I usually write web apps in PHP, Ruby or Perl. I am starting the study of Scheme and I want to try some web project with this language. But I can't find what is the best environment for this.

I am looking for the following features:

• A simple way of get the request parameters (something like: get-get #key, get-post #key, get-cookie #key).
• Mysql access.
• HTML Form generators, processing, validators, etc.
• Helpers for filter user input data (something like htmlentities, escape variables for put in queries, etc).
• FLOSS.
• And GNU/Linux friendly.

So, thanks in advance to all replies.