// 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))