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Default draft protocol support: sessionless + handshake-less (SEP-2575 + SEP-2567) (#1610)

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Stephen Halter 2026-06-23 21:24:22 -07:00 • committed by GitHub
commit 6c323e783b
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1 changed files with 5704 additions and 712 deletions
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5
src/ModelContextProtocol.Core/Server/StreamableHttpServerTransport.cs
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@ -40,7 +40,9 @@ public sealed partial class StreamableHttpServerTransport : ITransport
private readonly ILogger _logger;
private SseEventWriter? _httpSseWriter;
#pragma warning disable MCP9006 // Stateful Streamable HTTP resumability types are obsolete but still wired up internally.
private ISseEventStreamWriter? _storeSseWriter;
#pragma warning restore MCP9006
private TaskCompletionSource<bool>? _httpResponseTcs;
private string? _negotiatedProtocolVersion;
private bool _getHttpRequestStarted;
@ -80,6 +82,7 @@ public sealed partial class StreamableHttpServerTransport : ITransport
/// Gets or sets the event store for resumability support.
/// When set, events are stored and can be replayed when clients reconnect with a Last-Event-ID header.
/// </summary>
[Obsolete(Obsoletions.LegacyStatefulHttp_Message, DiagnosticId = Obsoletions.LegacyStatefulHttp_DiagnosticId, UrlFormat = Obsoletions.LegacyStatefulHttp_Url)]
public ISseEventStreamStore? EventStreamStore { get; init; }
/// <summary>
@ -357,6 +360,7 @@ public sealed partial class StreamableHttpServerTransport : ITransport
}
}
#pragma warning disable MCP9006 // Stateful Streamable HTTP resumability types are obsolete but still wired up internally.
internal async ValueTask<ISseEventStreamWriter?> TryCreateEventStreamAsync(string streamId, CancellationToken cancellationToken)
{
if (EventStreamStore is null || !McpSessionHandler.SupportsPrimingEvent(_negotiatedProtocolVersion))
@ -377,6 +381,7 @@ public sealed partial class StreamableHttpServerTransport : ITransport
return sseEventStreamWriter;
}
#pragma warning restore MCP9006
[LoggerMessage(Level = LogLevel.Warning,
Message = "Sending server-to-client JSON-RPC request '{Method}' over the standalone GET SSE stream (SessionId: '{SessionId}'). " +