return req.ContentLength
	}
	return -1
}

func (cc *http2ClientConn) decrStreamReservations() {
	cc.mu.Lock()
	defer cc.mu.Unlock()
	cc.decrStreamReservationsLocked()
}

func (cc *http2ClientConn) decrStreamReservationsLocked() {
	if cc.streamsReserved > 0 {
		cc.streamsReserved--
	}
}

func (cc *http2ClientConn) RoundTrip(req *Request) (*Response, error) {