code: public void run()
      {
          try
          {
              // Open connection to URL calling this interceptor.
              HttpURLConnection connection = (HttpURLConnection) url.openConnection();
              // Pass in the session id cookie to maintain the same session.
              log.trace("passing in cookies: ", cookies);
              connection.setRequestProperty("Cookie", cookies);
              // Invoke event in background.
              byte[] buff = new byte[1024 * 4];
              InputStream input = connection.getInputStream();
              try {
                  while (input.read(buff) > -1);
              } finally {
                  input.close();
              }
          }
          catch (Exception e)
          {
              // Log any exception that could have occurred.
              log.error(e);
          }
      }
docs: Invoke event in a background request.