proxyURL, err := url.Parse(urlString)
	if err != nil {
		return "", fmt.Errorf("invalid proxy server url %q: %v", urlString, err)
	}
	return proxyURL.Host, nil
}

func connectionToDialerCreator(c apiserver.Connection) (*dialerCreator, error) {
	switch c.ProxyProtocol {

	case apiserver.ProtocolHTTPConnect:
		if c.Transport.UDS != nil {
			return &dialerCreator{