So I came upon a requirement at work to support accepting multiple ids in the Url of a "REST" request. I have no idea if this is actually considered RESTful or not, but the idea was to formulate the URL like so:
The idea was to be able to retrieve multiple instances of FooResource with one request.
So, I came up with the following MVC ActionFilter to make my life a little bit easier:
public class ArrayInputAttribute : ActionFilterAttribute