public static final String TIME_TO_LIVE_TIME_UNIT_PROPERTY = "timeToLiveTimeUnit";

    /** Property name for time to live setting */
    public static final String TIME_TO_LIVE_PROPERTY = "timeToLive";

    /** Logger instance for this class */
    private static final Logger logger = LogManager.getLogger(HcHttpClient.class);

    /** Helper for processing robots.txt files */
    @Resource