Listen on all interfaces, this is a demo after all

main.go

@@ -51,7 +51,7 @@ var upgrader = websocket.Upgrader{
 func main() {
 	http.HandleFunc("/ws/", subscribe)
 	http.HandleFunc("/", serveIndex)
-	log.Fatal(http.ListenAndServe("localhost:9888", nil))
+	log.Fatal(http.ListenAndServe("0.0.0.0:9888", nil))
 }
 func serveIndex(w http.ResponseWriter, r *http.Request) {
 	f, err := os.Open("index.html")