string(239) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=caj%E6%96%87%E4%BB%B6%E6%80%8E%E4%B9%88%E8%BD%AC%E6%8D%A2%E6%88%90pdfipad => Failed to connect to 61.171.74.35 port 38027: Connection refused"
caj文件怎么转换成pdfipad
