run_callbacks

# File actionpack/lib/action_controller/dispatcher.rb, line 174
      def run_callbacks(kind, enumerator = :each)
        callbacks[kind].send!(enumerator) do |callback|
          case callback
          when Proc; callback.call(self)
          when String, Symbol; send!(callback)
          when Array; callback[1].call(self)
          else raise ArgumentError, "Unrecognized callback #{callback.inspect}"
          end
        end
      end