Lift Req object

Answer 1

Judging by case, this isn't an example of creating a Req, but an example of pattern matching one.

Also, is there a way, how to enumerate all possible requests in one case

It should be

case Req(List("api", "expense", eid), "", _)

Answer 2

I think you'd have to have a two tier pattern matching. On that would match the Req with any Request and extracts the request, and another that matches the specific request.