- Plesk 12.5 for Linux
- Plesk Onyx for Linux
- Cache expiration is enabled in nginx, but cache expiration headers are not returned by server.
- Wordpress is installed.
- In Domains > example.com > Hosting settings for a domain PHP handler is set as "FPM application served by Apache".
This is Plesk internal issue with ID #PPPM-4413 , which is planned to be fixed in future Plesk updates
Change PHP handler to "FPM application served by Apache" in Domains > example.com > Hosting settings .