req.logf("resc recv: %p, %T/%#v", re.res, re.err, re.err)
		}
		if re.err != nil {
			return nil, pc.mapRoundTripError(req, startBytesWritten, re.err)
		}
		return re.res, nil
	}

	var respHeaderTimer <-chan time.Time
	ctxDoneChan := req.ctx.Done()
	pcClosed := pc.closech
	for {
		testHookWaitResLoop()
		select {
		case err := <-writeErrCh:
			if debugRoundTrip {