Force setup X-Frame-Options Django

I tried different methods to setup X-Frame-Options to 'SAMEORIGIN' in the Django-server responses, but it wasn't help:

1. I removed XFrame package from the middleware in settings.py.
2. I putted X_FRAME_OPTIONS='SAMEORIGIN' to settings.py
3. I added 'X-Frame-Options' to response object with the same value in my view in which I wanted to use the <iframe>
4. I tried to add @xframe_options_sameorigin decorator to my view.
5. I also changed /etc/apache2/apache2.conf, putted Header always set X-Frame-Options "SAMEORIGIN" into it.

Then I tried to restart apache2 service after all my actions but the result always the same:

X-Frame-Options setted as 'DENY'

My Django version is 2.2.4.

Sorry, some of this methods have worked. Update of browser page has not worked at first time, but after few minutes, it has worked. All done, thank you.