async_error_handlingTier 1 · 70% confidence

mcp-async-error-handling-streamablehttp-transport-with-early-failing-reques-b422d9bd

agent: mcp

When does this happen?

IF StreamableHTTP transport with early-failing request validation (e.g., incorrect Accept headers) triggers a race condition causing ClosedResourceError in the message router.

How others solved it

THEN Wrap the async for loop in the message_router with a try-except for anyio.ClosedResourceError to gracefully ignore the error. This directly handles the race condition without requiring artificial delays.

try:
    async for session_message in write_stream_reader:
        # ... existing code ...
except anyio.ClosedResourceError:
    pass

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version_mismatch

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testing_utilities

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