1.获取用户当前客户端的userAgent
var user_agent = res.headers["user-agent"].toLowerCase();
//判断是否是手机端
var is_mobile = /android|webos|iphone|ipad|ipod|blackberry|iemobile|opera mini/i.test(user_agent );
2. 获取当前url协议(http/https)
res.protocol;
3.获取hostname
// Host: "example.com:3000"
req.hostname
// => "example.com"
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