string(242) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%AE%BD%E5%B8%A6mb%E5%92%8Cmb%E6%9C%89%E4%BB%80%E4%B9%88%E4%B8%8D%E5%90%8C => Failed to connect to 14.18.117.71 port 38041: Connection refused"
宽带mb和mb有什么不同
