string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A6%82%E4%BD%95%E8%AE%A1%E7%AE%97%E6%8E%A8%E5%B9%BF%E8%B4%B9%E7%94%A8%E7%8E%87 => Failed to connect to 101.89.159.206 port 38075: Connection refused"
如何计算推广费用率
