string(234) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8D%83%E5%B7%9D%E6%8A%95%E6%94%BEroi%E6%80%8E%E4%B9%88%E7%AE%97 => Failed to connect to 101.89.159.206 port 38087: Connection refused"
千川投放roi怎么算
