string(268) "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%90%8E%E5%B0%B1%E5%8D%A1%E4%BD%8F%E4%B8%8D%E5%8A%A8 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
cad一打开图纸后就卡住不动
