Flask - WebSocket and Real-Time
What is wrong with this Flask-SocketIO server code snippet?
```python
@socketio.on('connect')
def on_connect():
socketio.emit('welcome', {'msg': 'Hi'})
return 'Connected'
```
What is wrong with this Flask-SocketIO server code snippet? ```python @socketio.on('connect') def on_connect(): socketio.emit('welcome', {'msg': 'Hi'}) return 'Connected' ```
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Understand connect event handler rules
Connect handlers should not return values; return is ignored or causes error.Step 2: Check emit call and decorator
Emit call is correct with event name and data; decorator @socketio.on('connect') is correct.Final Answer:
Returning a value in connect handler is invalid -> Option BQuick Check:
Connect handlers must not return values [OK]
Quick Trick: Do not return values from connect event handlers [OK]
Common Mistakes:
MISTAKES- Returning from connect handler
- Using wrong decorators
- Assuming function names are fixed
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