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Streamable HTTP resumability + redelivery + SSE polling via server-side disconnect (#1077)

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Co-authored-by: Stephen Halter <halter73@gmail.com>
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Mackinnon Buck 2026-01-14 22:54:25 -08:00 • committed by GitHub
commit b8311756b4
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1 changed files with 2675 additions and 246 deletions
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24
src/ModelContextProtocol.Core/McpSessionHandler.cs
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@ -29,16 +29,38 @@ internal sealed partial class McpSessionHandler : IAsyncDisposable
"mcp.server.operation.duration", "MCP request or notification duration as observed on the receiver from the time it was received until the result or ack is sent.");
/// <summary>The latest version of the protocol supported by this implementation.</summary>
internal const string LatestProtocolVersion = "2025-06-18";
internal const string LatestProtocolVersion = "2025-11-25";
/// <summary>All protocol versions supported by this implementation.</summary>
internal static readonly string[] SupportedProtocolVersions =
[
"2024-11-05",
"2025-03-26",
"2025-06-18",
LatestProtocolVersion,
];
/// <summary>
/// Checks if the given protocol version supports priming events.
/// </summary>
/// <param name="protocolVersion">The protocol version to check.</param>
/// <returns>True if the protocol version supports resumability.</returns>
/// <remarks>
/// Priming events are only supported in protocol version &gt;= 2025-11-25.
/// Older clients may crash when receiving SSE events with empty data.
/// </remarks>
internal static bool SupportsPrimingEvent(string? protocolVersion)
{
const string MinResumabilityProtocolVersion = "2025-11-25";
if (protocolVersion is null)
{
return false;
}
return string.Compare(protocolVersion, MinResumabilityProtocolVersion, StringComparison.Ordinal) >= 0;
}
private readonly bool _isServer;
private readonly string _transportKind;
private readonly ITransport _transport;