Flask-SocketIO handshake fails

Question

I'm new with Flask-SocketIO and I'm struggling to set up Socket IO connection between my Flask server and my Javascript (React) client.

Anyhow, I was not able to set up the connection and start to emit messages. This is what log says:

127.0.0.1 - - [20/Aug/2018 15:33:03] "GET /socket.io/?EIO=3&transport=polling&t=MLNKwf9 HTTP/1.1" 200 381 0.000659 127.0.0.1 - - [20/Aug/2018 15:33:03] "POST /socket.io/?EIO=3&transport=polling&t=MLNKwfK HTTP/1.1" 400 218 0.000203

These log messages recur on every 5 seconds.

Here's my code in back-end:

app = Flask(__name__, static_url_path=None) socket_io = SocketIO(app) @socket_io.on('connect', namespace='/chat') def test_connect(): print('connected')

And in client side:

import SocketIOClient from 'socket.io-client';

and in constructor I do this:

const uri = `http://${localhost}:5000/api/v1.0/chat`; this.socket = SocketIOClient(uri);

What do I wrong?

Any help would be appreciated!

Moyote · Accepted Answer · 2018-08-21 09:47:58Z

In case anyone faces the similar problem, I was able to resolve this by myself.

Problem was that since my client is React Native app, I needed to modify my client code like this:

window.navigator.userAgent = 'ReactNative'; const io = require('socket.io-client/dist/socket.io'); const connectionConfig = { jsonp: false, reconnection: true, reconnectionDelay: 100, reconnectionAttempts: 100000, transports: ['websocket'], // you need to explicitly tell it to use websockets }; const socket = io(path, connectionConfig);

This thread provided the answer: https://gist.github.com/ekryski/59eb6ce5b2774fa24d15

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