request.send(new BufferingResponseListener() {
            @Override
            public void onComplete(Result result) {
                try { 
                    //this is always empty when use agent
                    byte[] responseBytes = getContent();
                    if (responseBytes == null || responseBytes.length == 0) {
                        System.out.println("responseBytes is empty");
                    }
                    System.out.println(new String(responseBytes, "UTF-8"));
                } catch (UnsupportedEncodingException e) {
                    throw new RuntimeException(e);
                }
            }
        });