code: def initial(self, request, *args, **kwargs):
          
          self.format_kwarg = self.get_format_suffix(**kwargs)
  
          # Ensure that the incoming request is permitted
          self.perform_authentication(request)
          self.check_permissions(request)
          self.check_throttles(request)
  
          # Perform content negotiation and store the accepted info on the request
          neg = self.perform_content_negotiation(request)
          request.accepted_renderer, request.accepted_media_type = neg
  
          # Determine the API version, if versioning is in use.
          version, scheme = self.determine_version(request, *args, **kwargs)
          request.version, request.versioning_scheme = version, scheme
docs: Runs anything that needs to occur prior to calling the method handler.