// connect happens.
func newClient(endpoint string) NetLocker {
	u, err := url.Parse(endpoint)
	if err != nil {
		panic(err)
	}

	tr := &http.Transport{
		Proxy:                 http.ProxyFromEnvironment,
		MaxIdleConnsPerHost:   1024,
		WriteBufferSize:       32 << 10, // 32KiB moving up from 4KiB default
		ReadBufferSize:        32 << 10, // 32KiB moving up from 4KiB default
		IdleConnTimeout:       15 * time.Second,

	}

	// For more details about various values used here refer
	// https://golang.org/pkg/net/http/#Transport documentation
	tr := &http.Transport{
		Proxy:                 http.ProxyFromEnvironment,
		DialContext:           dialContext,
		MaxIdleConnsPerHost:   maxIdleConnsPerHost,
		WriteBufferSize:       WriteBufferSize,
		ReadBufferSize:        ReadBufferSize,
		IdleConnTimeout:       15 * time.Second,

	}

	args := &OperatorDNS{
		Endpoint: endpoint,
	}
	for _, setter := range setters {
		setter(args)
	}
	args.httpClient = &http.Client{
		Transport: &http.Transport{
			Proxy: http.ProxyFromEnvironment,
			DialContext: (&net.Dialer{
				Timeout:   3 * time.Second,
				KeepAlive: 5 * time.Second,
			}).DialContext,
			ResponseHeaderTimeout: 3 * time.Second,
			TLSHandshakeTimeout:   3 * time.Second,

	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)