if (req.restarts == 0) {
  set req.backend = F_origin_0;
  set req.http.tmpOrigUrl = req.url;
  set req.url = "/response-headers?Flags=group-A,new-header,search-enabled";
} else {
  set req.backend = F_origin_1;
  
  # After a restart, clustering is disabled.  This re-enables it.
  set req.http.Fastly-Force-Shield = "1";
}

return(lookup);