PutObjectAsync() not working for R2 with AWS S3 .NET SDK

Developers
1

I’m trying to upload an object to Cloudflare R2 by using below code which uses AWS S3 SDK, but it gives me {“The remote server returned an error: (501) Not Implemented.”} exception, Error message was “STREAMING-AWS4-HMAC-SHA256-PAYLOAD not implemented”. Can anyone give me a sample to upload object Cloud-flare R2 by using AWS S3 .NET SDK

var config = new AmazonS3Config
                    {
                        ServiceURL = "**************************.r2.cloudflarestorage.com",
                        ForcePathStyle = true
                    };

                    var s3Client = new AmazonS3Client(accesskey, secretkey, config);

                    var request = new PutObjectRequest
                    {
                        BucketName = bucketName,
                        Key = $"{file.FileName}",
                        FilePath = filePath,
                    };

                    var response = await s3Client.PutObjectAsync(request);
2

Hello there!

Check here:
S3 API · Cloudflare R2 docs and our examples:
Examples · Cloudflare R2 docs

The most common tips to fix the 501 error can be found here:

Hope that it helps!

Take care!

3

There is no example available for .NET on https://developers.cloudflare.com/r2/examples/
However I solved the problem by the sample given by KianNH on https://github.com/cloudflare/cloudflare-docs/issues/4683

If anyone facing same issue, just use this “DisablePayloadSigning = true” in PutObjectRequest to disable sigv4 streaming

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