Refactor Mongoose documentation

PUBLISHED_FROM=e9a4e5c7b4a1d03b93a2a79e29de19e60e919929

docs/http/client_example.md

@@ -0,0 +1,44 @@
+---
+title: HTTP client example
+---
+
+To create an HTTP client, follow this pattern:
+
+1. Create an outbound connection by calling `mg_connect_http()`
+2. Create an event handler function that handles `MG_EV_HTTP_REPLY` event
+
+Here's an example of the simplest HTTP client.
+Error checking is omitted for the sake of clarity:
+
+```c
+#include "mongoose.h"
+
+static const char *url = "http://www.google.com";
+static int exit_flag = 0;
+
+static void ev_handler(struct mg_connection *c, int ev, void *p) {
+  if (ev == MG_EV_HTTP_REPLY) {
+    c->flags |= MG_F_CLOSE_IMMEDIATELY;
+    fwrite(hm->message.p, 1, hm->message.len, stdout);
+    putchar('\n');
+    exit_flag = 1;
+  }
+}
+
+int main(void) {
+  struct mg_mgr mgr;
+
+  mg_mgr_init(&mgr, NULL);
+  mg_connect_http(mgr, ev_handler, url, NULL, NULL);
+
+
+  while (exit_flag == 0) {
+    mg_mgr_poll(&mgr, 1000);
+  }
+  mg_mgr_free(&mgr);
+
+  return 0;
+}
+```
+
+See full source code at [HTTP client example](https://github.com/cesanta/dev/tree/master/mongoose/examples/http_client).