heroku_static_cache_control.rb

if defined?(Heroku::StaticAssetsMiddleware)
  puts "Carefully adjusting Heroku::StaticAssetsMiddleware"
  class Heroku::StaticAssetsMiddleware
    def can_cache?(reply)
      status, headers, body = reply
      # if there's already a "Cache-Control" header, don't override it
      body.kind_of?(Rack::File) and status.to_i == 200 and !headers.has_key?("Cache-Control")
    end
  end
end