// return user-agent which may be truncated.
type lazyTruncatedUserAgent struct {
	req *http.Request
}

func (lazy *lazyTruncatedUserAgent) String() string {
	ua := "unknown"
	if lazy.req != nil {
		ua = utilnet.GetHTTPClient(lazy.req)
		if len(ua) > maxUserAgentLength {
			ua = ua[:maxUserAgentLength] + userAgentTruncateSuffix
		}
	}
	return ua
}

// LazyClientIP implements String() string and it will

		return nil, errorList
	}
	if config, err = evc.configCertAndKey(config); err != nil {
		errorList = append(errorList, err)
		return nil, errorList
	}

	client := evc.getHTTPClient(config)
	for _, endpoint := range evc.Etcd.External.Endpoints {
		if _, err := url.Parse(endpoint); err != nil {
			errorList = append(errorList, errors.Wrapf(err, "failed to parse external etcd endpoint %s", endpoint))

func FormatURL(scheme string, host string, port int, path string) *url.URL {
	return &url.URL{
		Scheme: scheme,
		Host:   net.JoinHostPort(host, strconv.Itoa(port)),
		Path:   path,
	}
}

func GetHTTPClient(req *http.Request) string {
	if ua := req.UserAgent(); len(ua) != 0 {
		return ua
	}
	return "unknown"
}

// SourceIPs splits the comma separated X-Forwarded-For header and joins it with