docs: def handler404(request, template_name='404.html'):
      """
          404 error handler.
  
          Templates: `404.html`
          Context:
              MEDIA_URL
                  Path of static media (e.g. "media.example.org")
              STATIC_URL
      """
      t = loader.get_template(template_name) # You need to create a 404.html template.
      return http.HttpResponseNotFound(t.render(Context({
          'MEDIA_URL': settings.MEDIA_URL,
          'STATIC_URL': settings.STATIC_URL
      })))