When a handler is found for a registered URI then this class is constructed and passed to your HttpHandler::process method. You should assume that one handler processes all requests. Included in the HttpReqeust is a HttpRequest.params Hash that matches common CGI params, and a HttpRequest.body which is a string containing the request body (raw for now).

Mongrel really only supports small-ish request bodies right now since really huge ones have to be completely read off the wire and put into a string. Later there will be several options for efficiently handling large file uploads.