string(228) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E9%80%9Fmb%E5%92%8Cmbps%E7%9A%84%E5%8C%BA%E5%88%AB => Failed to connect to 125.88.227.171 port 38114: Connection refused"
网速mb和mbps的区别
