從S3下載文件時AWS令牌已過期

Question

我試圖使用適用於Android的AWS開發工具包從S3存儲桶中下載文件。下面是我使用的代碼：

CognitoCachingCredentialsProvider credentialsProvider = new CognitoCachingCredentialsProvider(
      getApplicationContext(), 
      "my identitiy pool id", // Identity Pool ID 
      Regions.AP_NORTHEAST_1 // Region 
    ); 

    AmazonS3 s3 = new AmazonS3Client(credentialsProvider); 
    TransferUtility transferUtility = new TransferUtility(s3, getApplicationContext()); 

    TransferObserver observer = transferUtility.download(
      "mybucket",  /* The bucket to download from */ 
      "logo.png", /* The key for the object to download */ 
      imageFile  /* The file to download the object to */ 
    ); 

此代碼引發以下錯誤：

E/DownloadTask: Failed to download: 8 due to The provided token has expired. (Service: Amazon S3; Status Code: 400; Error Code: ExpiredToken; Request ID: 6BEA65FAFAD54BF4) 

我剛剛創建了AWS Cognito的憑證，它cannnot到期。有什麼我做錯了嗎？

Answer 1

這可能是一個暫時的問題。過了一段時間後我重試了一遍，結果很奏效。