call_app

# File railties/lib/rails/rack/logger.rb, line 32
        def call_app(request, env) # :doc:
          instrumenter = ActiveSupport::Notifications.instrumenter
          instrumenter.start "request.action_dispatch", request: request
          logger.info { started_request_message(request) }
          status, headers, body = @app.call(env)
          body = ::Rack::BodyProxy.new(body) { finish(request) }
          [status, headers, body]
        rescue Exception
          finish(request)
          raise
        ensure
          ActiveSupport::LogSubscriber.flush_all!
        end