code: def internal_only(view_func):
      
  
      @functools.wraps(view_func)
      def wrapper(request, *args, **kwargs):
          forwards = request.META.get("HTTP_X_FORWARDED_FOR", "").split(",")
          # The nginx in the docker container adds the loadbalancer IP to the list inside
          # X-Forwarded-For, so if the list contains more than a single item, we know
          # that it went through our loadbalancer
          if len(forwards) > 1:
              raise PermissionDenied()
          return view_func(request, *args, **kwargs)
  
      return wrapper
docs: A view decorator which blocks access for requests coming through the load balancer.