Has there been any CORS changes implemented recently?

[zubozrout]

Hi,
I am sorry for this question, as it might not be a proper bug report and it might simply show an error on my side, but I've been using Cloudserver for storing files in a testing environment for about two years now, perhaps longer. And while I made little to no changes in my code in this respect, direct file uploads (using presigned url) recently stopped working for me for CORS reasons.

So whenever I do a request like this:
PUT: http://localhost:9000/image.jpg?X-Amz-Algorithm=...

I end up with an error 403, CORS Missing Allow Origin.

This likely used to be enough previously (from @aws-sdk/client-s3):

new PutBucketCorsCommand({
  Bucket: bucket,
  CORSConfiguration: {
    CORSRules: [{
        AllowedOrigins: [
          "*"
        ],
        AllowedMethods: [
          "PUT"
        ],
        AllowedHeaders: [
          "*"
        ],
        MaxAgeSeconds: 60000
    }]
  }
});

Now, the only solution I have is to overwrite this on the Nginx level, adding in these things to the respective location rules:

proxy_hide_header Access-Control-Allow-Origin;

if ($request_method = OPTIONS ) {
	add_header 'Access-Control-Allow-Origin' '*';
	add_header 'Access-Control-Allow-Methods' 'PUT';
	add_header 'Access-Control-Allow-Headers' 'Authorization, Origin, X-Requested-With, Content-Type, Accept';

	return 200;
}

add_header 'Access-Control-Allow-Origin' '*';

My questions are the following:

• Why could PutBucketCorsCommand be ignored? Or was it always?
• What is the proper way to do this? Is the Nginx overwrite ok?

It might be worth noting that I am using this Docker image for the Cloudserver: https://hub.docker.com/r/zenko/cloudserver/

Thank you very much.