string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BC%98%E5%8C%96%E7%BD%91%E7%AB%99%E7%9A%84%E6%8A%80%E5%B7%A7 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
优化网站的技巧
