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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 v5 1/3] mongoose: Update to version 7.6
Date: Mon,  7 Feb 2022 17:38:20 -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