failsafe_rescue (ActionController::Dispatcher)

    # File lib/action_controller/dispatcher.rb, line 186
          def failsafe_rescue(exception)
            self.class.failsafe_response(@output, '500 Internal Server Error', exception) do
              if @controller ||= defined?(::ApplicationController) ? ::ApplicationController : Base
                @controller.process_with_exception(@request, @response, exception).out(@output)
              else
                raise exception
              end
            end
          end