Prompt for Websocket URI on page load until we get one.

src/main.js

@@ -1,6 +1,29 @@
 import Vue from 'vue';
 import App from './App.vue';
+import VueSocketIO from 'vue-socket.io';
 
 Vue.config.productionTip = false;
 
+let qs = new URLSearchParams(window.location.search);
+let ws_uri;
+if (qs.get(`ws-uri`)) {
+	ws_uri = qs.get(`ws-uri`)
+	if (!ws_uri.match(/^(wss?|https?):\/\//)) {
+		ws_uri = `ws://${ws_uri}`;
+	};
+} else {
+	ws_uri = ``
+}
+
+// http://localhost:8080/?ws-uri=localhost:3000
+
+while (ws_uri.length == 0 || !ws_uri.match(/^(wss?|https?):\/\//)) {
+	ws_uri = prompt("Input a websocket URI to connect to");
+}
+
+Vue.use(new VueSocketIO({
+	debug: true,
+	connection: ws_uri
+}))
+
 new Vue({render: h => h(App)}).$mount('#app');