string(270) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%AE%BD%E5%B8%A6%E6%B5%8B%E9%80%9F%E5%8D%95%E4%BD%8Dmbps%E5%92%8Cm%E6%80%8E%E6%A0%B7%E6%8D%A2%E7%AE%97 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
宽带测速单位mbps和m怎样换算
