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Add X-Accel-Buffering header to SSE responses (#1294)

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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>
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Copilot 2026-02-17 16:03:10 -05:00 • committed by GitHub
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11
tests/ModelContextProtocol.AspNetCore.Tests/StreamableHttpServerConformanceTests.cs
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@ -92,6 +92,17 @@ public class StreamableHttpServerConformanceTests(ITestOutputHelper outputHelper
Assert.Equal("text/event-stream", Assert.Single(response.Content.Headers.GetValues("content-type")));
}
[Fact]
public async Task SseResponse_Includes_XAccelBufferingHeader()
{
await StartAsync();
using var response = await HttpClient.PostAsync("", JsonContent(InitializeRequest), TestContext.Current.CancellationToken);
Assert.Equal(HttpStatusCode.OK, response.StatusCode);
Assert.Equal("text/event-stream", response.Content.Headers.ContentType?.MediaType);
Assert.Equal("no", Assert.Single(response.Headers.GetValues("X-Accel-Buffering")));
}
[Fact]
public async Task PostRequest_IsUnsupportedMediaType_WithoutJsonContentType()
{