string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%90%9C%E7%B4%A2%E6%8E%92%E5%90%8D%E4%B8%BB%E8%A6%81%E5%8F%82%E8%80%83%E5%93%AA%E4%B8%A4%E4%B8%AA%E5%9B%A0%E7%B4%A0 => Failed to connect to 101.89.143.195 port 38205: Connection refused"
搜索排名主要参考哪两个因素
