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base repository: modelcontextprotocol/python-sdk
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head repository: brian316/python-sdk
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  • 1 commit
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Commits on Dec 5, 2025

  1. fix(server): Remove redundant transport termination to prevent race c… 

    …ondition

Resolves a race condition in the `StreamableHTTPSessionManager` that caused an `anyio.ClosedResourceError` when handling requests in stateless mode.

The `_handle_stateless_request` function was explicitly calling `await http_transport.terminate()` after processing a request. This created a race condition where the transport's streams could be closed while still being used by the background `message_router` task, leading to a crash.

The lifecycle of the transport's streams is already correctly managed by the `async with http_transport.connect()` context manager, which ensures that all resources are safely cleaned up in its `finally` block when the background task completes.

This commit removes the redundant and problematic `terminate()` call, allowing the context manager to handle resource cleanup as intended. This fixes the race condition and improves the stability of stateless request handling.
    @brian316
    brian316 authored Dec 5, 2025
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