AWS S3 PreSignedUrl Upload Error

Question

I'm trying to upload files to S3 storage using the .Net SDK, and am seeing the following error response when PUTing to the pre signed URL provided by AWS:

The bucket you are attempting to access must be addressed using the specified endpoint

Here's the .Net code - I've confirmed my bucket is located in USWest2.

var amazonS3Client = new AmazonS3Client(accessKey, secretKey, RegionEndpoint.USWest2);
    // Generate a pre-signed URL.
    string folderName = "MyFolder";
    string key = "TestKey";
    GetPreSignedUrlRequest request = new GetPreSignedUrlRequest
    {
      BucketName = _bucketName,
      Key = folderName + "/" + key,
      Verb = HttpVerb.PUT,
      Expires = DateTime.Now.AddMinutes(5)
    };
    var uri = Uri(_amazonS3Client.GetPreSignedURL(request));

    // Upload a file using the pre-signed URL.
    Stream stream = ... // This is set elsewhere, contains a data stream.
    ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
    HttpWebRequest httpRequest = WebRequest.Create(uri) as HttpWebRequest;
    httpRequest.Method = "PUT";
    using (Stream dataStream = httpRequest.GetRequestStream())
    {
      byte[] buffer = new byte[8000];
      int bytesRead = 0;
      while ((bytesRead = stream.Read(buffer, 0, buffer.Length)) > 0)
      {
        dataStream.Write(buffer, 0, bytesRead);
      }
    }
    HttpWebResponse response = httpRequest.GetResponse() as HttpWebResponse;
    if(response.StatusCode != HttpStatusCode.OK)
      throw new Exception("Error uploading to AWS: " + response.StatusDescription);

Marty · Accepted Answer · 2016-09-30 18:23:01Z

0

This was ultimately caused because the URL returned by the call:

var uri = Uri(_amazonS3Client.GetPreSignedURL(request));

Was of the format:

https://s3-us-west-2.amazonaws.com/....

But AWS redirected this to:

https://s3.amazonaws.com/....

By using the latter URL as the beginning of my "pre signed URL", the files now upload correctly.

answered Sep 30, 2016 at 18:23

Marty

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