Every once in a while I have the need to inspect traffic from an app on my iPhone. I used to use the Postman Mac app and the built-in proxy feature, but recently they updated it to require registration and sign-in.

Instead of trying to find another tool, I wrote my own Go program: mitm-proxy. It runs as an HTTP/HTTPS man-in-the-middle proxy, generates TLS certs on the fly, and logs all requests/responses into a local SQLite database.