Flask - WebSocket and Real-Time
Which of the following is the correct syntax to define a WebSocket event handler for event 'message' in Flask-SocketIO?
Which of the following is the correct syntax to define a WebSocket event handler for event 'message' in Flask-SocketIO?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Recall the decorator for event handlers
Flask-SocketIO uses@socketio.on('event')to define event handlers.Step 2: Check syntax correctness
@socketio.on('message')\ndef handle_message(data):\n pass correctly uses@socketio.on('message')and defines a function with one parameter for data. Other options use invalid decorators or HTTP route decorators.Final Answer:
@socketio.on('message')\ndef handle_message(data):\n pass -> Option BQuick Check:
Event handler syntax = @socketio.on('event') [OK]
Quick Trick: Use @socketio.on('event') above a function to handle events [OK]
Common Mistakes:
MISTAKES- Using @app.route for WebSocket events
- Using @socketio.emit instead of on
- Using non-existent decorators like @socketio.handle
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