🐛 BUG: Pages does not create correct Vary and ETag Headers

### Which Cloudflare product(s) does this pertain to?

Pages

### What version of `Wrangler` are you using?

2.10.0

### What operating system are you using?

Windows

### Describe the Bug

I was testing my site cxres.pages.dev against redbot https://redbot.org/ (incidentally developed by a cloudflare employee Mark Nottingham) and I am getting one error and one warning:
+ The Vary header is not sent when a user agent content negotiates uncompressed version using Accept-Encoding header.
+ ETag header is not being sent with a 304 response.

Both of these relate to Pages not serving the website correctly.

I also want to point out the hostility I am facing at the community forum (Discord) where my bug reports go repeatedly unanswered and when I tag a human they send me a waning instead (no one spoke to me before shooting the warning off). My previous bug too took many months to resolve because they were not brought to the notice of the appropriate team here. Please fix this behaviour, we are also giving our valuable time when finding and following up and testing bugs for you!