protected ResourceUtil() {
        // nothing
    }

    public static String getFesenHttpUrl() {
        final String url = SystemUtil.getSearchEngineHttpAddress();
        if (url != null) {
            return url;
        }
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return fessConfig.getFesenHttpUrl();
    }

    public static String getAppType() {