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注意事项：
"wss://localhost:8000/websocket"; 对于 wss 域名，mongoose不支持，需要使用 ws 域名。
原因：wss域名需要证书授权认证。
#include "mongoose.h"
static const char *s_url = "ws://localhost:8000/websocket";
// Print websocket response and signal that we're done
static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
? if (ev == MG_EV_ERROR) {
? ? // On error, log error message
? ? LOG(LL_ERROR, ("%p %s", c->fd, (char *) ev_data));
? } else if (ev == MG_EV_WS_OPEN) {
? ? // When websocket handshake is successful, send message
? ? mg_ws_send(c, "hello", 5, WEBSOCKET_OP_TEXT);
? } else if (ev == MG_EV_WS_MSG) {
? ? // When we get echo response, print it
? ? struct mg_ws_message *wm = (struct mg_ws_message *) ev_data;
? ? printf("GOT ECHO REPLY: [%.*s]\n", (int) wm->data.len, wm->data.ptr);
? }
? if (ev == MG_EV_ERROR || ev == MG_EV_CLOSE || ev == MG_EV_WS_MSG) {
? ? *(bool *) fn_data = true; ?// Signal that we're done
? }
}
int main(void) {
? struct mg_mgr mgr; ? ? ? ?// Event manager
? bool done = false; ? ? ? ?// Event handler flips it to true
? struct mg_connection *c; ?// Client connection
? mg_mgr_init(&mgr); ? ? ? ?// Initialise event manager
? c = mg_ws_connect(&mgr, s_url, fn, &done, NULL); ? ? // Create client
? while (c && done == false) mg_mgr_poll(&mgr, 1000); ?// Wait for echo
? mg_mgr_free(&mgr); ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? // Deallocate resources
? return 0;
}
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