Python implementation of the Socket.IO realtime server.
- Fully compatible with the Javascript socket.io-client library.
- Compatible with Python 2.7 and Python 3.3+.
- Based on Eventlet, enabling large number of clients even on modest hardware.
- Includes a WSGI middleware that integrates Socket.IO traffic with standard WSGI applications.
- Uses an event-based architecture implemented with decorators that hides the details of the protocol.
- Implements HTTP long-polling and WebSocket transports.
- Supports XHR2 and XHR browsers as clients.
- Supports text and binary messages.
- Supports gzip and deflate HTTP compression.
- Configurable CORS responses to avoid cross-origin problems with browsers.
The following application uses Flask to serve the HTML/Javascript to the client:
import socketio import eventlet from flask import Flask, render_template sio = socketio.Server() app = Flask(__name__) @app.route('/') def index(): """Serve the client-side application.""" return render_template('index.html') @sio.on('connect', namespace='/chat') def connect(sid, environ): print("connect ", sid) @sio.on('chat message', namespace='/chat') def message(sid, data): print("message ", data) sio.emit(sid, 'reply') @sio.on('disconnect', namespace='/chat') def disconnect(sid): print('disconnect ', sid) if __name__ == '__main__': # wrap Flask application with engineio's middleware app = socketio.Middleware(eio, app) # deploy as an eventlet WSGI server eventlet.wsgi.server(eventlet.listen(('', 8000)), app)