An AWS Elemental MediaStore container is a namespace that holds folders and objects. You use a container endpoint to create, read, and delete objects.
curl \ -H "Authorization: $API_KEY" \ http://mediastore.us-east-1.amazonaws.com/#X-Amz-Target=MediaStore_20170901.TagResource
curl \ -H "Authorization: $API_KEY" \ http://mediastore.us-east-1.amazonaws.com/#X-Amz-Target=MediaStore_20170901.GetCorsPolicy