java亚马逊图片上传问题：AmazonClientException

Question

在尝试以适当的网络速度将图像上传到s3时，其工作正常。但在一些设备之间的上传，如果网络不一致或薄弱，那么下面的错误问题就来了。请帮我解决这个错误

com.amazonaws.AmazonClientException: Unable to execute HTTP request: Unable to resolve host "s3.eu-west-1.amazonaws.com": No address associated with hostname
      at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:441)
      at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:212)
      at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:4659)
      at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1752)
      at com.amazonaws.mobileconnectors.s3.transferutility.UploadTask.uploadSinglePartAndWaitForCompletion(UploadTask.java:219)
      at com.amazonaws.mobileconnectors.s3.transferutility.UploadTask.call(UploadTask.java:93)
      at com.amazonaws.mobileconnectors.s3.transferutility.UploadTask.call(UploadTask.java:49)
      at java.util.concurrent.FutureTask.run(FutureTask.java:266)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
      at java.lang.Thread.run(Thread.java:764)