string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%AF%B7%E9%97%AE%E6%80%8E%E4%B9%88%E6%8E%A8%E5%B9%BF%E6%95%88%E6%9E%9C%E5%A5%BD%E5%91%A2 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
请问怎么推广效果好呢
