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It's very old and has lots of quick and dirty bits to it that I added to try various things.
I have used it and still use it for testing and debugging applets and client code.

The source is in a zip file.

I'd change that to:
browser requests the server to read a html document from a directory

Has CGI be replaced by JSP, etc?

If you want to look at some very old code that I wrote to learn about...