* @param request The request data.
     * @return The response data.
     */
    @Override
    public ResponseData execute(final RequestData request) {
        if (listener != null) {
            listener.onRequestStart(this, request);
        }

        List<Exception> exceptionList = null;
        try {
            int count = 0;
            while (count < maxRetryCount) {
                if (listener != null) {