code: public void handleHttpSession(Response serverResponse, String headerKey) {
          /** ---------------
           * Session handled
           * ----------------
           */
          if ("Set-Cookie".equals(headerKey)) {
              COOKIE_JSESSIONID_VALUE = serverResponse.getMetadata().get(headerKey);
          }
      }
docs: This method handles the http session to be maintained between the calls.
  In case the session is not needed or to be handled differently, then this
  method can be overridden to do nothing or to roll your own feature.
  
  @param serverResponse
  @param headerKey