mongoose/docs/c-api/http.h/mg_connect_ws.md

title	decl_name	symbol_kind	signature
mg_connect_ws()	mg_connect_ws	func	struct mg_connection *mg_connect_ws(struct mg_mgr *mgr, mg_event_handler_t event_handler, const char *url, const char *protocol, const char *extra_headers);

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:

  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);