[plt-scheme] Servlet Locations

Hi, I am going to write a personal home page, and I thought it would
be fun to give the PLT Scheme web server a try. I've looked at the
documentation at http://docs.plt-scheme.org/web-server/ , and I've got
a question. I'm a little noobish in terms of web server knowledge, so
forgive me if there is something simple I am overlooking.

As far as I can tell, all servlets must be located in the /servlets
directory. So for example, my site could be at
http://localhost/servlets/site.ss/some/path/, where /some/path/ is
info to tell it what page to display. What I would want, though, is to
be able to use something like http://localhost/site/some/path/, or
maybe even http://localhost/some/path/ (if I can get at the utility
servlets some other way).

The documentation mentions some sort of "servlet filter," but never
actually says what it is or how it is configured.

How can I accomplish this?

Have a nice day,
    Henk Boom