getting the response body of HttpResponse

First, see if your server is not returning blank response:

response.getEntity().getContentLength();  //it should not be 0

Second, try the following to convert response into string:

StringBuilder sb = new StringBuilder();
try {
    BufferedReader reader = 
           new BufferedReader(new InputStreamReader(entity.getContent()), 65728);
    String line = null;

    while ((line = reader.readLine()) != null) {
        sb.append(line);
    }
}
catch (IOException e) { e.printStackTrace(); }
catch (Exception e) { e.printStackTrace(); }


System.out.println("finalResult " + sb.toString());