string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E7%BB%9C%E5%B9%BF%E5%91%8A%E8%AE%A1%E8%B4%B9%E6%96%B9%E5%BC%8F => Failed to connect to 14.18.117.71 port 38164: Connection refused"
网络广告计费方式
