httpClientBuilder.setUserAgent(userAgent);
        }

        final HttpRoutePlanner planner = buildRoutePlanner();
        if (planner != null) {
            httpClientBuilder.setRoutePlanner(planner);
        }

        // AuthSchemeFactory - build registry with defaults + NTLM if needed
        final RegistryBuilder<AuthSchemeFactory> authSchemeRegistryBuilder = RegistryBuilder.create();