docs: def _generate_url(self, resource, query_params=None):
          """
          Build the url to resource.
  
          :param resource: Name of the resource that is being called. Options are
          `''` (empty string) for root resource, `'parser'`, `'confidence'`.
          :param query_params: Data to be passed as query parameters.
          """
          resource = '{resource}?token={token}'.format(resource=resource, token=self.token)
          if query_params:
              resource += "&{}".format(urlencode(query_params))
          return self.base_url_template.format(resource)