This reminds me. Most people don't know it, but PostScript is actually a full-fledged programming language, and a PostScript document is actually a program that causes the printer to print the desired document.

Just to demonstrate this, a PostScript printer is a computer with an operating system written in PostScript. If you send it the right document, you can actually reprogram the printer. This will only work if you know how to program in PostScript (there are books) and if you know the correct password (there are well-known defaults).

So you could write your own http server if you wanted!

BTW have you secured your PostScript printer lately?