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

Santino answered on March 2, 2021 Popularity 8/10 Helpfulness 3/10

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

related error during websocket handshake: unexpected response code: 502

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

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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');
  });
});

Popularity 8/10 Helpfulness 3/10 Language whatever

Source: Grepper

Tags: response websocket whatever

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Contributed on Mar 02 2021

Santino

0 Answers Avg Quality 2/10

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error during websocket handshake: unexpected response code: 502

Comment

-1

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

Popularity 9/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: response respons

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Contributed on Mar 09 2021

Santino

0 Answers Avg Quality 2/10

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

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