Intercept HTTP/HTTPS requests from a Linux executable running in the terminal

I have to solve a simple reverse engineering challenge. The goal is to understand some endpoints and parameters of a Rest API.

I'm executing a simple program in a Ubuntu terminal. The program makes the user authenticate and I know that this authentication is performed through HTTP or HTTPs using an API.

​

How can I intercept the HTTP/HTTPS packages and see the content of them?

​

For example, I know how to intercept and analyse the HTTP packages being …

api authenticate authentication challenge cybersecurity endpoints engineering http https intercept linux program requests rest rest api reverse reverse engineering running simple terminal ubuntu understand