string(310) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E7%BB%9C%E6%8E%A8%E5%B9%BF%E9%83%BD%E6%9C%89%E4%BB%80%E4%B9%88%E6%B8%A0%E9%81%93%E5%91%A2%E6%80%8E%E4%B9%88%E8%B5%9A%E9%92%B1%E7%9A%84 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
网络推广都有什么渠道呢怎么赚钱的
