countryblock_error.html.twig in Fastly 8.3

if (obj.status == 921 && obj.response == "[modly:countryblock]") {
  set obj.status = 403;
  set obj.response = "Forbidden";
  if (req.http.Fastly-Debug) {
    set obj.http.Fastly-Country-Block = client.geo.country_code;
  }
  synthetic "";
  return (deliver);
}