string(235) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E4%BA%8C%E7%BA%A7%E5%BB%BA%E9%80%A0%E5%B8%88%E4%B9%A6%E6%9C%AC => Failed to connect to 101.89.117.144 port 38076: Connection refused"
2021二级建造师书本
