Rails 3.1 Assets on S3 with HTTPS

carrierwave.rb

if Rails.env.production?
  CarrierWave.configure do |config|
    config.fog_credentials = {
      provider:               'AWS',
      aws_access_key_id:      ENV['AWS_ACCESS_KEY'],
      aws_secret_access_key:  ENV['AWS_ACCESS_SECRET'],
      region:                 'us-east-1'
    }
    config.fog_host       = "//#{ENV['MEDIA_BUCKET']}.s3.amazonaws.com"
    config.fog_directory  = ENV['MEDIA_BUCKET']
    config.fog_attributes = {'Cache-Control' => 'max-age=315576000'}
    config.storage = :fog
  end
elsif Rails.env.development?
  CarrierWave.configure do |config|
    config.storage = :file
    config.enable_processing = false
  end
elsif Rails.env.test? or Rails.env.cucumber?
  CarrierWave.configure do |config|
    config.storage = :file
    config.enable_processing = false
  end
end

deploy.rake

ENV['AWS_ACCESS_KEY'] = 'XXX'
ENV['AWS_ACCESS_SECRET'] = 'XXXXXX'
ENV['AWS_BUCKET'] = 'bucket-example-com'

desc "deploys to heroku after uploading assets to S3"
task deploy: [:environment, 'assets:precompile'] do
  puts `git push heroku`
  puts `rake assets:clean`
end

Gemfile

gem 'fog'         # Storage on S3 for carrierwave
gem 'rmagick'     # Resizes images and makes thumbnails
gem 'carrierwave' # Image attachments, newer version doesn't work with local files preview hack
gem 'asset_sync'  # Syncs assets to S3

production.rb

config.action_controller.asset_host = "//#{ENV['AWS_BUCKET']}.s3.amazonaws.com"