The IETF is recommending adding a header that will tell devices if the page used AI to generate or edit its contents.

Google seems to know handle or obey the RateLimit Header Fields for HTTP. Mike Blazer asked John Mueller from Google about this and John said he never heard of it, so he assumes Google Search does ...

The Cache-Control HTTP header field holds directives, in both requests and responses, that control caching in browsers and shared caches (e.g. Proxies, CDNs).