Profile socket flush behavior

[willscott]

the generated server is agressive in flushing the write stream, e.g. here.

This may result in tcp packets being sent with just header information, since flush is called, and result in double the http framing overhead.

Do we need the immediate flush of headers in the case that a result can be provided on the channel in a synchronous fashion? is there a way to only flush headers after a few milliseconds if an immediate result is not forthcoming from the handler?

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