}
func testTransportCancelRequestBeforeResponseHeaders(t *testing.T, test cancelTest) {
	defer afterTest(t)

	serverConnCh := make(chan net.Conn, 1)
	tr := &Transport{
		Dial: func(network, addr string) (net.Conn, error) {
			cc, sc := net.Pipe()
			serverConnCh <- sc
			return cc, nil
		},
	}
	defer tr.CloseIdleConnections()
	errc := make(chan error, 1)