Symptoms
Gzip compression has been enabled according to the article “How to enable GZIP compression in Apache“
Online optimization test tools like Google PageSpeed Insights show that gzip compression is not enabled for a domain.
The options Smart static files processing and Serve static files directly by nginx are enabled for a domain in Plesk at Domains > example.com > Apache & nginx Settings.
Cause
Responses are compressed by Apache and then decompressed by nginx.
Resolution
- Log into Plesk
- Navigate to Domains > example.com > Apache & nginx Settings
- Disable options Smart static files processing and Serve static files directly by nginx and Applychanges
