string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%91%E5%8D%97%E5%A4%A7%E5%AD%A6%E8%80%83%E7%A0%94%E7%BD%91%E4%B8%8A%E7%A1%AE%E8%AE%A4 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
云南大学考研网上确认
