code: def _execute(self, request, **kwargs):
          try:
              self._create_context(request)
              self._authenticate()
              context = get_current_context()
              self._parse_args()
              if hasattr(self, '_before_handlers') and \
                      isinstance(self._before_handlers, (list, tuple)):
                  for handler in self._before_handlers:
                      handler(context)
              context.handler_result = self._handle(context)
              if hasattr(self, '_after_handlers') and \
                      isinstance(self._after_handlers, (list, tuple)):
                  for handler in self._after_handlers:
                      handler(context)
              self._render()
              response = context.response
          except AuthenticationError as e:
              if hasattr(e, 'message') and e.message is not None:
                  message = e.message
              else:
                  message = "You don't have permission to do that."
              err = APIError.Forbidden(message)
              response = self._response_class(*err.response)
              response.headers["Content-Type"] = 'application/json'
          except ArgumentError as e:
              err = APIError.UnprocessableEntity(e.message)
              response = self._response_class(*err.response)
              response.headers["Content-Type"] = 'application/json'
          except APIError as e:
              response = self._response_class(*e.response)
              response.headers["Content-Type"] = 'application/json'
          except PaleRaisedResponse as r:
              response = self._response_class(*r.response)
              response.headers["Content-Type"] = 'application/json'
          except Exception as e:
              logging.exception("Failed to handle Pale Endpoint %s: %r", self.__class__.__name__,
                  e)
              err = APIError.Exception(repr(e))
              response = self._response_class(*err.response)
              response.headers["Content-Type"] = 'application/json'
          allow_cors = getattr(self, "_allow_cors", None)
          if allow_cors is True:
              response.headers['Access-Control-Allow-Origin'] = '*'
          elif isinstance(allow_cors, basestring):
              response.headers['Access-Control-Allow-Origin'] = allow_cors
          context.response = response
          try:
              if hasattr(self, '_after_response_handlers') and \
                      isinstance(self._after_response_handlers, (list, tuple)):
                  for handler in self._after_response_handlers:
                      handler(context, response)
          except Exception as e:
              logging.exception(
                  "Failed to process _after_response_handlers for Endpoint %s",
                  self.__class__.__name__)
              raise
          return response