}

func getUpdateTransport(timeout time.Duration) http.RoundTripper {
	var updateTransport http.RoundTripper = &http.Transport{
		Proxy:                 http.ProxyFromEnvironment,
		DialContext:           xhttp.NewInternodeDialContext(timeout, globalTCPOptions),
		IdleConnTimeout:       timeout,
		TLSHandshakeTimeout:   timeout,
		ExpectContinueTimeout: timeout,
		TLSClientConfig: &tls.Config{

)

// ContextDialer is a dialer that can be used to dial a remote.
type ContextDialer func(ctx context.Context, network, address string) (net.Conn, error)

// DialContext implements the Dialer interface.
func (c ContextDialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
	return c(ctx, network, address)
}

const (

	var d net.Dialer
	var retry int
	for retry < len(hosts) {
		ctx, cancel := context.WithTimeout(GlobalContext, 300*time.Millisecond)

		host = hosts[rng.Intn(len(hosts))]
		conn, err := d.DialContext(ctx, "tcp", host)
		cancel()
		if err != nil {
			retry++
			continue
		}
		conn.Close()
		break
	}

	return host
}