pkg io, const SeekStart = 0
pkg io, const SeekStart ideal-int
pkg math/big, method (*Float) GobDecode([]uint8) error
pkg math/big, method (*Float) GobEncode() ([]uint8, error)
pkg net, method (*Dialer) DialContext(context.Context, string, string) (Conn, error)
pkg net/http, const StatusAlreadyReported = 208
pkg net/http, const StatusAlreadyReported ideal-int
pkg net/http, const StatusFailedDependency = 424

pkg crypto/rsa, method (*PublicKey) Equal(crypto.PublicKey) bool
pkg crypto/tls, method (*Dialer) Dial(string, string) (net.Conn, error)
pkg crypto/tls, method (*Dialer) DialContext(context.Context, string, string) (net.Conn, error)
pkg crypto/tls, method (ClientAuthType) String() string
pkg crypto/tls, method (CurveID) String() string
pkg crypto/tls, method (SignatureScheme) String() string

}

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{

	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
}