service/s3: S3 Object Lambda is a new S3 feature that enables users to apply their own custom code to process the output of a standard S3 GET request by automatically invoking a Lambda function with a GET requestservice/s3control: S3 Object Lambda is a new S3 feature that enables users to apply their own custom code to process the output of a standard S3 GET request by automatically invoking a Lambda function with a GET request.