Objects in S3 can have custom metadata associated with them. Look at the returned data for the HeadObject call.[0] It's not advertised in the documentation, bu

Objects in S3 can have custom metadata associated with them. Look at the returned data for the HeadObject call.[0] It's not advertised in the documentation, but HeadObject(Bucket, Key)['Metadata'] is a neat dictionary of custom values. 0: https://docs.aws.amazon.com/AmazonS3/latest/API/API_HeadObject.html https://docs.aws.amazon.com/AmazonS3/latest/API/API_HeadObje...