if (ageMillis + minFreshMillis >= freshMillis) {
          builder.addHeader("Warning", "110 HttpURLConnection \"Response is stale\"")
        }
        val oneDayMillis = 24 * 60 * 60 * 1000L
        if (ageMillis > oneDayMillis && isFreshnessLifetimeHeuristic()) {
          builder.addHeader("Warning", "113 HttpURLConnection \"Heuristic expiration\"")
        }

            scheme.authenticate(credentials, (request, consumer) -> {

                // request header
                for (final Header header : requestHeaderList) {
                    request.addHeader(header);
                }

                HttpEntity httpEntity = null;
                try {

    }

    public HttpClientResponse performRequest(HttpRequestBase request, boolean revalidate) {
        String method = request.getMethod();
        if (revalidate) {
            request.addHeader(HttpHeaders.CACHE_CONTROL, "max-age=0");
        }
        try {
            return executeGetOrHead(request);
        } catch (FailureFromRedirectLocation e) {