Unable to do Websocket Connection

Question

Hi, im trying to do a simple app using websocket and trying to test it with an online client tester https://piehost.com/websocket-tester, below are my code:

```const PORT = process.env.PORT || 3003;
const PUBLIC_DOMAIN = process.env.RAILWAY_PUBLIC_DOMAIN;
const httpsServer = https.createServer(app);

const webSocketServer = new WebSocket.Server({ port: PORT })

httpsServer.listen(() =>
{
    console.log(`Server running on port ${PORT}`);
    console.log(`WebSocket URL: wss://${PUBLIC_DOMAIN}`);
});```

When i tried to connect to the url `wss://.....railway.app` as pasted below it simply said i failed.
Many thanks! Im on the Free Trial plan also.