I’m building a FastAPI server that communicates with a Flet front-end via WebSocket. I need the server to detect if the client disconnects improperly (e.g., the app crashes or the network connection is lost).

I tried this code:

while str(websocket.application_state) == 'WebSocketState.CONNECTED':
   pass # do something

But the while loop never finished even when I closed the app improperly myself.

What should I do?

Thanks!