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Which Flask-SocketIO function call correctly broadcasts a message to all connected clients?

easy📝 Conceptual Q2 of 15
Flask - WebSocket and Real-Time
Which Flask-SocketIO function call correctly broadcasts a message to all connected clients?
Asocketio.send('event', data, broadcast=True)
Bsocketio.emit('event', data, broadcast=True)
Csocketio.emit('event', data, room='all')
Dsocketio.send('event', data, room='all')
Step-by-Step Solution
Solution:

  1. Step 1: Identify the correct method

    Flask-SocketIO uses emit to send named events.

  2. Step 2: Use broadcast parameter

    Setting broadcast=True sends the event to all clients.

  3. Step 3: Analyze options

    socketio.emit('event', data, broadcast=True) uses emit with broadcast=True, which is correct.

  4. Final Answer:

    socketio.emit('event', data, broadcast=True) -> Option B

  5. Quick Check:

    Use emit with broadcast=True for all clients [OK]
Quick Trick: Use emit() with broadcast=True to reach all clients [OK]
Common Mistakes:
MISTAKES
  • Using send() instead of emit() for named events
  • Using room='all' which is invalid
  • Omitting broadcast=True parameter

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