned int percent;
 	ssize_t written;
 
 	switch (ev) {
-	case MG_EV_HTTP_PART_BEGIN:
-		mp = (struct mg_http_multipart_part *) p;
-
-		fus = (struct file_upload_state *) calloc(1, sizeof(*fus));
-		if (fus == NULL) {
-			mg_http_send_error(nc, 500, "Out of memory");
-			break;
-		}
+		case MG_EV_HTTP_PART_BEGIN:
+			mp = (struct mg_http_multipart *) ev_data;
+
+			fus = (struct file_upload_state *) calloc(1, sizeof(*fus));
+			if (fus == NULL) {
+				mg_http_reply(nc, 500, "", "%s", "Out of memory\n");
+				nc->is_draining = 1;
+				break;
+			}
 
-		struct swupdate_request req;
-		swupdate_prepare_req(&req);
-		req.len = strlen(mp->file_name);
-		strncpy(req.info, mp->file_name, sizeof(req.info) - 1);
-		req.source = SOURCE_WEBSERVER;
-		fus->fd = ipc_inst_start_ext(&req, sizeof(req));
-		if (fus->fd < 0) {
-			mg_http_send_error(nc, 500, "Failed to queue command");
-			free(fus);
-			break;
-		}
+			struct swupdate_request req;
+			swupdate_prepare_req(&req);
+			req.len = mp->len;
+			strncpy(req.info, mp->part.filename.ptr, sizeof(req.info) - 1);
+			req.source = SOURCE_WEBSERVER;
+			fus->fd = ipc_inst_start_ext(&req, sizeof(req));
+			if (fus->fd < 0) {
+				mg_http_reply(nc, 500, "", "%s", "Failed to queue command\n");
+				nc->is_draining = 1;
+				free(fus);
+				break;
+			}
 
-		if (swupdate_file_setnonblock(fus->fd, true)) {
-			WARN("IPC cannot be set in non-blocking, fallback to block mode");
-		}
+			swupdate_download_update(0, mp->len);
 
-		mp->user_data = fus;
+			if (swupdate_file_setnonblock(fus->fd, true)) {
+				WARN("IPC cannot be set in non-blocking, fallback to block mode");
+			}
 
-		/*
-		 * There is no user data for connection.
-		 * Set the user data to the same structure to make it available
-		 * to the MG_TIMER event
-		 */
-		nc->user_data = mp->user_data;
+			mp->user_data = fus;
 
-		if (watchdog_conn > 0) {
-			TRACE("Setting Webserver Watchdog Timer to %d", watchdog_conn);
-			mg_set_timer(nc, mg_time() + watchdog_conn);
-		}
+			/*
+			 * There is no user data for connection.
+			 * Set the user data to the same structure to make it available
+			 * to the MG_TIMER event
+			 */
+			nc->fn_data = mp->user_data;
 
-		break;
+			fus->last_io_time = mg_millis();
 
-	case MG_EV_HTTP_PART_DATA:
-		mp = (struct mg_http_multipart_part *) p;
-		fus = (struct file_upload_state *) mp->user_data;
+			if (watchdog_conn > 0) {
+				TRACE("Setting Webserver Watchdog Timer to %d", watchdog_conn);
+				mg_timer_init(&fus->timer, 1000, MG_TIMER_REPEAT, timer_ev_handler, nc);
+			}
 
-		if (!fus)
 			break;
 
-		written = write(fus->fd, (char *) mp->data.p, mp->data.len);
-		/*
-		 * IPC seems to block, wait for a while
-		 */
-		if (written != mp->data.len) {
-			if (written < 0) {
-				if (errno != EAGAIN && errno != EWOULDBLOCK) {
-					if (!fus->error_report) {
-						ERROR("Writing to IPC fails due to %s", strerror(errno));
-						fus->error_report = true;
-					}
-					/*
-					 * Simply consumes the data to unblock the sender
-					 */
-					written = mp->data.len;
-				} else
-					written = 0;
+		case MG_EV_HTTP_PART_DATA:
+			mp = (struct mg_http_multipart *) ev_data;
+			fus = (struct file_upload_state *) mp->user_data;
+
+			if (!fus)
+				break;
+
+			written = write(fus->fd, (char *) mp->part.body.ptr, mp->part.body.len);
+			/*
+			 * IPC seems to block, wait for a while
+			 */
+			if (written != mp->part.body.len) {
+				if (written < 0) {
+					if (errno != EAGAIN && errno != EWOULDBLOCK) {
+						if ((mp->part.body.len + fus->len) == mp->len) {
+							/*
+							 * Simply consumes the data to unblock the sender
+							 */
+							written = (ssize_t) mp->part.body.len;
+						} else if (!fus->error_report) {
+							ERROR("Writing to IPC fails due to %s", strerror(errno));
+							fus->error_report = true;
+							nc->is_draining = 1;
+						}
+					} else
+						written = 0;
+				}
+				usleep(100);
 			}
-			usleep(100);
-		}
 
-		mp->num_data_consumed = written;
-		fus->len += written;
-
-		break;
+			mp->num_data_consumed = written;
+			fus->len += written;
+			percent = (uint8_t)(100.0 * ((double)fus->len / (double)mp->len));
+			if (percent != fus->percent) {
+				fus->percent = percent;
+				swupdate_download_update(fus->percent, mp->len);
+			}
 
-	case MG_EV_HTTP_PART_END:
-		mp = (struct mg_http_multipart_part *) p;
-		fus = (struct file_upload_state *) mp->user_data;
+			fus->last_io_time = mg_millis();
 
-		if (!fus)
 			break;
 
-		ipc_end(fus->fd);
+		case MG_EV_HTTP_PART_END:
+			mp = (struct mg_http_multipart *) ev_data;
+			fus = (struct file_upload_state *) mp->user_data;
+
+			if (!fus)
+				break;
+
+			ipc_end(fus->fd);
 
-		mg_send_response_line(nc, 200,
-			"Content-Type: text/plain\r\n"
-			"Connection: close");
-		mg_send(nc, "\r\n", 2);
-		mg_printf(nc, "Ok, %s - %d bytes.\r\n", mp->file_name, (int) fus->len);
-		nc->flags |= MG_F_SEND_AND_CLOSE;
+			mg_http_reply(nc, 200, "%s",
+								  "Content-Type: text/plain\r\n"
+								  "Connection: close");
+			mg_send(nc, "\r\n", 2);
+			mg_printf(nc, "Ok, %s - %d bytes.\r\n", mp->part.filename, (int) fus->len);
+			nc->is_draining = 1;
 
-		mp->user_data = NULL;
-		nc->user_data = mp->user_data;
-		free(fus);
-		break;
+			mp->user_data = NULL;
+			nc->fn_data = mp->user_data;
+			mg_timer_free(&fus->timer);
+			free(fus);
+			break;
 	}
 }
 
-static void ev_handler(struct mg_connection *nc, int ev, void *ev_data)
+static void websocket_handler(struct mg_connection *nc, void *ev_data)
 {
-	time_t now;
+	struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+	mg_ws_upgrade(nc, hm, NULL);
+	nc->label[0] = 'W';
+}
 
-	switch (ev) {
-	case MG_EV_HTTP_REQUEST:
-		mg_serve_http(nc, ev_data, s_http_server_opts);
-		break;
-	case MG_EV_TIMER:
-		now = (time_t) mg_time();
-		/*
-		 * Check if a multi-part was initiated
-		 */
-		if (nc->user_data && (watchdog_conn > 0) &&
-			(difftime(now, nc->last_io_time) > watchdog_conn)) {
-			struct file_upload_state *fus;
-
-		       /* Connection lost, drop data */
-			ERROR("Connection lost, no data since %ld now %ld, closing...",
-				nc->last_io_time, now);
-			fus = (struct file_upload_state *) nc->user_data;
-			ipc_end(fus->fd);
-			nc->user_data = NULL;
-			nc->flags |= MG_F_CLOSE_IMMEDIATELY;
-		} else
-			mg_set_timer(nc, mg_time() + watchdog_conn);  // Send us timer event again after 0.5 seconds
-		break;
+static void ev_handler(struct mg_connection *nc, int ev, void *ev_data, void *fn_data)
+{
+	if (ev == MG_EV_HTTP_MSG) {
+		struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+		if (!mg_http_is_authorized(hm, global_auth_domain, global_auth_file))
+			mg_http_send_digest_auth_request(nc, global_auth_domain);
+		else if (mg_http_get_header(hm, "Sec-WebSocket-Key") != NULL)
+			websocket_handler(nc, ev_data);
+		else if (mg_http_match_uri(hm, "/restart"))
+			restart_handler(nc, ev_data);
+		else
+			mg_http_serve_dir(nc, ev_data, &s_http_server_opts);
+	} else if (nc->label[0] != 'M' && ev == MG_EV_HTTP_CHUNK) {
+		struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+		if (!mg_http_is_authorized(hm, global_auth_domain, global_auth_file))
+			mg_http_send_digest_auth_request(nc, global_auth_domain);
+		else if (mg_http_match_uri(hm, "/upload"))
+			multipart_upload_handler(nc, ev, ev_data, upload_handler, NULL);
+	} else if (nc->label[0] == 'M' && (ev == MG_EV_READ || ev == MG_EV_POLL || ev == MG_EV_CLOSE)) {
+		multipart_upload_handler(nc, ev, ev_data, upload_handler, fn_data);
+#if MG_ENABLE_SSL
+	} else if (ev == MG_EV_ACCEPT && ssl) {
+		mg_tls_init(nc, &tls_opts);
+#endif
+	} else if (ev == MG_EV_ERROR) {
+		ERROR("%p %s", nc->fd, (char *) ev_data);
+	} else if (ev == MG_EV_WS_MSG) {
+		mg_iobuf_del(&nc->recv, 0, nc->recv.len);
 	}
 }
 
@@ -521,13 +788,13 @@ int start_mongoose(const char *cfgfname, int argc, char *argv[])
 	struct mongoose_options opts;
 	struct mg_mgr mgr;
 	struct mg_connection *nc;
-	struct mg_bind_opts bind_opts;
-	const char *s_http_port = NULL;
-	const char *err_str;
+	char *url = NULL;
+	char buf[50];
+	int choice;
+
 #if MG_ENABLE_SSL
-	bool ssl = false;
+	ssl = false;
 #endif
-	int choice = 0;
 
 	memset(&opts, 0, sizeof(opts));
 
@@ -598,61 +865,62 @@ int start_mongoose(const char *cfgfname, int argc, char *argv[])
 		}
 	}
 
-	s_http_server_opts.document_root =
+	s_http_server_opts.root_dir =
 		opts.root ? opts.root : MG_ROOT;
-	s_http_server_opts.enable_directory_listing =
-		opts.listing ? "yes" : "no";
-	s_http_port = opts.port ? opts.port : MG_PORT;
-	s_http_server_opts.global_auth_file = opts.global_auth_file;
-	s_http_server_opts.auth_domain = opts.auth_domain;
-
-	memset(&bind_opts, 0, sizeof(bind_opts));
-	bind_opts.error_string = &err_str;
+	if (!opts.listing)
+		s_http_server_opts.fs = &fs_posix_no_list;
+	global_auth_file = opts.global_auth_file;
+	global_auth_domain = opts.auth_domain;
+
 #if MG_ENABLE_SSL
 	if (ssl) {
-		bind_opts.ssl_cert = opts.ssl_cert;
-		bind_opts.ssl_key = opts.ssl_key;
+		tls_opts.cert = opts.ssl_cert;
+		tls_opts.certkey = opts.ssl_key;
 	}
 #endif
 
-	mg_mgr_init(&mgr, NULL);
+	signal(SIGINT, signal_handler);
+	signal(SIGTERM, signal_handler);
+	mg_mgr_init(&mgr);
+
+	ws_pipe = mg_mkpipe(&mgr, broadcast_callback, NULL);
+
+	/* Parse url with port only fallback */
+	if (opts.port) {
+		if (mg_url_port(opts.port) != 0) {
+			url = strdup(opts.port);
+		} else {
+			char *end;
+			errno = 0;
+			unsigned long port = strtoul(opts.port, &end, 10);
+			if (opts.port == end || errno || *end || port > 65535)
+				url = strdup(opts.port);
+			else
+				mg_asprintf(&url, 0, ":%lu", port);
+		}
+		free(opts.port);
+	} else {
+		mg_asprintf(&url, 0, ":%s", MG_PORT);
+	}
 
-	nc = mg_bind_opt(&mgr, s_http_port, ev_handler, bind_opts);
+	nc = mg_http_listen(&mgr, url, ev_handler, NULL);
 	if (nc == NULL) {
-		ERROR("Failed to start Mongoose: %s", *bind_opts.error_string);
+		ERROR("Failed to start Mongoose.");
 		exit(EXIT_FAILURE);
 	}
 
-	/*
-	 * The Event Handler in Webserver will read from socket until there is data.
-	 * This does not guarantes a flow control because data are forwarded
-	 * to SWUpdate internal IPC. If this is not called in blocking mode,
-	 * the Webserver should just read from socket to fill the IPC, but without
-	 * filling all memory.
-	 */
-	nc->recv_mbuf_limit = 256 * 1024;
-
-	mg_set_protocol_http_websocket(nc);
-	mg_register_http_endpoint(nc, "/restart", restart_handler);
-	mg_register_http_endpoint(nc, "/upload", MG_CB(upload_handler, NULL));
-	mg_start_thread(broadcast_message_thread, &mgr);
-	mg_start_thread(broadcast_progress_thread, &mgr);
+	start_thread(broadcast_message_thread, NULL);
+	start_thread(broadcast_progress_thread, NULL);
 
-	INFO("Mongoose web server version %s with pid %d started on port(s) %s with web root [%s]",
-		MG_VERSION, getpid(), s_http_port,
-		s_http_server_opts.document_root);
+	INFO("Mongoose web server version %s with pid %d started on [%s] with web root [%s]",
+		MG_VERSION, getpid(), mg_straddr(&nc->peer, buf, sizeof(buf)),
+		s_http_server_opts.root_dir);
 
-	for (;;) {
+	while (s_signo == 0)
 		mg_mgr_poll(&mgr, 100);
-	}
 	mg_mgr_free(&mgr);
 
-	return 0;
-}
+	free(url);
 
-#if MG_ENABLE_SSL && MG_SSL_IF == MG_SSL_IF_MBEDTLS
-#include <mbedtls/ctr_drbg.h>
-int mg_ssl_if_mbed_random(void *ctx, unsigned char *buf, size_t len) {
-	return mbedtls_ctr_drbg_random(ctx, buf, len);
+	return 0;
 }
-#endif
diff --git a/mongoose/mongoose_multipart.c b/mongoose/mongoose_multipart.c
new file mode 100644
index 0000000..1c16fc5
--- /dev/null
+++ b/mongoose/mongoose_multipart.c
@@ -0,0 +1,336 @@
+/*
+ * Copyright (c) 2004-2013 Sergey Lyubka
+ * Copyright (c) 2013-2020 Cesanta Software Limited
+ * All rights reserved
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+#include "mongoose_multipart.h"
+
+enum mg_http_multipart_stream_state {
+	MPS_BEGIN,
+	MPS_WAITING_FOR_BOUNDARY,
+	MPS_WAITING_FOR_CHUNK,
+	MPS_GOT_BOUNDARY,
+	MPS_FINALIZE,
+	MPS_FINISHED
+};
+
+struct mg_http_multipart_stream {
+	struct mg_http_part part;
+	struct mg_str boundary;
+	void *user_data;
+	enum mg_http_multipart_stream_state state;
+	int processing_part;
+	int data_avail;
+	size_t len;
+};
+
+static void mg_http_free_proto_data_mp_stream(
+		struct mg_http_multipart_stream *mp) {
+	free((void *) mp->boundary.ptr);
+	free((void *) mp->part.name.ptr);
+	free((void *) mp->part.filename.ptr);
+	memset(mp, 0, sizeof(*mp));
+}
+
+static void mg_http_multipart_begin(struct mg_connection *c,
+									struct mg_http_message *hm) {
+	struct mg_http_multipart_stream *mp_stream;
+	struct mg_str *ct;
+	struct mg_iobuf *io = &c->recv;
+
+	struct mg_str boundary;
+
+	ct = mg_http_get_header(hm, "Content-Type");
+	if (ct == NULL) {
+		/* We need more data - or it isn't multipart message */
+		return;
+	}
+
+	/* Content-type should start with "multipart" */
+	if (ct->len < 9 || strncmp(ct->ptr, "multipart", 9) != 0) {
+		return;
+	}
+
+	boundary = mg_http_get_header_var(*ct, mg_str_n("boundary", 8));
+	if (boundary.len == 0) {
+		/*
+		 * Content type is multipart, but there is no boundary,
+		 * probably malformed request
+		 */
+		c->is_draining = 1;
+		LOG(LL_DEBUG,("invalid request"));
+		return;
+	}
+
+	/* If we reach this place - that is multipart request */
+
+	if (c->pfn_data != NULL) {
+		/*
+		 * Another streaming request was in progress,
+		 * looks like protocol error
+		 */
+		c->is_draining = 1;
+	} else {
+		mp_stream = calloc(1, sizeof(struct mg_http_multipart_stream));
+		mp_stream->state = MPS_BEGIN;
+		mp_stream->boundary = mg_strdup(boundary);
+		mp_stream->part.name.ptr = mp_stream->part.filename.ptr = NULL;
+		mp_stream->part.name.len = mp_stream->part.filename.len = 0;
+		mp_stream->len = hm->body.len;
+		c->pfn_data = mp_stream;
+
+		mg_call(c, MG_EV_HTTP_MULTIPART_REQUEST, hm);
+
+		mg_iobuf_del(io, 0, hm->head.len + 2);
+	}
+}
+
+#define CONTENT_DISPOSITION "Content-Disposition: "
+
+static size_t mg_http_multipart_call_handler(struct mg_connection *c, int ev,
+											 const char *data,
+											 size_t data_len) {
+	struct mg_http_multipart mp;
+	struct mg_http_multipart_stream *mp_stream = c->pfn_data;
+	memset(&mp, 0, sizeof(mp));
+
+	mp.part.name = mp_stream->part.name;
+	mp.part.filename = mp_stream->part.filename;
+	mp.user_data = mp_stream->user_data;
+	mp.part.body.ptr = data;
+	mp.part.body.len = data_len;
+	mp.num_data_consumed = data_len;
+	mp.len = mp_stream->len;
+	mg_call(c, ev, &mp);
+	mp_stream->user_data = mp.user_data;
+	mp_stream->data_avail = (mp.num_data_consumed != data_len);
+	return mp.num_data_consumed;
+}
+
+static void mg_http_multipart_finalize(struct mg_connection *c) {
+	struct mg_http_multipart_stream *mp_stream = c->pfn_data;
+
+	mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_END, NULL, 0);
+	free((void *) mp_stream->part.filename.ptr);
+	mp_stream->part.filename.ptr = NULL;
+	free((void *) mp_stream->part.name.ptr);
+	mp_stream->part.name.ptr = NULL;
+	mg_http_multipart_call_handler(c, MG_EV_HTTP_MULTIPART_REQUEST_END, NULL, 0);
+	mg_http_free_proto_data_mp_stream(mp_stream);
+	mp_stream->state = MPS_FINISHED;
+	free(mp_stream);
+	c->label[0] = '\0';
+}
+
+static int mg_http_multipart_wait_for_boundary(struct mg_connection *c) {
+	const char *boundary;
+	struct mg_iobuf *io = &c->recv;
+	struct mg_http_multipart_stream *mp_stream = c->pfn_data;
+
+	if (mp_stream->boundary.len == 0) {
+		mp_stream->state = MPS_FINALIZE;
+		LOG(LL_DEBUG,("Invalid request: boundary not initialized"));
+		return 0;
+	}
+
+	if ((int) io->len < mp_stream->boundary.len + 2) {
+		return 0;
+	}
+
+	boundary = mg_strstr(mg_str_n((char *) io->buf, io->len), mp_stream->boundary);
+	if (boundary != NULL) {
+		const char *boundary_end = (boundary + mp_stream->boundary.len);
+		if (io->len - (boundary_end - (char *) io->buf) < 4) {
+			return 0;
+		}
+		if (strncmp(boundary_end, "--\r\n", 4) == 0) {
+			mp_stream->state = MPS_FINALIZE;
+			mg_iobuf_del(io, 0, (boundary_end - (char *) io->buf) + 4);
+		} else {
+			mp_stream->state = MPS_GOT_BOUNDARY;
+		}
+	} else {
+		return 0;
+	}
+
+	return 1;
+}
+
+static size_t mg_get_line_len(const char *buf, size_t buf_len) {
+	size_t len = 0;
+	while (len < buf_len && buf[len] != '\n') len++;
+	return len == buf_len ? 0 : len + 1;
+}
+
+static int mg_http_multipart_process_boundary(struct mg_connection *c) {
+	size_t data_size;
+	const char *boundary, *block_begin;
+	struct mg_iobuf *io = &c->recv;
+	struct mg_http_multipart_stream *mp_stream = c->pfn_data;
+	size_t line_len;
+	boundary = mg_strstr(mg_str_n((char *) io->buf, io->len), mp_stream->boundary);
+	block_begin = boundary + mp_stream->boundary.len + 2;
+	data_size = io->len - (block_begin - (char *) io->buf);
+	mp_stream->len -= ((2 * mp_stream->boundary.len) + 6);
+
+	while (data_size > 0 &&
+		   (line_len = mg_get_line_len(block_begin, data_size)) != 0) {
+		mp_stream->len -= (line_len + 2);
+		if (line_len > sizeof(CONTENT_DISPOSITION) &&
+			mg_ncasecmp(block_begin, CONTENT_DISPOSITION,
+						sizeof(CONTENT_DISPOSITION) - 1) == 0) {
+			struct mg_str header;
+
+			header.ptr = block_begin + sizeof(CONTENT_DISPOSITION) - 1;
+			header.len = line_len - sizeof(CONTENT_DISPOSITION) - 1;
+
+			mp_stream->part.name = mg_strdup(mg_http_get_header_var(header, mg_str_n("name", 4)));
+			mp_stream->part.filename = mg_strdup(mg_http_get_header_var(header, mg_str_n("filename", 8)));
+
+			block_begin += line_len;
+			data_size -= line_len;
+
+			continue;
+		}
+
+		if (line_len == 2 && mg_ncasecmp(block_begin, "\r\n", 2) == 0) {
+			if (mp_stream->processing_part != 0) {
+				mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_END, NULL, 0);
+			}
+
+			mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_BEGIN, NULL, 0);
+			mp_stream->state = MPS_WAITING_FOR_CHUNK;
+			mp_stream->processing_part++;
+
+			mg_iobuf_del(io, 0, block_begin - (char *) io->buf + 2);
+			return 1;
+		}
+
+		block_begin += line_len;
+	}
+
+	mp_stream->state = MPS_WAITING_FOR_BOUNDARY;
+
+	return 0;
+}
+
+static int mg_http_multipart_continue_wait_for_chunk(struct mg_connection *c) {
+	struct mg_http_multipart_stream *mp_stream = c->pfn_data;
+	struct mg_iobuf *io = &c->recv;
+
+	const char *boundary;
+	if ((int) io->len < mp_stream->boundary.len + 6 /* \r\n, --, -- */) {
+		return 0;
+	}
+
+	boundary = mg_strstr(mg_str_n((char *) io->buf, io->len), mp_stream->boundary);
+	if (boundary == NULL) {
+		size_t data_len = io->len - (mp_stream->boundary.len + 6);
+		if (data_len > 0) {
+			size_t consumed = mg_http_multipart_call_handler(
+					c, MG_EV_HTTP_PART_DATA, (char *) io->buf, (size_t) data_len);
+			mg_iobuf_del(io, 0, consumed);
+		}
+		return 0;
+	} else {
+		size_t data_len = io->len - (mp_stream->boundary.len + 8);
+		size_t consumed = mg_http_multipart_call_handler(c, MG_EV_HTTP_PART_DATA,
+														 (char *) io->buf, data_len);
+		mg_iobuf_del(io, 0, consumed);
+		if (consumed == data_len) {
+			mg_iobuf_del(io, 0, mp_stream->boundary.len + 8);
+			mp_stream->state = MPS_FINALIZE;
+			return 1;
+		} else {
+			return 0;
+		}
+	}
+}
+
+static void mg_http_multipart_continue(struct mg_connection *c) {
+	struct mg_http_multipart_stream *mp_stream = c->pfn_data;
+	while (1) {
+		switch (mp_stream->state) {
+			case MPS_BEGIN: {
+				mp_stream->state = MPS_WAITING_FOR_BOUNDARY;
+				break;
+			}
+			case MPS_WAITING_FOR_BOUNDARY: {
+				if (mg_http_multipart_wait_for_boundary(c) == 0) {
+					return;
+				}
+				break;
+			}
+			case MPS_GOT_BOUNDARY: {
+				if (mg_http_multipart_process_boundary(c) == 0) {
+					return;
+				}
+				break;
+			}
+			case MPS_WAITING_FOR_CHUNK: {
+				if (mg_http_multipart_continue_wait_for_chunk(c) == 0) {
+					return;
+				}
+				break;
+			}
+			case MPS_FINALIZE: {
+				mg_http_multipart_finalize(c);
+				return;
+			}
+			case MPS_FINISHED: {
+				return;
+			}
+		}
+	}
+}
+
+void multipart_upload_handler(struct mg_connection *c, int ev, void *ev_data, mg_event_handler_t fn,
+		void __attribute__ ((__unused__)) *fn_data)
+{
+	struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+	struct mg_http_multipart_stream *mp_stream = c->pfn_data;
+	struct mg_str *s;
+
+	if (mp_stream != NULL && mp_stream->boundary.len != 0) {
+		if (ev == MG_EV_READ || (ev == MG_EV_POLL && mp_stream->data_avail)) {
+			mg_http_multipart_continue(c);
+		} else if (ev == MG_EV_CLOSE) {
+			/*
+			 * Multipart message is in progress, but connection is closed.
+			 * Finish part and request with an error flag.
+			 */
+			mp_stream->state = MPS_FINALIZE;
+			mg_http_multipart_continue(c);
+		}
+		return;
+	}
+
+	if (ev == MG_EV_HTTP_CHUNK) {
+		s = mg_http_get_header(hm, "Content-Type");
+		if (s != NULL && s->len >= 9 && strncmp(s->ptr, "multipart", 9) == 0) {
+			/* New request - new proto data */
+			c->label[0] = 'M';
+
+			c->pfn = fn;
+			mg_http_multipart_begin(c, hm);
+			mg_http_multipart_continue(c);
+			return;
+		}
+	}
+}
\ No newline at end of file
diff --git a/mongoose/mongoose_multipart.h b/mongoose/mongoose_multipart.h
new file mode 100644
index 0000000..13a31dc
--- /dev/null
+++ b/mongoose/mongoose_multipart.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2004-2013 Sergey Lyubka
+ * Copyright (c) 2013-2020 Cesanta Software Limited
+ * All rights reserved
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * This software is dual-licensed: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. For the terms of this
+ * license, see <http://www.gnu.org/licenses/>.
+ *
+ * You are free to use this software under the terms of the GNU General
+ * Public License, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * Alternatively, you can license this software under a commercial
+ * license, as set out in <https://www.cesanta.com/license>.
+ */
+
+#include "mongoose.h"
+
+enum {
+	MG_EV_HTTP_MULTIPART_REQUEST=MG_EV_USER + 1,  // struct mg_http_message *
+	MG_EV_HTTP_PART_BEGIN,                        // struct mg_http_multipart_part *
+	MG_EV_HTTP_PART_DATA,                         // struct mg_http_multipart_part *
+	MG_EV_HTTP_PART_END,                          // struct mg_http_multipart_part *
+	MG_EV_HTTP_MULTIPART_REQUEST_END              // struct mg_http_multipart_part *
+};
+
+/* HTTP multipart part */
+struct mg_http_multipart {
+	struct mg_http_part part;
+	int status; /* <0 on error */
+	void *user_data;
+	/*
+	 * User handler can indicate how much of the data was consumed
+	 * by setting this variable. By default, it is assumed that all
+	 * data has been consumed by the handler.
+	 * If not all data was consumed, user's handler will be invoked again later
+	 * with the remainder.
+	 */
+	size_t num_data_consumed;
+	size_t len;
+};
+
+void multipart_upload_handler(struct mg_connection *nc, int ev, void *ev_data, mg_event_handler_t fn, void *fn_data);

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From: James Hilliard <james.hilliard1@gmail.com>
To: swupdate@googlegroups.com
Cc: James Hilliard <james.hilliard1@gmail.com>
Subject: [swupdate] [PATCH v8 3/3] mongoose: Add SPDX
Date: Thu, 17 Feb 2022 18:27:18 -0700
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Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
---
Changes v6 -> v7:
  - add SPDX to mongoose header
---
 mongoose/mongoose.c | 2 ++
 mongoose/mongoose.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/mongoose/mongoose.c b/mongoose/mongoose.c
index d5b1dd9..049df8b 100644
--- a/mongoose/mongoose.c
+++ b/mongoose/mongoose.c
@@ -2,6 +2,8 @@
 // Copyright (c) 2013-2021 Cesanta Software Limited
 // All rights reserved
 //
+// SPDX-License-Identifier: GPL-2.0-only
+//
 // This software is dual-licensed: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License version 2 as
 // published by the Free Software Foundation. For the terms of this
diff --git a/mongoose/mongoose.h b/mongoose/mongoose.h
index 1398306..3240388 100644
--- a/mongoose/mongoose.h
+++ b/mongoose/mongoose.h
@@ -2,6 +2,8 @@
 // Copyright (c) 2013-2021 Cesanta Software Limited
 // All rights reserved
 //
+// SPDX-License-Identifier: GPL-2.0-only
+//
 // This software is dual-licensed: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License version 2 as
 // published by the Free Software Foundation. For the terms of this