### Google Search Appliance (GSA) / Google Mini

Fess provides a [Google Search Appliance](https://enterprise.google.com/search/products/gsa.html) (GSA) compatible API. To enable this API, set `web.api.gsa=true` to system.properties. This will enable an enpoint at `<Fess Server Name>:8080/gsa`. When a search query is sent to `<Fess Server Name>:8080/gsa/?q=QUERY`, a GSA compatible response will be returned

        LabelType[] labelTypes = parser.getLabelTypes();
        assertEquals(3, labelTypes.length);
    }

    public void test_escape() {
        // https://www.google.com/support/enterprise/static/gsa/docs/admin/70/gsa_doc_set/admin_crawl/url_patterns.html#1076127
        assertEscapePattern("", "# Test");
        assertEscapePattern(".*\\Q!/\\E.*", "!/");
        assertEscapePattern("\\Qindex.html\\E", "index.html");

    public static final String WEB_API_JSON_PROPERTY = "web.api.json";

    public static final String WEB_API_SUGGEST_PROPERTY = "web.api.suggest";

    public static final String WEB_API_GSA_PROPERTY = "web.api.gsa";

    public static final String WEB_API_POPULAR_WORD_PROPERTY = "web.api.popularword";

    public static final String APP_VALUE_PROPERTY = "system.properties";

query.additional.facet.fields=
query.additional.sort.fields=
query.additional.analyzed.fields=
query.additional.not.analyzed.fields=
query.gsa.response.fields=UE,U,T,RK,S,LANG
query.gsa.default.lang=en
query.gsa.default.sort=
query.gsa.meta.prefix=MT_
query.gsa.index.field.charset=charset
query.gsa.index.field.content_type.=content_type
query.collapse.max.concurrent.group.results=4
query.collapse.inner.hits.name=similar_docs

    String API_JSON_RESPONSE_HEADER_LIST = "apiJsonResponseHeaderList";

    String API_GSA_RESPONSE_HEADER_LIST = "apiGsaResponseHeaderList";

    String SMB_AVAILABLE_SID_TYPES = "smbAvailableSidTypes";

    String LOGGING_SEARCH_DOCS_FIELDS = "loggingSearchDocsFields";

    String API_SEARCH_ACCEPT_REFERERS = "apiSearchAcceptReferers";

    String QUERY_GSA_RESPONSE_FIELDS = "queryGsaResponseFields";

    String QUERY_GSA_RESPONSE_FIELDS = "query.gsa.response.fields";

    /** The key of the configuration. e.g. en */
    String QUERY_GSA_DEFAULT_LANG = "query.gsa.default.lang";

    /** The key of the configuration. e.g.  */
    String QUERY_GSA_DEFAULT_SORT = "query.gsa.default.sort";

    /** The key of the configuration. e.g. MT_ */
    String QUERY_GSA_META_PREFIX = "query.gsa.meta.prefix";

    }

    protected GeoInfo createGeoInfo(final HttpServletRequest request) {
        return new GeoInfo(request);
    }

    public enum SearchRequestType {
        SEARCH, ADMIN_SEARCH, JSON, GSA, SUGGEST;
    }

    public String[] getResponseFields() {
        return ComponentUtil.getQueryFieldConfig().getResponseFields();
    }

            if (Constants.SEARCH_LOG_ACCESS_TYPE_JSON.equals(accessType)) {
                return processJsonSearchPreference(r, query);
            }
            if (Constants.SEARCH_LOG_ACCESS_TYPE_GSA.equals(accessType)) {
                return processGsaSearchPreference(r, query);
            }
            return null;
        }).ifPresent(p -> searchRequestBuilder.setPreference(p)));
    }

                searchLog.setAccessType(Constants.SEARCH_LOG_ACCESS_TYPE_JSON);
            } else if (Constants.SEARCH_LOG_ACCESS_TYPE_GSA.equals(accessType)) {
                searchLog.setAccessType(Constants.SEARCH_LOG_ACCESS_TYPE_GSA);
            } else if (Constants.SEARCH_LOG_ACCESS_TYPE_OTHER.equals(accessType)) {
                searchLog.setAccessType(Constants.SEARCH_LOG_ACCESS_TYPE_OTHER);

    protected WebConfig webConfig = null;

    protected FileConfig fileConfig = null;

    protected StringBuilder textBuf = new StringBuilder(1000);

    protected String userAgent = "gsa-crawler";

    public void parse(final InputSource is) {
        try {
            final SAXParserFactory factory = SAXParserFactory.newInstance();