I'm hoping the answer will be:

* Use Cap'n Proto in your Rust backend. This is what you want in a type-safe language like Rust: generated code based on a well-defined schema.

* We'll build some sort of proxy that, given a Cap'n Proto schema, converts between Cap'n Web and Cap'n Proto. So your frontend can speak Cap'n Web.

But this proxy is just an idea for now. No idea if or when it'll exist.

Do you feel like we are reaching the final form for RPC protocols yet?