fix(connection): register protocol callback only after successful send - #3167
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Simon Knott (Skn0tt) merged 2 commits intoAug 5, 2026
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Fixes one of the two cases of microsoft#3165 Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 358aa828-ed44-482a-8a83-91d435d25b38
The sync subprocess test already covers the user-visible warning. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 358aa828-ed44-482a-8a83-91d435d25b38
Devin Rousso (dcrousso)
approved these changes
Aug 4, 2026
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If
transport.sendfails (e.g. non-JSON-serializable params), we used to leave aProtocolCallbacksitting inconnection._callbacks.cleanup()laterset_exceptions on it, and nobody awaits it →Future exception was never retrieved.Fix is to register the callback only after a successful send.
Fixes one of the two cases of #3165