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

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
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Copilot 2026-02-18 22:18:00 -05:00 • committed by GitHub
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5
src/ModelContextProtocol.Core/McpSessionHandler.cs
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@ -31,7 +31,10 @@ internal sealed partial class McpSessionHandler : IAsyncDisposable
/// <summary>The latest version of the protocol supported by this implementation.</summary>
internal const string LatestProtocolVersion = "2025-11-25";
/// <summary>All protocol versions supported by this implementation.</summary>
/// <summary>
/// All protocol versions supported by this implementation.
/// Keep in sync with s_supportedProtocolVersions in StreamableHttpHandler.
/// </summary>
internal static readonly string[] SupportedProtocolVersions =
[
"2024-11-05",