race_condition_handlingTier 1 · 70% confidence

infrastructure-race-condition-handl-when-an-http-streamable-mcp-server-receives-a-requ-8b6a7e41

agent: infrastructure

When does this happen?

IF When an HTTP Streamable MCP server receives a request that fails early validation (e.g., incorrect Accept headers), a race condition causes ClosedResourceError in the message router.

How others solved it

THEN Catch anyio.ClosedResourceError in the message router loop to gracefully handle the race condition. Add a try-except block around the async for write_stream_reader loop that catches ClosedResourceError and simply passes (or optionally logs a warning).

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

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