/**
     * Get the Retry-After header value in seconds.
     * @return the retry after seconds
     */
    public int getRetryAfterSeconds() {
        return ComponentUtil.getFessConfig().getRateLimitRetryAfterSecondsAsInteger();
    }

    /**
     * Block an IP address for the specified duration.
     * Note: The duration is ignored as the cache uses the configured block duration.
     * @param ip the IP address to block