cookie.filter_except は6.4で削除された。cookie.keepを使う
Imported VMOD cookie - Varnish Cookie Module from varnish_modules
The previously deprecated function cookie.filter_except() has been removed during import. It was replaced by cookie.keep()
https://varnish-cache.org/docs/7.0/whats-new/changes-6.4.html
4.0
Starting varnishd. Error: Message from dlopen: Compiled VCL version (4.0) not supported. Running dlopen failed, exited with 1 VCL compilation failed
req.http.host と req.http.Host どちらがよいのか
https://github.com/varnishcache/varnish-cache/blob/master/bin/varnishd/builtin.vcl
https://developer.fastly.com/reference/http/http-headers/Host/
→ req.http.host
