string(299) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%9C%89%E7%9A%84cad%E5%9B%BE%E7%BA%B8%E6%89%93%E4%B8%8D%E5%BC%80%2C%E6%9C%89%E7%9A%84%E5%8F%AF%E4%BB%A5%E6%89%93%E5%BC%80%E6%80%8E%E4%B9%88%E5%8A%9E => Received HTTP code 403 from proxy after CONNECT"
有的cad图纸打不开,有的可以打开怎么办
