It would be neat, but it's impossible, because Gemini explicitly forbids any request types other than GET, or rather a practical clone of GET that isn't called

It would be neat, but it's impossible, because Gemini explicitly forbids any request types other than GET, or rather a practical clone of GET that isn't called that because there isn't anything else anyways. Without a POST or other support for sending larger bodies, there's a ton of interesting stuff you just can't ever do. If they know they don't ever want that to be possible, well fair enough it's their protocol, but I don't see the point of a cool feature like identifying clients explicitly by client TLS certs only when clients can never do anything but view documents and maybe do a simple search anyways.