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Fix HttpClient timeout for long-running tools without event stream store (#1268)

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: halter73 <54385+halter73@users.noreply.github.com>
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Copilot 2026-02-14 10:19:53 -05:00 • committed by GitHub
commit fb2daf2f0d
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1 changed files with 172 additions and 41 deletions
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7
src/ModelContextProtocol.Core/Server/StreamableHttpPostTransport.cs
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@ -74,6 +74,13 @@ internal sealed partial class StreamableHttpPostTransport(
{
await _httpSseWriter.WriteAsync(primingItem.Value, cancellationToken).ConfigureAwait(false);
}
else
{
// If there's no priming write, flush the stream to ensure HTTP response headers are
// sent to the client now that the server is ready to process the request.
// This prevents HttpClient timeout for long-running requests.
await responseStream.FlushAsync(cancellationToken).ConfigureAwait(false);
}
// Ensure that we've sent the priming event before processing the incoming request.
await parentTransport.MessageWriter.WriteAsync(message, cancellationToken).ConfigureAwait(false);