Stack Overflow Asked on December 11, 2021
I am trying to deploy a Flask Socket.io app on Azure App Services. Locally everything works fine. However, when deploying on Azure I get a 400 code error:
WebSocket connection to
‘wss://mydomain.azurewebsites.net/socket.io/?EIO=3&transport=websocket’
failed: Error during WebSocket handshake: Unexpected response code:
400
My server side looks like this:
from flask import Flask, render_template
from flask_socketio import SocketIO, emit
app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
app.config['DEBUG'] = True
socketio = SocketIO(app,engineio_logger=False,log_output=False,async_mode='eventlet')
@socketio.on('btn_speaker')
def btn_agent(message):
print(message)
agent = message['speaker_msg']
webchat = "speaker says: " + agent
socketio.emit( 'webchat', {'webchat': webchat} )
@app.route('/')
def test():
return render_template('test.html')
if __name__ == '__main__':
socketio.run(app)
and the client:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Socket.io test</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.3.0/socket.io.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js"></script>
<script>
$(document).ready(function() {
<!-- var socket = io.connect(location.protocol + '//' + document.domain + ':' + location.port); -->
var socket = io({transports: ['websocket']});
$('#btn_speaker').click(function(e) {
socket.emit( 'btn_speaker', {
speaker_msg : $( 'input.speaker' ).val()
} )
$( 'input.speaker' ).val( '' ).focus()
} )
socket.on( 'webchat', function( msg ) {
console.log( msg )
$('#webchat').html(msg.webchat)
})
})
</script>
</head>
<body>
<textarea id="webchat" name="webchat" rows="20" cols="100"></textarea>
<label for="speaker">text:</label>
<input type="text" class="speaker" id="speaker" name="speaker" autocomplete="off">
<button type="submit" id="btn_speaker">Submit speaker</button>
</body>
</html>
requirements.txt:
eventlet
Flask-SocketIO
Two points I had to consider in order to get this to work:
--worker-class eventlet to the gunicorn startup command in Azure enabled browsing and controlling the url from different instancesAnswered by Christian on December 11, 2021
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