string(256) "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%E6%8E%A8%E5%B9%BF%E8%B4%B9%E7%94%A8%E9%AB%98%E5%90%97 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
网络广告推广费用高吗
