docs: def initiate(self):
          """
          Initiate the resource retrieving all the asynchronous
          information needed to support the IWebResource interface.
          """
  
          def deduce_methods(actions):
              self._methods.add(http.Methods.GET)
              for action in actions:
                  method = self.action_methods.get(action.name)
                  if method is not None:
                      self._methods.add(method)
  
          d = self.model.fetch_actions()
          d.addCallback(deduce_methods)
          d.addCallback(defer.override_result, self)
          d.addErrback(self.filter_errors)
          return d