One line HTTP Proxy command?

Is there a simple, one-line command to run a HTTP Proxy? There are several one-line commands “serve this directory over HTTP” (e.g. python -m SimpleHTTPServer). Is there any command, or one-liner, for launching a HTTP Proxy like that? I don't need to configure anything, this is just for short term, temporary use. It doesn't have to be efficient, or multithreaded, or performant. I want something FLOSS, and preferably just an apt-get install away on my Ubuntu Linux 18.04 desktop.