下载失败:org.springframework.web.client.HttpClientErrorException$NotFound: 404 Not Found: [{"timestamp":"2025-07-08T04:27:05.255+00:00","status":404,"error":"Not Found","message":"","path":"/demo/%E7%AC%AC%E4%B9%9D%E8%AF%BE%EF%BC%9ALTE%E5%8A%9F%E7%8E%87%E6%8E%A7%E5%88%B6.pdf"}]