An incomplete HTTP(S) man-in-the-middle library akin to Fiddler.
Hence, the goal is to intercept HTTP(S) requests via an HTTP(S) proxy. HTTPS is the hard part, as it requires a man-in-the-middle attack to accomplish. Like Fiddler, this attack is facilitated by creating a local CA Certificate trust. The code relies "github.com/smallstep/truststore" to reg for Java, Firefox, and the local operatings system.
This is a work in progress, and doesn't fully function yet If you're looking for working software, check out goproxy.