// TLSConfig of the http.Transport
func DialURL(ctx context.Context, url *url.URL, transport http.RoundTripper) (net.Conn, error) {
	dialAddr := netutil.CanonicalAddr(url)

	dialer, err := utilnet.DialerFor(transport)
	if err != nil {
		klog.V(5).Infof("Unable to unwrap transport %T to get dialer: %v", transport, err)
	}

	switch url.Scheme {
	case "http":
		if dialer != nil {
			return dialer(ctx, "tcp", dialAddr)

			tlsConfigCopy.Clone()
			transport := &http.Transport{
				DialContext:     tc.Dial,
				TLSClientConfig: tlsConfigCopy,
			}

			extractedDial, err := utilnet.DialerFor(transport)
			if err != nil {
				t.Fatal(err)
			}
			if fmt.Sprintf("%p", extractedDial) != fmt.Sprintf("%p", tc.Dial) {
				t.Fatalf("%s: Unexpected dial", k)
			}

}

type RoundTripperWrapper interface {
	http.RoundTripper
	WrappedRoundTripper() http.RoundTripper
}

type DialFunc func(ctx context.Context, net, addr string) (net.Conn, error)

func DialerFor(transport http.RoundTripper) (DialFunc, error) {
	if transport == nil {
		return nil, nil
	}

	switch transport := transport.(type) {
	case *http.Transport:

- api-machinery utility functions `SetTransportDefaults` and `DialerFor` once again respect custom Dial functions set on transports ([#65547](https://github.com/kubernetes/kubernetes/pull/65547), [@liggitt](https://github.com/liggitt))