Gotcha. I thought you were just looking at throwing regexes at the request URI, but you're going one further. At the risk of over-stretching the analogy, it looks to me like you're going to do compile-time method dispatching and type checking, instead of at run-time. I can see value in that, although we could debate endlessly whether that is the perlish way ;)

I'm interested to see what you come up with. I suppose I always felt that the uri-path is similar to a method name, while the query parameters are similar to its input parameters. Although CA::Dispatch's named captures muddles the water there, and that's also quite a useful feature. I'm still mostly using old-fashioned urls like /book/edit?id=1 instead of the more modern /book/edit/1, but I'm slowly catching up :)