string(250) "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%E4%B8%80%E7%9B%B4%E8%BD%AC%E5%9C%88%E5%9C%88 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
cad打开图纸一直转圈圈
