node获取referer
在request(请求的对象)的header对象中,headers对象的格式 如下:{ host: '127.0.0.1:3000', connection: 'keep-alive', accept: 'application/json, text/javascript, */*; q=0.01', origin: 'http://127.0.0.1:5000', 'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.32