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pypi / sse-starlette

sse-starlette

What changed in sse-starlette 3, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-18.

1 breaking2 fixes and other

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@unstale/cli on npm

sse-starlette 33 changes

Breaking changes 1

  • In the fallback path, sse-starlette no longer sets this when it detects uvicorn's Server.should_exit; streams still close on shutdown. Use shutdown_event to detect shutdown.

    3.5.0release notes

Fixes and other changes 2

  • Stopping a uvicorn server no longer cancels SSE streams belonging to later servers in the same process.

    3.5.0release notes

  • The send timeout now also applies to heartbeat messages.

    3.4.10release notes