- Plesk for Linux
gzip compression has been enabled for a domain according to this KB article.
Online optimization test tools like Google PageSpeed Insights show that gzip compression is not enabled for a this domain.
Responses are compressed by Apache and then decompressed by nginx when 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.
Apply one of the following solutions: