How to retrieve response code of a page loaded in a Tab?

[dkvasnicka]

I know I can register a handler via register_response_handling and I've successfully got to the response code and printed it. Applying logic isolated inside an async callback like Box<dyn Fn(ResponseReceivedEventParams, ... is simple but trying to get the value out to be able to do something with it inside main seems like a massive PITA... maybe I'm missing something.

What's the simplest way to retrieve the response code of the top-level URL request after a Tab finishes navigating?