string(283) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B9%BF%E5%91%8A%E5%92%8C%E5%85%AC%E5%85%B3%E7%9A%84%E7%9B%B8%E5%90%8C%E7%82%B9%E4%B8%8E%E4%B8%8D%E5%90%8C%E7%82%B9 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
广告和公关的相同点与不同点
