string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E5%BB%BA%E6%B3%95%E8%A7%84%E8%AF%BE%E7%A8%8B%E7%9B%AE%E5%BD%95 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
一建法规课程目录
