load_rack_cache

# File railties/lib/rails/application/default_middleware_stack.rb, line 76
        def load_rack_cache
          rack_cache = config.action_dispatch.rack_cache
          return unless rack_cache

          begin
            require 'rack/cache'
          rescue LoadError => error
            error.message << ' Be sure to add rack-cache to your Gemfile'
            raise
          end

          if rack_cache == true
            {
              metastore: "rails:/",
              entitystore: "rails:/",
              verbose: false
            }
          else
            rack_cache
          end
        end