string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E4%BC%9A%E9%82%A3%E4%B8%AA%E8%80%81%E5%B8%88%E8%AE%B2%E8%AF%BE%E6%AF%94%E8%BE%83%E5%A5%BD => Failed to connect to 101.89.143.195 port 38205: Connection refused"
注会那个老师讲课比较好
