string(228) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E8%BD%AC%E6%88%90pdf%E6%97%A0%E6%B3%95%E6%89%93%E5%BC%80 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
cad转成pdf无法打开
