Nice app, really like the clean and responsive GUI and (of course) local-only.
I'm alot for the low-level though, one huge improvement (IMHO) would be the possibility to have the entire request/response flow in the results-tab in plain-text, as opposed to only seeing the response. Maybe it is already possible to show the request (?) but I could not find a setting for it.
Ideally, I would have loved if it was possible to show request(headers+body), followed by response(headers+body), as plain-text similar to how 'curl -v' does it.
Keep up the good work!