add_route

# File actionpack/lib/action_dispatch/routing/route_set.rb, line 369
      def add_route(app, conditions = {}, requirements = {}, defaults = {}, name = nil, anchor = true)
        raise ArgumentError, "Invalid route name: '#{name}'" unless name.blank? || name.to_s.match(/^[_a-z]\w*$/)

        path = build_path(conditions.delete(:path_info), requirements, SEPARATORS, anchor)
        conditions = build_conditions(conditions, valid_conditions, path.names.map { |x| x.to_sym })

        route = @set.add_route(app, path, conditions, defaults, name)
        named_routes[name] = route if name
        route
      end