string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B7%A8%E9%87%8F%E5%8D%83%E5%B7%9D%E6%8A%95%E6%94%BE%E6%95%99%E7%A8%8B => Failed to connect to 125.88.227.171 port 38062: Connection refused"
巨量千川投放教程
