"failed: error during websocket handshake: unexpected response code: 400" Code Answer's

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failed: error during websocket handshake: unexpected response code: 400

Santino on Mar 02, 2021

Problem solved! I just figured out how to solve the issue, but I would still like to know if this is normal behavior or not.

It seems that even though the Websocket connection establishes correctly (indicated by the 101 Switching Protocols request), it still defaults to long-polling. The fix was as simple as adding this option to the Socket.io connection function:

{transports: ['websocket']}
So the code finally looks like this:

const app = express();
const server = http.createServer(app);
var io = require('socket.io')(server);

io.on('connection', function(socket) {
  console.log('connected socket!');

  socket.on('greet', function(data) {
    console.log(data);
    socket.emit('respond', { hello: 'Hey, Mr.Client!' });
  });
  socket.on('disconnect', function() {
    console.log('Socket disconnected');
  });
});

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error during websocket handshake: unexpected response code: 502

Santino on Mar 09, 2021

I got this error when I forgot to start my server. So make sure the server is running :)

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"failed: error during websocket handshake: unexpected response code: 400" Code Answer's

failed: error during websocket handshake: unexpected response code: 400

error during websocket handshake: unexpected response code: 502

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