string(243) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E4%B8%80%E5%BB%BA%E5%BB%BA%E7%AD%91%E5%AE%9E%E5%8A%A1%E6%94%B9%E5%8A%A8 => Failed to connect to 101.91.112.32 port 38221: Connection refused"
2021一建建筑实务改动
