Get parameters from the Request Body

Straightforward question:

Is it possible to get the query parameters from the current request from parameters in the body (POST) instead of just using the query string? I've got a workflow that can grab the query string, and it works great, but for large objects, like GML for example, a post is the only realistic option. Using the RequestInfo object, I can access the headers, etc, but I haven't found any way to get query parameters outside of the URL. It would be really really handy if this was possible!

Thanks!