code: public byte[] responseAsBytes() throws IOException {
          InputStream is = responseAsInputStream();
          try {
              return IOUtils.toByteArray(is);
          } finally {
              Utils.close(is);
              disconnect();
          }
  
      }
docs: <p>
  Return response body data from server as a byte array.
  </p>
  <p>
  <b>Important:</b> you must call <code>execute()</code> before calling this method.
  </p>
  
  @return Byte array of response body data from server, if any
  @throws IOException if there was a problem reading data from the server