// can deadlock if we start writing the response with unconsumed body
	// remaining. See Issue 15527 for some history.
	//
	// If full duplex mode has been enabled with ResponseController.EnableFullDuplex,
	// then leave the request body alone.
	//
	// We don't take this path when w.closeAfterReply is set.
	// We may not need to consume the request to get ready for the next one