[plt-scheme] how to write a web sever

Hi everyone,

Now I want to write a program using PLT-Scheme. The program should be a web sever (that is, its only interface is HTML and http). I have read HtDP, SICP, and some of the HELP DESK, but still feel some difficulty in writing the program. 

I know that there is a web-sever program in DrScheme. How can I use it? Or must I use "Documentation for the web-server collection" in HELP DISK and write my onw code? I would be very appreciative if anyone can give some suggestion.