code: public EngineResult postEngineRequest(String url, String action) {
          HttpPost postRequest = new HttpPost(url);
          StringEntity postEntity = null;
          try {
              postEntity = new StringEntity(action);
          } catch (UnsupportedEncodingException e) {
              e.printStackTrace();
          }
          postEntity.setContentType("application/x-www-form-urlencoded");
          postRequest.addHeader("Accept", "application/xml");
          postRequest.setEntity(postEntity);
          return engineResult(postRequest);
      }
docs: TODO
  @param url
  @param action
  @return