}
        return gsaResponseFieldSet.contains(name.toLowerCase(Locale.ROOT));
    }

    String getApiSearchAcceptReferers();

    default boolean isAcceptedSearchReferer(final String referer) {
        Pattern[] patterns = (Pattern[]) propMap.get(API_SEARCH_ACCEPT_REFERERS);
        if (patterns == null) {
            final String refs = getApiSearchAcceptReferers();

            return;
        }
        final SearchHelper searchHelper = ComponentUtil.getSearchHelper();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        if (!fessConfig.isAcceptedSearchReferer(request.getHeader("referer"))) {
            writeJsonResponse(HttpServletResponse.SC_BAD_REQUEST, escapeJsonKeyValue(MESSAGE_FIELD, "Referer is invalid."));
            return;
        }