ResponseEntity类型返回异常问题

首先我的代码块是一个spring boot项目
@RequestMapping(value = "/download_aes_rsa", consumes = "multipart/*", headers = "content-type=multipart/form-data", method = RequestMethod.POST)
    @ApiImplicitParams({
            @ApiImplicitParam(name = "appkey", value = "appkey", required = false, dataType = "String", paramType = "header"),
            @ApiImplicitParam(name = "appsecret", value = "appsecret", required = false, dataType = "String", paramType = "header"),
            @ApiImplicitParam(name = "env", value = "env", required = false, dataType = "String", paramType = "header")})
    @ApiOperation(value = "下载非对称加密文件（RSA_AES）", nickname = "download", notes = "下载非对称加密文件（RSA_AES）", response = ResponseEntity.class)
    public ResponseEntity encryption(@ApiParam(value = "上传待加密文件", required = true) @RequestParam("file") MultipartFile multfile
            , HttpServletRequest request) throws Exception {

if (PROD.equals(request.getHeader("env"))) {
            return ResponseEntity.notFound().build();
        }
        ResponseEntity responseEntity = null;
        try {
            String aeskey = UUID.randomUUID().toString().substring(0, 16);
            String appkey = request.getHeader("appkey");
            String appSecrt = request.getHeader("appsecret");
            String env = request.getHeader("env");

String iv = getVector(appSecrt, appkey);

log.info("aeskey = {},appkey = {}, appSecrt = {}, iv = {}", aeskey, appkey, appSecrt, iv);
            //aes加密
            byte[] data = encrypt(multfile.getBytes(), aeskey, iv);
            String rsaPublicKey = null;
            if (env.equals(PROD)) {
                rsaPublicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDaYcYR1Oxy/UPyBEoVXOhp4RLWZxz2NYpFnfk72WS92YboekvW/HpQ3Nigrqz2YLgqfP3P/tW/94wj7yad3nRfrIXTUprXt2aRiJvcRfJs3TodxzGqtFPKHXLgYkzERMP9rC5TZ6ONIje69DtfjtiIJ/BKHoIvSJf2i+lVUFujYQIDAQAB";
            } else if (env.equals(DEV)) {
                rsaPublicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCSNA8iLmBHL5RcmwD8I8aN1X3WBIZpBW/KZDGkbU/MamlC+OWD1+voR1PNHF5niABOhENxfuMjZewg02EPNDEUAaO8QhMD47yNhtHqlm+d3kYXCWDEQcAVi9hFpvNeDIX6A+ZfEsN+UWOvC3lRce7EnaBZl9HWltScDPdMtSty0QIDAQAB";
            }

String encryptAesKey = encryptByPublicKey(aeskey, rsaPublicKey);

HttpHeaders headers = new HttpHeaders();//设置响应头
            headers.add("content-type", "application/zip");
            headers.add("Content-Disposition", "attachment;filename=" + multfile.getOriginalFilename());
            headers.add("ck", encryptAesKey);
            headers.add("aeskey", aeskey);
            headers.add("iv", iv);

if (data != null) {
                responseEntity = new ResponseEntity(data, headers, HttpStatus.OK);
            }

} catch (Exception e) {
            log.error("error = {}", e);
        }
        return responseEntity;
    }

理论上我的返回值应该是一个文件下载实际上原版的swaggerui中也是如此
![输入图片说明](https://images.gitee.com/uploads/images/2019/0718/172001_6e008a39_5127083.png "微信图片_20190718171936.png")

但是在bootstrap-ui中却是显示的强制转化为string形式的乱码文字
![输入图片说明](https://images.gitee.com/uploads/images/2019/0718/172101_8ca2c215_5127083.png "屏幕截图.png")

不知道此类问题该如何设置，谢谢

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