streamable: validate Mcp-Protocol-Version header matches body protocolVersion on initialize#974
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…lVersion on initialize
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Summary
Fix #963
The Streamable HTTP server now validates that the Mcp-Protocol-Version header matches the protocolVersion field in the initialize request body. Previously, mismatched versions were silently accepted.
Changes
Testing
go test ./mcp/ -run TestStreamableServerTransport/protocol_version_mismatch -v
PASS