Good news for people using CDNs or bucket names that are not well-formed. As of today we support a new parameter called
url_prefix for our S3 Store robot.
Before, we would always return URLs prefixed with
<bucket> is the name of the S3 bucket where we stored the file.
With the new option you can now define any prefix, for example
"http://E123456.cloudfront.net/" in case that is the name of your CloudFront domain.