service正常返回byte[],HttpHeaders设置x-download不起作用仍是application/json.

晚上回家再验证。

ps：正常在response设置响应头和响应体就好，ResponesEntity应该就只是spring boot提供的构造响应体的东西。

update:

在家里并不能复现！

```

//@Controller
@RestController
public class TestController {
    @GetMapping("/test/a")
//    @ResponseBody
    public ResponseEntity<byte[]> a() throws IOException {
        Resource resource  = new ClassPathResource("a.xlsx");
        HttpHeaders headers = new HttpHeaders();
        headers.add("Content-Disposition", "attachment; filename=" + "fuck.xlsx");
        headers.add("Last-Modified", new Date().toString());
        InputStream inputStream = resource.getInputStream();
        byte[] bytes = new byte[inputStream.available()];
        inputStream.read(bytes);
        return ResponseEntity.ok().headers(headers).contentLength(bytes.length).contentType(MediaType.APPLICATION_OCTET_STREAM).body(bytes);
    }
}

```