I used web.py to do a similar process about 1.5 years ago. In that, I mapped the GET and POST elements to functions which then did whatever I needed them to do.

This makes it even easier and I see it having a good fit in hacking up PoC APIs. In my case, I was querying some databases and aggregating data for display in a web page as well as via XML/JSON in a RESTful interface. This would make the XML/JSON stuff very easy indeed.