string(259) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E4%B8%BA%E4%BD%95%E6%89%93%E4%B8%8D%E5%BC%80%E5%9B%BE%E7%BA%B8%E7%9A%84%E5%8E%9F%E5%9B%A0 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
cad为何打不开图纸的原因
