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One thing that I know came up for me was exactly what the contract for some if the interfaces are. A specific example I can think of is RoutingHttpHandler. It tried to create my own implementation of this, but I remember having difficulties because the interface really isn't self explanatory, and there are no comments. From the bare interface it seems that `RoutingHttpHandler.match()` should always return `this`, but that isn't what the implementations do.  When should it return `null` vs an HttpHandler that returns a 404?