public interface FessTransformer {

    Map<String, String> parentEncodingMap = Collections.synchronizedMap(new LruHashMap<>(1000));

    FessConfig getFessConfig();

    Logger getLogger();

    default String getHost(final String u) {
        if (StringUtil.isBlank(u)) {
            return StringUtil.EMPTY; // empty
        }

        String url = u;
        final String originalUrl = url;