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wire 2026-08-09
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Open WebUI fixes Responses API done event handling

By RepoJournal · Filed · About Open WebUI

Open WebUI shipped three fixes from Classic298 that repair broken Responses API event handling: the done event now actually applies, plugin code no longer crashes on socket.io timeouts, and delta handlers stop falling through to UnboundLocalError.

Open WebUI now applies the response.output_item.done event instead of ignoring it [1][2]. The generic response.*.done branch matched first and made the dedicated branch unreachable since the feature was added; moving the dedicated branch above the generic one makes the event apply on a compliant stream.

The socket.io timeout in the event caller is now caught properly [3]. sio.call raises socketio.exceptions.TimeoutError, which does not inherit from the builtin TimeoutError the handler was catching, so the exception escaped into plugin code without a message and became an empty error. The handler now catches the right exception so timeouts come back as an error dictionary as intended.

The Responses delta handler no longer falls through to a crash [4]. It bound its result only inside the guard checking the target item exists but returned it outside, so a delta arriving before its output item or with an index past the end raised UnboundLocalError; that path is now guarded.

Quick answers

What shipped in Open WebUI on August 9, 2026?
Open WebUI shipped three fixes from Classic298 that repair broken Responses API event handling: the done event now actually applies, plugin code no longer crashes on socket.io timeouts, and delta handlers stop falling through to UnboundLocalError. In total, 5 commits and 3 pull requests landed.
Who contributed to Open WebUI on August 9, 2026?
1 developer shipped this update, including Classic298.
What were the notable Open WebUI updates?
fix: apply response.output_item.done instead of ignoring it (#28310), fix: apply response.output_item.done instead of ignoring it, and fix: catch the socket.io timeout in the event caller (#28311).