Set up browser cache and the If-Modified-Since header
Correct configuration of the Last-Modified and If-Modified-Since headers:
- saves traffic;
- reduces server load;
- speeds up indexing by search engines.
Your static files are served through Nginx, so the If-Modified-Since header was not working correctly.
The proper setup is done either through hosting support or by a system administrator.
Check link: https://last-modified.com/ru/if-modified-since.html
For testing, enter the logo URL there: https://rybalkin.bar/wp-content/uploads/2020/12/logo-white.png
More
22.01.2022
