Can I control the cache on Rackspace cloud storage?

342860 pts.
Tags:
Cloud storage
Rackspace
On our website, users are allowed to upload avatars (and they change quite often). We also have a strict URL that won't change (because it's displayed in some cached parts of the site). We tried to set on my Rails application the following fog attributes to disable caching but we're not getting anything out of it. Here's the code:
config.fog_attributes = {'Cache-Control' => 'max-age=1', 'Expires' => 1.day.ago.httpdate}
So basically what's happening now is when a user uploads a new avatar, it takes hours for the previous one to go away. Does anyone know how I can control the cache on Rackspace Cloud Storage?

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