code: protected Response delete(MultivaluedMap<String, String> queryParams, URL url) {
          return (invocation(url, queryParams).delete());
      }
docs: Perform an HTTP DELETE call with the specified form data and URL, returning
  a Response instance with the data returned from the endpoint.
  
  @param queryParams multivalue map of request parameters
  @param url the fully formed path to the GitLab API endpoint
  @return a Response instance with the data returned from the endpoint