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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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src/ModelContextProtocol.Core/Server/StreamableHttpPostTransport.cs
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@ -22,7 +22,9 @@ internal sealed partial class StreamableHttpPostTransport(
private readonly SseEventWriter _httpSseWriter = new(responseStream);
private TaskCompletionSource<bool>? _storeStreamTcs;
#pragma warning disable MCP9006 // Stateful Streamable HTTP resumability types are obsolete but still wired up internally.
private ISseEventStreamWriter? _storeSseWriter;
#pragma warning restore MCP9006
private RequestId _pendingRequest;
private bool _finalResponseMessageSent;
@ -176,7 +178,9 @@ internal sealed partial class StreamableHttpPostTransport(
// Set the mode to 'Polling' so that the replay stream ends as soon as all available messages have been sent.
// This prevents the client from immediately establishing another long-lived connection.
#pragma warning disable MCP9006 // Stateful Streamable HTTP resumability types are obsolete but still wired up internally.
await _storeSseWriter.SetModeAsync(SseEventStreamMode.Polling, cancellationToken).ConfigureAwait(false);
#pragma warning restore MCP9006
// Signal completion so HandlePostAsync can return.
_httpResponseTcs.TrySetResult(true);