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Brad Fitzpatrick authored
The Transport's writer to the remote server is wrapped in a bufio.Writer to suppress many small writes while writing headers and trailers. However, when writing the request body, the buffering may get in the way if the request body is arriving slowly. Because the io.Copy from the Request.Body to the writer is already buffered, the outer bufio.Writer is unnecessary and prevents small Request.Body.Reads from going to the server right away. (and the io.Reader contract does say to return when you've got something, instead of blocking waiting for more). After the body is finished, the Transport's bufio.Writer is still used for any trailers following. A previous attempted fix for this made the chunk writer always flush if the underlying type was a bufio.Writer, but that is not quite correct. This CL instead makes it opt-in by using a private sentinel type (wrapping a *bufio.Writer) to the chunk writer that requests Flushes after each chunk body (the chunk header & chunk body are still buffered together into one write). Fixes #6574 Change-Id: Icefcdf17130c9e285c80b69af295bfd3e72c3a70 Reviewed-on: https://go-review.googlesource.com/10021Reviewed-by:
Andrew Gerrand <adg@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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