###本項はLumen Edge Application DeliveryでのVarnishについての記述です
https://lumen-28.hubspotpagebuilder.com/lumen-technologies-japan/lumen-edge-cloud-app-delivery

#HTTP→HTTPSへの固定(HTTPS Only）

この場合は以下のリライトを設定します

VCLv4

sub vcl_recv {
  if (req.http.X-Forwarded-Proto !~ "https") {
    return (synth(850, "Moved Permanently"));
  }
}

sub vcl_synth {
  if(resp.status == 850) {
    set resp.http.Location = "https://" + req.http.host + req.url;
    set resp.status = 301;
    return(deliver);
  }
}

sub vcl_hash {
  hash_data(req.http.X-Forwarded-Proto);
}