Validate MCP-Protocol-Version header in Streamable HTTP handler#1277

Merged

stephentoub merged 10 commits intomainfrom

copilot/validate-mcp-protocol-header

Feb 19, 2026

Commits on Feb 15, 2026

Initial plan
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Validate MCP-Protocol-Version header in StreamableHttpHandler

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stephentoub
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Address PR feedback: move SupportedProtocolVersions to ProtocolVersions class, use nullable out param

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stephentoub
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Remove public ProtocolVersions class; use InternalsVisibleTo instead

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stephentoub
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Remove InternalsVisibleTo; use local HashSet for protocol version validation

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stephentoub
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Merge branch 'main' into copilot/validate-mcp-protocol-header
stephentoub
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Move SupportedProtocolVersions to McpServer as instance member

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stephentoub
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Fix DELETE handler: validate protocol version before removing session

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stephentoub
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Change SupportedProtocolVersions from ICollection<string> to IReadOnlyList<string>

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stephentoub
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Commits on Feb 18, 2026

Revert SupportedProtocolVersions public API; use private list with sync comments

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stephentoub
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