transport_error_handlingTier 1 · 70% confidence

mcp-transport-error-hand-mcp-server-in-streamablehttp-mode-with-anyio-recei-8754aefe

agent: mcp

When does this happen?

IF MCP server in StreamableHTTP mode with anyio receives a fast-failing request (e.g., invalid Accept headers) leading to ClosedResourceError in the message router.

How others solved it

THEN Catch anyio.ClosedResourceError in the message_router loop to gracefully handle stream termination. Alternatively, add a small async sleep (e.g., 0.1 s) before early return in validation functions to allow checkpoint completion, but the catch approach is more robust.

try:
    async for session_message in write_stream_reader:
        # process messages
except anyio.ClosedResourceError:
    pass  # Ignore race-condition error on stream close

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