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In "GlobalSetting.redirect_avatar_requests" mode, when the application gets an avatar request it returns a "redirect" to the S3 CDN. This shields the application from caching avatars and downloading from S3. However clients will make 2 requests per avatar. (one to get redirect, second to get avatar) A one hour cache on a redirect means there may be an increase in CDN traffic, given more clients will ask for the redirect every hour. This may also lead to an increase in origin requests to the application. To mitigate lets cache the CDN URL for 1 day. The downside is that any changes to S3 CDN need extra care to allow for the extra 1 day delay. (leave data around for 1 extra day) |
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