That’s correct. Well blocking is not much of an issue in and of itself but it’s blocking and single process and single threaded, so it can only serve one request at a time.

It’s not usually an issue for small stuff, but it does mean you can’t really use this snippet to serve big files for a lan, which is a bit of a surprise the first time you hit that limitation.

Python 2 was blocking. Python 3 is non-blocking.