* The index associated with the response.
     */
    protected final String index;

    /**
     * The time taken to generate the response in milliseconds.
     */
    protected final long tookMs;

    /**
     * The list of popular words.
     */
    protected final List<String> words;

    /**
     * The number of popular words.
     */
    protected final int num;

    /**

    /** User agent string */
    protected String userAgent = "Crawler";

    /** HTTP client context for requests */
    protected HttpClientContext httpClientContext = HttpClientContext.create();

    /** Proxy host name */
    protected String proxyHost;

    /** Proxy port number */
    protected Integer proxyPort;

    /** Proxy authentication scheme */
    protected AuthScheme proxyAuthScheme = new BasicScheme();

    @Override
    protected String getNamePrefix() {
        return NAME_PREFIX;
    }

    @Override
    protected String getApiPath() {
        return API_PATH;
    }

    @Override
    protected String getKeyProperty() {
        return KEY_PROPERTY;
    }

    @Override
    protected String getListEndpointSuffix() {
        return LIST_ENDPOINT_SUFFIX;
    }

        return facadeSelectByPK(id);
    }

    protected OptionalEntity<CrawlingInfoParam> facadeSelectByPK(String id) {
        return doSelectOptionalByPK(id, typeOfSelectedEntity());
    }

    protected <ENTITY extends CrawlingInfoParam> ENTITY doSelectByPK(String id, Class<? extends ENTITY> tp) {
        return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected CrawlingInfoParamCB xprepareCBAsPK(String id) {

        return facadeSelectByPK(id);
    }

    protected OptionalEntity<UserInfo> facadeSelectByPK(String id) {
        return doSelectOptionalByPK(id, typeOfSelectedEntity());
    }

    protected <ENTITY extends UserInfo> ENTITY doSelectByPK(String id, Class<? extends ENTITY> tp) {
        return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected UserInfoCB xprepareCBAsPK(String id) {

    suite.addTest(testsForVector());
    return suite;
  }

  protected Collection<Method> suppressForEmptyList() {
    return emptySet();
  }

  protected Collection<Method> suppressForSingletonList() {
    return emptySet();
  }

  protected Collection<Method> suppressForArraysAsList() {
    return emptySet();
  }

  protected Collection<Method> suppressForArrayList() {
    return emptySet();
  }

     */
    protected static final String ACCESS_CONTROL_ALLOW_ORIGIN = "Access-Control-Allow-Origin";

    /**
     * CORS header for specifying allowed headers.
     */
    protected static final String ACCESS_CONTROL_ALLOW_HEADERS = "Access-Control-Allow-Headers";

    /**
     * CORS header for specifying allowed HTTP methods.
     */

    @Override
    protected String getNamePrefix() {
        return NAME_PREFIX;
    }

    @Override
    protected String getApiPath() {
        return API_PATH;
    }

    @Override
    protected String getKeyProperty() {
        return KEY_PROPERTY;
    }

    @Override
    protected String getListEndpointSuffix() {
        return LIST_ENDPOINT_SUFFIX;
    }

        return facadeSelectByPK(id);
    }

    protected OptionalEntity<FileAuthentication> facadeSelectByPK(String id) {
        return doSelectOptionalByPK(id, typeOfSelectedEntity());
    }

    protected <ENTITY extends FileAuthentication> ENTITY doSelectByPK(String id, Class<? extends ENTITY> tp) {
        return doSelectEntity(xprepareCBAsPK(id), tp);
    }

    protected FileAuthenticationCB xprepareCBAsPK(String id) {

        @Override
        protected long makeKey(Request request) throws IOException {
            return nextKey++;
        }

        @Override
        protected Long peekKey() throws IOException {
            if (recvException != null) {
                throw recvException;
            }
            return peekedKey;
        }

        @Override
        protected void doSend(Request request) throws IOException {