[kanzure]

    > Actually paperclip doesn't rely on HTTParty

I thought it uses aws-sdk? Looks like it doesn't. Huh..

https://github.com/aws/aws-sdk-ruby/blob/master/Gemfile#L17

[benatkin]

It's like ActiveRecord, where it comes with an adapter for several backends, but in order to use a backend you need to install a library gem which is not a dependency of ActiveRecord.