SignatureDoesNotMatch in aws s3 c# while getting presigned url

Question

Hi I have mvc application in which I want to get url of uploaded image in amazon s3 but after getting url its not able to get open in browser code to get Url is

  var expiryUrlRequest = new GetPreSignedUrlRequest();
        expiryUrlRequest.BucketName = BUCKET_NAME;
        expiryUrlRequest.Key = "uploads/participantid_" + v1+ "/taskid_" + v2 + "/" + 0 + ".mp4";
        expiryUrlRequest.ContentType = "Video/mp4";
        expiryUrlRequest.Expires = DateTime.Now.AddYears(10);

     string    url = client.GetPreSignedURL(expiryUrlRequest);

I also get url but after pestling it into browser it show signature does not match.

Answer 1

After Generating Presigned URL and binding to html. Signature with hex value is changing to asci symbols.

Make sure to create signature for presigned url without hex value

Answer 2

Some suggestions:

1. Specify the verb: expiryUrlRequest.Verb = HttpVerb.GET;
2. Check the bucket policy whether the IAM role / AWS account whose access keys you are using to access this bucket, is allowed access to the bucket (use tool: https://awspolicygen.s3.amazonaws.com/policygen.html )
3. Use an expiry which is less than 7 days (won't help in solving this issue, but the maximum allowed value is 7 days)
4. Try ContentType as "video/mp4" (worth a shot).