router.get("/userMiddleware") { (middleware: UserMiddleware, query: MyQuery?, respondWith: ([User]?, RequestError?) -> Void) in
            print("GET array with optional parameters on /userMiddleware - received header \(middleware.header)")
            if let query = query {
                let matchedUsers = userArray.filter { $0.id == query.id }
                respondWith(matchedUsers, nil)