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Title: fix: add warning log when session ID is unknown or expired by haroldfabla2-hue · Pull Request #2230 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: add warning log when session ID is unknown or expired by haroldfabla2-hue · Pull Request #2230 · modelcontextprotocol/python-sdk

X Title: fix: add warning log when session ID is unknown or expired by haroldfabla2-hue · Pull Request #2230 · modelcontextprotocol/python-sdk

Description: Summary Adds a logger.warning() call in the else branch of StreamableHTTPSessionManager._handle_stateful_request() when a request arrives with an unknown or expired session ID. Problem The other two branches in this method already log: logger.debug("Session already exists for session ID ...") logger.info("Created new transport for session ...") But the else branch (unknown/expired session) returns a 404 silently, making it difficult to diagnose why connections are failing — especially after server restarts when clients send stale mcp-session-id headers. Change Added logger.warning() with the rejected session ID to help operators identify stale session issues. Closes #2204

Open Graph Description: Summary Adds a logger.warning() call in the else branch of StreamableHTTPSessionManager._handle_stateful_request() when a request arrives with an unknown or expired session ID. Problem The other tw...

X Description: Summary Adds a logger.warning() call in the else branch of StreamableHTTPSessionManager._handle_stateful_request() when a request arrives with an unknown or expired session ID. Problem The other tw...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2230

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ed2141b fix: add warning log for unknown/expired session ID in _handle_statef… Mar 6, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2230/commits/ed2141bd3debf79630267ed15f294da791528a66
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