string(280) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E7%BA%A7%E5%BB%BA%E9%80%A0%E5%B8%88%E6%95%99%E6%9D%902021%E5%B9%B4%E4%BC%9A%E6%94%B9%E7%89%88%E5%90%97 => Failed to connect to 101.89.159.206 port 38075: Connection refused"
二级建造师教材2021年会改版吗
