return sha256Sum, releaseTime, releaseInfo, err
}

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,

pkg net/http, func ParseHTTPVersion(string) (int, int, bool)
pkg net/http, func Post(string, string, io.Reader) (*Response, error)
pkg net/http, func PostForm(string, url.Values) (*Response, error)
pkg net/http, func ProxyFromEnvironment(*Request) (*url.URL, error)
pkg net/http, func ProxyURL(*url.URL) func(*Request) (*url.URL, error)
pkg net/http, func ReadRequest(*bufio.Reader) (*Request, error)