string(250) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E9%80%9F%E5%8D%95%E4%BD%8Dmbps%E4%B8%8Emb%2Fs%E7%9A%84%E5%8C%BA%E5%88%AB => Failed to connect to 101.89.143.195 port 38109: Connection refused"
网速单位mbps与mb/s的区别
