Dumping actual headers from ureq

I'd like to see the actual headers ureq sends and receives from the other end. Not just the headers the user sets, but the ones set internally - charset, etc. Is there some way to do that?

It has some hardcoded logic to append headers, and there are no callbacks or any other interface to get access to them at runtime. ureq/src/unit.rs at main ยท algesten/ureq (github.com)

Ah. It has "debug!()" logging, and I have env-logger, so I can turn that on for "ureq".