Is there any built-in tool (e.g., found on a vanilla
ubuntu Docker container, or found in a minimal Ubuntu Server install) that can download a file over HTTP? In other words, without having to execute
apt update && apt install [curl|wget].
perl might be able to with
File::Fetch but it isn't built-in. (You could create a TCP connection manually, but that's getting involved.)
ADD. Otherwise, Python might be an option for Ubuntu server.
ADDis a good point, I didn't know it could fetch files.