unpacked_cookie_data

# File actionpack/lib/action_dispatch/middleware/session/cookie_store.rb, line 92
        def unpacked_cookie_data(req)
          req.fetch_header("action_dispatch.request.unsigned_session_cookie") do |k|
            v = stale_session_check! do
              if data = get_cookie(req)
                data.stringify_keys!
              end
              data || {}
            end
            req.set_header k, v
          end
        end