return LaRequestUtil.getOptionalRequest().map(req -> {
            @SuppressWarnings("unchecked")
            final List<String> pagingQueryList = (List<String>) req.getAttribute(Constants.PAGING_QUERY_LIST);
            if (pagingQueryList != null) {
                final String prefix;
                if (query != null) {
                    prefix = "ex_q=" + query.split(":")[0] + "%3A";

    // Request and Search Constants
    // ============================================================

    /** Paging query list parameter name. */
    public static final String PAGING_QUERY_LIST = "pagingQueryList";

    /** Request languages parameter name. */
    public static final String REQUEST_LANGUAGES = "requestLanguages";

    /** Request page size parameter name. */