This patch was authored by @adam-fowler and released by @0xTim.
This changes the default for HTTPServer.Configuration.supportPipelining from false to true. This ensures the order HTTP responses are output from a channel is the same as the order the related requests were received. This is expected of a server that is HTTP/1.1 compliant.
This change does have a performance impact , approx 8% on a server returning "Hello" and nothing else. I would expect on a server that is doing real work like talking to a database the impact would be minimal.
To disable pipelining you can do
app.http.server.configuration.supportPipelining = false