}
        return hosts;
    }

    String getCrawlerFailureUrlStatusCodes();

    default boolean isCrawlerFailureUrlStatusCodes(final int code) {
        int[] codes = (int[]) propMap.get(CRAWLER_FAILURE_URL_STATUS_CODES);
        if (codes == null) {
            codes = split(getCrawlerFailureUrlStatusCodes(), ",")

     * comment: HTTP status codes considered as failure URLs.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCrawlerFailureUrlStatusCodes();

    /**
     * Get the value for the key 'crawler.failure.url.status.codes' as {@link Integer}. <br>
     * The value is, e.g. 404 <br>
     * comment: HTTP status codes considered as failure URLs.