我在token里面加上mimeLimit為“mimeLimit", "image/png”，用js-sdk上傳，返回失敗

我在服務(wù)端校驗(yàn)上傳文件的mime類型為image/png，但是客戶端通過js-sdk上傳的時(shí)候，在“ERROR” 函數(shù)返回err.message為"HTTP 錯(cuò)誤", error.response為"{"error":"expired token"}"，errTip為：客戶端認(rèn)證授權(quán)失敗。請(qǐng)重試或提交反饋。(401：expired token)。如果服務(wù)端不做mime類型限制的話就可以上傳成功，這是怎么回事？

服務(wù)端返回uptoken函數(shù)代碼如下：

    public ResponseEntity<?> getUptoken(@RequestParam int name) {
        Auth auth = Auth.create(accessKey, secretKey);
        UploadTokenResult uploadTokenResult = null;
        StringMap putPolicy = new StringMap();
        if (name == BucketNameEnum.VIDEO.getValue()) {
            putPolicy.put("mimeLimit", "video/mp4");
            uploadTokenResult = new UploadTokenResult(auth.uploadToken(videoBucketName, null, 3600, putPolicy));
        } else {
            putPolicy.put("mimeLimit", "image/png");
            uploadTokenResult = new UploadTokenResult(auth.uploadToken(imgBucketName, null, 3600, putPolicy));
        }
        return new ResponseEntity<>(uploadTokenResult, HttpStatus.OK);
    }