if (format == null || format.trim().isEmpty()) {
            throw new IllegalArgumentException("Export format must not be null or empty");
        }
        switch (format.trim().toLowerCase()) {
        case "html":
            return new HtmlIndexExportFormatter();
        case "json":
            return new JsonIndexExportFormatter();
        default:

                    }
                }
            }

            for (final String s : context.fessConfig.getSearchlogRequestHeadersAsArray()) {
                final String key = s.replace('-', '_').toLowerCase(Locale.ENGLISH);
                Collections.list(context.request.getHeaders(s)).stream().forEach(v -> {
                    searchLog.addRequestHeaderValue(key, v);
                });
            }
        }

        if (StringUtil.isBlank(value)) {
            return null;
        }

        final String localeName = value.trim().toLowerCase(Locale.ENGLISH).replace("-", "_");

        for (final String supportedLang : supportedLanguages) {
            if (localeName.startsWith(supportedLang.toLowerCase(Locale.ENGLISH))) {
                return supportedLang;
            }
        }
        return null;
    }

    /**

            if (StringUtil.isNotBlank(language)) {
                if (StringUtil.isNotBlank(country)) {
                    return language.toLowerCase(Locale.ROOT) + "-" + country.toLowerCase(Locale.ROOT);
                }
                return language.toLowerCase(Locale.ROOT);
            }
            return null;
        }).toArray(n -> new String[n]));
    }

     */
    protected void processPluginRequest(final HttpServletRequest request, final HttpServletResponse response, final String path) {
        if (StringUtil.isNotBlank(path)) {
            final String lowerPath = path.toLowerCase(Locale.ROOT);
            if (lowerPath.endsWith(".html")) {
                response.setContentType("text/html;charset=utf-8");
            } else if (lowerPath.endsWith(".css")) {

        final String value = values.length > 3 ? values[3] : null;
        if (value == null) {
            return FormatType.SEARCH;
        }
        final String type = value.toLowerCase(Locale.ROOT);
        if ("documents".equals(type)) {
            if (values.length > 5 && "favorite".equals(values[5])) {
                request.setAttribute(DOC_ID_FIELD, values[4]);