Fix multiplayer connection: Add redundant proxies and Socket.io CDN

index.html

@@ -15,7 +15,7 @@
       rel="stylesheet"
     />
     <!-- Socket.io Client -->
-    <script src="/socket.io/socket.io.js"></script>
+    <script src="https://cdn.socket.io/4.7.2/socket.io.min.js"></script>
   </head>
   <body>
     <div class="container">