code: func (hc *HTTPChecker) String() string {
  	attr := []string{fmt.Sprintf("code %d", hc.ResponseCode)}
  	if hc.Proxy {
  		attr = append(attr, "proxy")
  	}
  	if hc.Secure {
  		attr = append(attr, "secure")
  		if hc.TLSVerify {
  			attr = append(attr, "verify")
  		}
  	}
  	s := strings.Join(attr, "; ")
  	return fmt.Sprintf("HTTP %s %s [%s] %s", hc.Method, hc.Request, s, hc.Target)
  }
docs: // String returns the string representation of an HTTP healthcheck.