Qemu websocket for VNC

[joconcepts]

I want to write a little proxy for accessing the vnc console of qemu via websocket. Qemu starts the websocket on its own, so its just a simple proxy.

When connecting to the proxy url via noVNC I get the following message:

websocketproxy: couldn't dial to remote backend url unexpected EOF

My code looks as follows:

func ConsoleHandler(w http.ResponseWriter, r *http.Request) {
	port, _ := "5700"
	proxy_url := fmt.Sprintf("http://localhost:%d", port)
        p_u, _ := url.Parse(proxy_url)

	if strings.ToLower(r.Header.Get("Connection")) == "upgrade" {
		p_u_ws, _ := url.Parse(strings.Replace(proxy_url, "http", "ws", 1))
		websocketproxy.NewProxy(p_u_ws).ServeHTTP(w, r)
		return
	}
	httputil.NewSingleHostReverseProxy(p_u).ServeHTTP(w, r)
}

func main() {
	r := mux.NewRouter()
	r.HandleFunc("/", ConsoleHandler)

	srv := &http.Server{
		Handler: r,
		Addr:    "127.0.0.1:10001",
	}
	log.Fatal(srv.ListenAndServe())
}

Can anybody give me some hint why that will not work?

[cihangir]

Seems like your handler is problematic. NewProxy already handles the upgrades and other stuff.

func main() {
        port, _ := "5700"
	proxy_url := fmt.Sprintf("http://localhost:%d", port)
        p_u, _ := url.Parse(proxy_url) // handle the errors

	r := mux.NewRouter()
	r.Handle("/", websocketproxy.NewProxy(p_u))

	srv := &http.Server{
		Handler: r,
		Addr:    "127.0.0.1:10001",
	}
	log.Fatal(srv.ListenAndServe())
}

Please see the example in readme.