string(247) "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%E5%81%9A%E4%BA%9B%E4%BB%80%E4%B9%88 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
网络推广都做些什么
