string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%8E%AF%E5%A2%83%E8%AF%81%E6%8D%AE%E6%A1%88%E4%BE%8B%E5%88%86%E6%9E%90%E9%A2%98 => Failed to connect to 101.89.117.144 port 38076: Connection refused"
环境证据案例分析题
