Commits on Jul 25, 2021

1. Make Router generic over its route 🚏 …

   Our `Router` and `RouteHandler` infrastructure was designed to work
   with plain `URL`'s on its main APIs. Despite URLs being the critical
   piece of information to route (e.g. in our `TrieRouter`), in certain
   situations the URL doesn't contain all the information, which limits
   the Routing infrastructure capabilities. One such example would be in
   a server middleware router, where the HTTP method would likely be
   required information to pass on to handlers to perform adequate routing.
   
   To remove this restriction, a new `Routable` protocol was created to
   represent a routable type, which only needs to provide a `url` and is
   forwarded by the router to the handler upon a successful match. To make
   it easier to unpack any additional information on the handlers and have
   more type safety, it was made an `associatedtype` of both `Router` and
   `RouteHandler`, effectively turning it into a new generic `R`.
   
   ## Changes
   
   - Add new `Routable` protocol, add default conformance to `URL`.
   
   - Add new `associatedtype R: Routable` to `Router` and `RouteHandler`.
   
   - Update `Router` and `RouterHandler` APIs to receive a route of type
   `R`.
   
   - Add new `RouteHandler.eraseToAnyRouteHandler` helper.

   

   p4checo committed Jul 25, 2021
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