code: def raise_204(instance):
      
      instance.response.status = 204
      instance.response.body = ''
      instance.response.body_raw = None
      raise ResponseException(instance.response)
docs: Abort the current request with a 204 (No Content) response code. Clears
      out the body of the response.
  
      :param instance: Resource instance (used to access the response)
      :type instance: :class:`webob.resource.Resource`
      :raises: :class:`webob.exceptions.ResponseException` of status 204