CORS implemented in a static manner: unable to configure on another machine

frontend/src/services/websocket.ts

@@ -14,7 +14,8 @@ class WebSocketService {
 
         this.currentSessionId = sessionId;
         this.currentClientId = clientId;
-        const wsUrl = `ws://localhost:8000/sessions/${sessionId}`;
+        const apiUrl = process.env.REACT_APP_API_URL || 'ws://localhost:8000';
+        const wsUrl = `${apiUrl.replace(/^http/, 'ws')}/sessions/${sessionId}`;
         this.ws = new WebSocket(wsUrl);
 
         this.ws.onopen = () => {