string(238) "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%E7%9C%8B%E8%B0%81%E7%9A%84%E5%A5%BD => Failed to connect to 14.18.117.71 port 38220: Connection refused"
二建网课看谁的好
