Varnish Via and X-Varnish headers: are they needed in production?

Question

We have just deployed several varnish instances in production and I'm wondering whether is it ok to unset the Via: and X-Varnish: headers.

As far as I read Via is only an info header, while X-Varnish is for debugging, but I didn't find info about whether they're optional or necessary.

So is it safe to removed them like this?

sub vcl_deliver {
  unset resp.http.Via;
  unset resp.http.X-Varnish;
}

Answer 1

从清漆/浏览器/最终用户的角度来看，它们都是可选的，可以删除。