What a coincidence. Just earlier this week I was installing yarn in a docker container using their official instructions (https://yarnpkg.com/lang/en/docs/install/#debian-stable) and found out I had to install apt-transport-https for it to work.

Since the image was already apt-get install'ing a bunch of other packages at that point and everything seemed to work, the obvious question that popped in my head was: does this mean none of the other packages I've been downloading used https? That's what led me to this website.