Rackspace Cloud Files CDN will redownload your file from the US storage every time you put something new after the question mark:
- http://[container].cdn.cloudfiles.rackspacecloud.com/object,
- http://[container].cdn.cloudfiles.rackspacecloud.com/object?something,
- http://[container].cdn.cloudfiles.rackspacecloud.com/object?something-new.
You’ll end up having a low download speed for those URLs even though they point to one file.
So, the front side of Rackspace CDN thinks these are different objects. And the source Rackspace server sees no difference between the URLs.
This behaviour is a traffic waste.