string(243) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E6%89%93%E5%BC%80%E5%9B%BE%E7%BA%B8%E5%B0%B1%E6%9C%AA%E5%93%8D%E5%BA%94 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
cad打开图纸就未响应
