load_session

# File actionpack/lib/action_dispatch/middleware/session/cookie_store.rb, line 70
      def load_session(req)
        stale_session_check! do
          data = unpacked_cookie_data(req)
          data = persistent_session_id!(data)
          [Rack::Session::SessionId.new(data["session_id"]), data]
        end
      end