Don't conflate request and response IDs in Streamable HTTP transports#475
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halter73 merged 3 commits intomodelcontextprotocol:mainfrom Jun 3, 2025
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stephentoub
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Jun 3, 2025
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This fixes a bug that's well described by #464 where the both the server and client Streamable HTTP transports improperly closed Streamable HTTP SSE response body streams early when it observed a server-to-client JsonRpcRequest, like a sampling request, with a message ID matching the ongoing client-to-server JsonRpcRequest.
This PR updates the server and client Streamable HTTP transports to only close the SSE response body stream when they observe a JsonRpcResponse or JsonRpcError with a matching ID.
Thanks @mkeeley-tricentis for the excellent issue that pointed directly to the problematic server-side code.