小程序，对于iphone 11服务器端显示cookie为空，而其他版本的iphone没有这个问题，有大侠知道什么原因？

  'user-agent' => 'Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1 MicroMessenger/6.5 mpcrawler',   'content-length' => '199',   'accept' => '*/*',   'accept-encoding' => 'gzip,deflate',   'accept-language' => 'zh-CN,zh;q=0.9,en;q=0.8',   'cache-control' => 'no-cache',   'connection' => 'keep-alive',   'content-type' => 'json',   'cookie' => '', ......