string(250) "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%E6%96%B9%E6%A1%88%E6%9C%89%E5%93%AA%E4%BA%9B => Failed to connect to 14.18.117.71 port 38093: Connection refused"
app推广渠道方案有哪些
