string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E9%80%A0%E8%AF%BE%E7%A8%8B%E6%9C%89%E5%87%A0%E9%97%A8 => Failed to connect to 125.88.227.171 port 38062: Connection refused"
一造课程有几门
