string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%9F%A9%E6%94%BE%E8%80%81%E5%B8%88%E8%AE%B2%E7%9A%84%E4%BA%8C%E5%BB%BA%E5%A6%82%E4%BD%95 => Failed to connect to 14.18.117.71 port 38093: Connection refused"
韩放老师讲的二建如何
