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In a Flask app using SocketIO, what happens when the server emits an event to clients?

medium📝 component behavior Q5 of 15
Flask - WebSocket and Real-Time
In a Flask app using SocketIO, what happens when the server emits an event to clients?
AThe server waits for clients to request the event.
BClients ignore the event until they refresh the page.
CClients receive the event instantly and can update their UI.
DThe event is stored but never sent to clients.
Step-by-Step Solution
Solution:

  1. Step 1: Understand SocketIO event emission

    When the server emits an event, connected clients get it immediately and can react.

  2. Step 2: Review other options

    Options A, B, and D describe incorrect behaviors that do not match SocketIO's push model.

  3. Final Answer:

    Clients receive the event instantly and can update their UI. -> Option C

  4. Quick Check:

    SocketIO event emission = Instant client update [OK]
Quick Trick: Server emits = clients get event instantly [OK]
Common Mistakes:
MISTAKES
  • Thinking clients must refresh to get events
  • Believing server waits for client requests

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