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MihaZupan avatar MihaZupan commented on August 16, 2024 1

Thank you for the great repro project!

This does appear to be a YARP issue where we're not flushing the response headers until we receive some content.
Relevant section:

reverse-proxy/src/ReverseProxy/Forwarder/HttpForwarder.cs

Lines 269 to 280 in 8b53dac

// NOTE: it may *seem* wise to call `context.Response.StartAsync()` at this point
// since it looks like we are ready to send back response headers
// (and this might help reduce extra delays while we wait to receive the body from the destination).
// HOWEVER, this would produce the wrong result if it turns out that there is no content
// from the destination -- instead of sending headers and terminating the stream at once,
// we would send headers thinking a body may be coming, and there is none.
// This is problematic on gRPC connections when the destination server encounters an error,
// in which case it immediately returns the response headers and trailing headers, but no content,
// and clients misbehave if the initial headers response does not indicate stream end.
// :: Step 7-B: Copy response body Client ◄-- Proxy ◄-- Destination
var (responseBodyCopyResult, responseBodyException) = await CopyResponseBodyAsync(destinationResponse.Content, context.Response.Body, activityCancellationSource);

from reverse-proxy.

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