string(239) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%8A%95%E6%94%BE%E8%BD%AC%E5%8C%96%E7%8E%87%E6%80%8E%E4%B9%88%E7%AE%97 => Failed to connect to 101.91.112.32 port 38221: Connection refused"
投放转化率怎么算
