string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E7%BA%A7%E7%BB%8F%E6%B5%8E%E5%B8%88%E5%AD%A6%E9%9C%B8%E7%AC%94%E8%AE%B0%E8%80%83%E8%BF%87%E7%9A%84 => Failed to connect to 101.89.166.210 port 38089: Connection refused"
中级经济师学霸笔记考过的
