// No matching host header
        String key = virtualHostHelper.getVirtualHostKey();
        assertEquals("", key);

        // Matching host header
        request.addHeader("Host", "example.com");
        key = virtualHostHelper.getVirtualHostKey();
        assertEquals("", key); // Still empty due to caching

        // Test caching by calling again - should return cached value

        relatedQueryHelper.load();

        // Mock virtual host helper to return site1.com
        virtualHostHelper = new VirtualHostHelper() {
            @Override
            public String getVirtualHostKey() {
                return "site1.com";
            }
        };
        ComponentUtil.register(virtualHostHelper, "virtualHostHelper");

     * @return an array of related query strings, or empty array if none found
     */
    public String[] getRelatedQueries(final String query) {
        final String key = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        final Map<String, String[]> map = relatedQueryMap.get(key);
        if (map != null) {
            final String[] queries = map.get(toLowerCase(query));
            if (queries != null) {

        if (StringUtil.isBlank(requestPath)) {
            return null;
        }
        final String virtualHostKey = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        if (StringUtil.isBlank(virtualHostKey)) {
            return null;
        }
        final String prefix = "/" + virtualHostKey;
        if (requestPath.startsWith(prefix)) {

     * The key is determined by matching HTTP headers against configured virtual hosts.
     *
     * @return The virtual host key, or empty string if no match found
     */
    public String getVirtualHostKey() {
        return LaRequestUtil.getOptionalRequest().map(req -> (String) req.getAttribute(FessConfig.VIRTUAL_HOST_VALUE)).orElseGet(() -> {
            final String value = processVirtualHost(s -> s, StringUtil.EMPTY);

     */
    public void buildQuery(final List<String> keywordList, final List<FilterFunctionBuilder> list) {
        final String key = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        keywordList.stream().forEach(keyword -> {
            final List<Tuple3<String, QueryBuilder, ScoreFunctionBuilder<?>>> boostList = getQueryMap(key).get(toLowerCase(keyword));
            if (boostList != null) {

     * @return array of related content strings, or empty array if no matches found
     */
    public String[] getRelatedContents(final String query) {
        final String key = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        final Pair<Map<String, String>, List<Pair<Pattern, String>>> pair = relatedContentMap.get(key);
        if (pair != null) {
            final List<String> contentList = new ArrayList<>();

        if (labelTypeItemList == null) {
            init();
        }

        final String virtualHostKey = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        final List<LabelTypeItem> labelList;
        if (StringUtil.isBlank(virtualHostKey)) {
            labelList =

            return labelTypeList;
        }
    }

    private static class MockVirtualHostHelper extends VirtualHostHelper {
        @Override
        public String getVirtualHostKey() {
            return ""; // Return empty string for testing
        }
    }

    private static class MockRoleQueryHelper extends RoleQueryHelper {
        @Override

        }

        final String seed = request.getParameter("seed");
        String[] tags = SearchRequestParams.getParamValueArray(request, "label");
        final String key = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        if (StringUtil.isNotBlank(key)) {
            tags = ArrayUtils.addAll(tags, key);
        }
        final String[] fields = request.getParameterValues("field");