instance method call_app

# File railties/lib/rails/rack/logger.rb, line 31
        def call_app(request, env) # :doc:
          instrumenter = ActiveSupport::Notifications.instrumenter
          handle = instrumenter.build_handle("request.action_dispatch", { request: request })
          handle.start

          logger.info { started_request_message(request) }
          status, headers, body = response = @app.call(env)
          body = ::Rack::BodyProxy.new(body, &handle.method(:finish))

          if response.frozen?
            [status, headers, body]
          else
            response[2] = body
            response
          end
        rescue Exception
          handle.finish
          raise
        ensure
          ActiveSupport::LogSubscriber.flush_all!
        end