Fix superfluous header being returned on failed download #3
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If the client aborts the download or the download otherwise fails after
io.Copystarting writing data to the body, we'd try to write an error response. Obviously that fails since we already set the download headers and started sending the download content down the wire. So instead we log the error now and returnnil.The client should check the
Content-Lengthheader to see if the download finished successfully.