The client is connected fine and can send and receive events, but some times the server doesn't recieve any event and the client is still connected.

The way to reproduce it: Start and stop the client a few times, until it stops receiveing the pong message.

client:

const socket = io("http://localhost:8080");

socket.on("pong", ({ datetime }) => {
    console.log(`Response time (${(Date.now() - datetime)}ms)`)
});

socket.on("connect", () => {
    console.log(`Connected! ${socket.id}`);
    
    setInterval(() => {
        socket.emit('ping', { datetime: Date.now() });
    }, 1000);
});

socket.connect();

server:

const io = new Server();

io.on("connection", (socket) => {
    console.log(`socket ${socket.id} connected`);
    
    socket.on('ping', (data) => {
        console.log(`[${socket.id}]: ping!`)
        socket.emit('pong', data)
    });
});

await serve(io.handler(), {
    port: 8080,
});

Trying to setup Websockets with Deno & IO. Upon establishing connection I'm getting this pesky error - any idea how to fix this?

TypeError: Headers are immutable.
    at Headers.set (deno:ext/fetch/20_headers.js:384:15)
    at https://deno.land/x/[email protected]/packages/engine.io/lib/transports/websocket.ts:60:24
    at Headers.forEach (deno:ext/webidl/00_webidl.js:1001:13)
    at WS.onRequest (https://deno.land/x/[email protected]/packages/engine.io/lib/transports/websocket.ts:59:21)
    at Server.handleRequest (https://deno.land/x/[email protected]/packages/engine.io/lib/server.ts:217:35)
    at async Server.#respond (https://deno.land/[email protected]/http/server.ts:298:18)

Server:

const io = new Server({ cors: { origin: 'http://localhost:3000' } });

io.on('connection', socket => {
  console.log(`Socket ${socket.id} connected`);

  socket.on('disconnect', reason => {
    console.log(`Socket ${socket.id} disconnected due to ${reason}`);
  });
});

await serve(io.handler(), {
  port: 8080,
});

Client:

const socket = io('ws://localhost:8080');

  socket.on('connection', () => {
    console.log('Connection established.');
  });

Needed: https://github.com/denodrivers/mongo/issues/261

Reference: https://socket.io/docs/v4/mongo-adapter/ Node.js impl: https://github.com/socketio/socket.io-mongo-adapter

Needed: https://github.com/denodrivers/postgres/issues/39 (potential workaround: https://deno.land/x/postgresjs)

Reference: https://socket.io/docs/v4/postgres-adapter/ Node.js impl: https://github.com/socketio/socket.io-postgres-adapter