Disable response buffering for SSE responses #208
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halter73
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stephentoub
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Apr 4, 2025
src/ModelContextProtocol.AspNetCore/McpEndpointRouteBuilderExtensions.cs
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stephentoub
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Apr 4, 2025
This was referenced Jul 24, 2025
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This does the same thing SignalR's ServerSentEventsServerTransport and Blazor's RazorComponentEndpointInvoker does. We didn't catch this before because we test using Kestrel which does not buffer by default.
It's possible to either mock the IHttpResponseBodyFeature or use IIS in integration tests to fully test this fix, but I don't think it's worth the effort right now as I work on other parts of HTTP streaming. I did add test verifying we send the expected headers though.