string(283) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E5%AE%89%E5%B8%88%E6%8A%80%E6%9C%AF%E5%9F%BA%E7%A1%80%E9%87%8D%E7%82%B9%E7%9F%A5%E8%AF%86%E5%BD%92%E7%BA%B3 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
注安师技术基础重点知识归纳
