[plt-scheme] web server

This might seem like a strange request, but can anyone direct me to what I need to implement a web server in scheme.  What I am looking for are information on what a web server is and how it works.  I would like to roll my own web server, mostly for my own education, but also so I can customize it as needed for different projects.

I am going to spend some time with the one in the library's code, but a detailed overview of what one does and what one needs to do in order to do its job would be great.

Tia, for any help.

rohan