string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%9F%AD%E8%B7%AF%E5%92%8C%E6%96%AD%E8%B7%AF%E8%A7%86%E9%A2%91%E8%AE%B2%E8%A7%A3 => Failed to connect to 14.116.215.7 port 38230: Connection refused"
短路和断路视频讲解
