def _bind(self, _descriptor):
<EOL>self._defcode = getattr(_descriptor.method, '<STR_LIT>', <NUM_LIT:200>)<EOL>self.content_type, self.serializer = _descriptor.serializer(self.req)<EOL>
Bind a ResponseObject to a given action descriptor.  This
updates the default HTTP response code and selects the
appropriate content type and serializer for the response.