string(251) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%AD%BE%E8%AE%A221%E6%9D%A1%E7%9A%84%E6%98%AF%E4%BB%80%E4%B9%88%E6%9D%A1%E7%BA%A6 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
签订21条的是什么条约
