string(274) "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%E7%BD%91%E7%BB%9C%E8%AF%BE%E7%A8%8B%E9%9C%80%E8%A6%81%E4%BB%80%E4%B9%88%E6%89%8B%E7%BB%AD => Failed to connect to 61.171.74.35 port 38027: Connection refused"
一建网络课程需要什么手续
