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)) {

        return StringUtil.isBlank(key) ? StringUtil.EMPTY : key;
    }

    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) {

        }, page);
    }

    protected String getVirtualHostBasePath(final String s, final HtmlNext page) {
        return StringUtil.isBlank(s) ? StringUtil.EMPTY : "/" + s;
    }

    public String getVirtualHostKey() {
        return LaRequestUtil.getOptionalRequest().map(req -> (String) req.getAttribute(FessConfig.VIRTUAL_HOST_VALUE)).orElseGet(() -> {
            final String value = processVirtualHost(s -> s, StringUtil.EMPTY);

        return StringUtil.isBlank(key) ? StringUtil.EMPTY : key;
    }

    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<>();

        return Collections.emptyMap();
    }

    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) {

        if (fessConfig.isWebApiPopularWord()) {
            final List<String> tagList = new ArrayList<>();
            final String key = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
            if (StringUtil.isNotBlank(key)) {
                tagList.add(key);
            }
            runtime.registerData("popularWords", popularWordHelper.getWordList(SearchRequestType.SEARCH, null,

        switch (searchRequestType) {
        case ADMIN_SEARCH:
            // nothing to do
            break;
        default:
            final String key = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
            if (StringUtil.isNotBlank(key)) {
                queryContext.addQuery(boolQuery -> {

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

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

        }

        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");

                    searchLog.addRequestHeaderValue(key, v);
                });
            }
        });

        final String virtualHostKey = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        if (StringUtil.isNotBlank(virtualHostKey)) {
            searchLog.setVirtualHost(virtualHostKey);
        } else {
            searchLog.setVirtualHost(StringUtil.EMPTY);
        }