@GetMapping("/download/{filename:.+}")
    @ResponseBody
    public ResponseEntity<Resource> downloadFile(@PathVariable String filename) {

        Resource resource = storageService.loadAsResource(filename);

        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION,
                        "attachment; filename=\"" + resource.getFilename() + "\"")
                .body(resource);
    }