[plt-scheme] getting raw port of HTTP POST data in PLT Web Server in PLT 4.2.5?

In 4.2.5, from a servlet, will I be able to get a raw port of the HTTP 
POST data, such that I can do my own MIME multipart decoding and 
streaming to disk?

I would really-really like to have this.

(I think I saw something on the email list recently that hinted I might 
be able to do this, but I can't find it at the moment.)

Thanks.

-- 
http://www.neilvandyke.org/