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

    /**

                                    <label for="virtualHostValue" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.virtual_host_value"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="virtualHostValue"/>
                                        <la:textarea styleId="virtualHostValue" property="virtualHostValue"

labels.user_favorite_enabled=Favorite Log
labels.web_api_json_enabled=JSON Response
labels.app_value=System Property
labels.default_label_value=Default Label Value
labels.default_sort_value=Default Sort Value
labels.virtual_host_value=Virtual Host
labels.append_query_param_enabled=Append Search Parameters
labels.login_required=Login Required
labels.result_collapsed=Collapse Duplicate Results
labels.login_link=Show Login Link

labels.user_favorite_enabled=Favorite Log
labels.web_api_json_enabled=JSON Response
labels.app_value=System Property
labels.default_label_value=Default Label Value
labels.default_sort_value=Default Sort Value
labels.virtual_host_value=Virtual Host
labels.append_query_param_enabled=Append Search Parameters
labels.login_required=Login Required
labels.result_collapsed=Collapse Duplicate Results
labels.login_link=Show Login Link

labels.user_info_enabled=使用者日誌
labels.user_favorite_enabled=收藏日誌
labels.web_api_json_enabled=JSON響應
labels.app_value=系統屬性
labels.default_label_value=預設標籤值
labels.default_sort_value=預設排序值
labels.virtual_host_value=虛擬主機
labels.append_query_param_enabled=新增搜尋參數
labels.login_required=需要登入
labels.result_collapsed=折疊重複結果
labels.login_link=顯示登入連結
labels.thumbnail=顯示縮圖
labels.ignore_failure_type=要忽略的錯誤類型

labels.user_favorite_enabled=Favorietenlogboek
labels.web_api_json_enabled=JSON-antwoord
labels.app_value=Systeemeigenschap
labels.default_label_value=Standaardlabelwaarde
labels.default_sort_value=Standaard sorteerwaarde
labels.virtual_host_value=Virtuele host
labels.append_query_param_enabled=Zoekparameter toevoegen
labels.login_required=Inloggen vereist
labels.result_collapsed=Dubbele resultaten samenvouwen
labels.login_link=Inloglink weergeven

    String QUERY_GSA_RESPONSE_FIELDS = "queryGsaResponseFields";

    String THUMBNAIL_HTML_IMAGE_EXCLUDE_EXTENSIONS = "ThumbnailHtmlImageExcludeExtensions";

    String VIRTUAL_HOST_VALUE = "VirtualHostValue";

    String QUERY_DEFAULT_LANGUAGES = "queryDefaultLanguages";

    String HTML_PROXY = "httpProxy";

    String CRAWLER_FAILURE_URL_STATUS_CODES = "crawlerFailureUrlStatusCodes";

labels.web_api_json_enabled=Resposta JSON
labels.app_value=Propriedade do sistema
labels.default_label_value=Valor do rótulo padrão
labels.default_sort_value=Valor de ordenação padrão
labels.virtual_host_value=Host virtual
labels.append_query_param_enabled=Adicionar parâmetro de pesquisa
labels.login_required=Requer login
labels.result_collapsed=Recolher resultados duplicados
labels.login_link=Mostrar link de login

labels.web_api_json_enabled=Ответ JSON
labels.app_value=Свойство системы
labels.default_label_value=Значение метки по умолчанию
labels.default_sort_value=Значение сортировки по умолчанию
labels.virtual_host_value=Виртуальный хост
labels.append_query_param_enabled=Добавить параметры поиска
labels.login_required=Требуется вход
labels.result_collapsed=Свернуть дублирующиеся результаты
labels.login_link=Показать ссылку для входа

labels.web_api_json_enabled=Réponse JSON
labels.app_value=Propriété système
labels.default_label_value=Valeur d'étiquette par défaut
labels.default_sort_value=Valeur de tri par défaut
labels.virtual_host_value=Hôte virtuel
labels.append_query_param_enabled=Ajouter des paramètres de recherche
labels.login_required=Connexion requise
labels.result_collapsed=Réduire les résultats en double