string(241) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E7%BD%91%E8%AF%BE%E5%93%AA%E4%B8%AAapp%E5%A5%BD%E7%94%A8 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
二建网课哪个app好用
