Clients can't connect to socket server

Screenshot GraphiQL uRQL Client - Console

Expected Behaviour I expected it to do connect the socket server.

Actual Behaviour but instead it did give me error without any response.

Setup For server, I am using ExpressJS with GraphQL-Helix/Envelop

// initial setup with cookies, form data etc.
const server = app.listen(PORT, () => {
    const wsServer = new WebSocketServer({
      path: "/graphql",
      server,
    });

const { execute, subscribe } = getEnveloped({});

useServer(
      {
        execute,
        subscribe,
        onError: writeError,
        onSubscribe: async (ctx, msg) => {
              // this is never called
              // on error is also never called (it is only a logger)

In the error message in console above, the response is undefined. I also tried doing it noServer:true, still I got the same error.

[ragokan]

Well, let me close the issue for now because it is probably something to do with Heroku or my code, if anybody else got the same error, can always write here.

@enisdenjo Thank you so much for helping that fast.

[enisdenjo]

Ok weird. This error looks like theres a problem with the network, can you confirm you’re using the right URL on the clients (and that the server is available)? Is the server on the same local network? Can you provide me a screenshot of the WebSocket request from your browsers DevTools?

I would greatly appreciate a repro too, thanks!