string(261) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=app%E6%8E%A8%E5%B9%BF%E6%B8%A0%E9%81%93%E8%AF%A5%E6%80%8E%E4%B9%88%E5%81%9A%E5%A5%BD%E5%91%A2 => Failed to connect to 101.89.166.210 port 38089: Connection refused"
app推广渠道该怎么做好呢
