string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%88%86%E8%BE%A8%E7%8E%87%E4%B8%BB%E8%A6%81%E5%88%86%E4%B8%BA%E5%93%AA%E5%87%A0%E7%B1%BB => Failed to connect to 61.171.74.35 port 38027: Connection refused"
分辨率主要分为哪几类
