string(304) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E4%B8%80%E6%89%93%E5%BC%80%E5%9B%BE%E7%BA%B8%E5%B0%B1%E8%87%B4%E5%91%BD%E9%94%99%E8%AF%AF%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B%E5%84%BF => Failed to connect to 14.18.117.71 port 38133: Connection refused"
cad一打开图纸就致命错误怎么回事儿
