Fast 404 module and Drupal core

Question

I can see that Fast 404 module has been added to drupal core since 7.9 version. So in order to use it on my drupal site(without installing Fast 404 module),is there I need to do in the settings.php module? thanks

Answer 1

Go to the sites/default directory. Open up to the setting.php file. Around line 500 uncomment this drupal_fast_404(); by removing #

Source