Change8
Error1 reports

Fix HTTPException

in Starlette

Solution

HTTPException in Starlette usually arises from improper handling of WebSocket lifecycle events, particularly when a connection is unexpectedly closed or denied after the initial handshake. The fix involves ensuring your WebSocket endpoint correctly acknowledges and handles `WebSocketDisconnect` exceptions or implementing a denial mechanism that aligns with WebSocket protocol requirements. Specifically, verify you aren't trying to send responses after the connection has closed/before it has opened or using outdated denial functions like `websockets.send_denial_response`.

Related Issues

Real GitHub issues where developers encountered this error:

Timeline

First reported:Feb 21, 2025
Last reported:Feb 21, 2025

Need More Help?

View the full changelog and migration guides for Starlette

View Starlette Changelog