Proposal about content-size and hash

[Emery Hemingway]

I'd also like to see optional content hashes to aid caching and archiving.

What I miss about the pre-HTTPs days was that personalizing the web
experience was something that could be done independently of the browser
via proxies, be it caching, ad-blocking, or text manipulation.

I'd like to see proxies make a comeback, and local caching proxies seem
like good place a good start.

E.