Can the server be used with another client?

[kolserdav]

I can't connect to socket.io server via browser native class WebSocket.

To Reproduce

Create basic socket.io Hello world and simple new WebSocket() connection in browser

Socket.IO server version: 4.5.1

Server

import express from 'express';
import http from 'http';
import { Server } from 'socket.io';

const app = express();

app.get('/', (req, res) => {
  res.send('<h1>Hello world</h1>');
});

const server = http.createServer(app);

const io = new Server(server);

io.on('connection', (socket) => {
  console.log('a user connected');
});

server.listen(parseInt(SERVER_PORT, 10), () => {
  console.log('listening on port', SERVER_PORT);
});

Socket.IO client version: none

Client

const connection = new WebSocket(
      `${window.location.protocol === 'https' ? 'wss' : 'ws'}://${process.env.REACT_APP_SERVER}:${
        process.env.REACT_APP_PORT
      }`,
      'json'
    );

Expected behavior
A clear and concise description of what you expected to happen.

Platform:

• Device: [Desktop]
• OS: [Arch Linux]

Additional context

• node.js [16.13.0]

[darrachequesne]

No, you won't be able to connect via plain WebSocket.

Reference: https://socket.io/docs/v4/#what-socketio-is-not

[kolserdav]

Thank You🙏