instance method call_app

# File railties/lib/rails/rack/logger.rb, line 33
        def call_app(request, env) # :doc:
          logger_tag_pop_count = env["rails.rack_logger_tag_count"]

          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) { finish_request_instrumentation(handle, logger_tag_pop_count) }

          if response.frozen?
            [status, headers, body]
          else
            response[2] = body
            response
          end
        rescue Exception
          finish_request_instrumentation(handle, logger_tag_pop_count)
          raise
        end