Amazon CloudFront allows you to to remove one or multiple files from all
edge locations prior to the expiration date set on those files. Invalidation requests for the first 1,000 files each month are provided
at no additional charge; above this level, there is a $0.005 charge for
invalidating each additional file.
To invalidate the CloudFront object, just go to your bucket, select the objects you want to
invalidate and choose CloudFront Distribution -> CloudFront Invalidate from the context menu, as shown in Fig. 1.