Very quick one here – a lot of speed testing websites such as Pingdom and Google PageSpeed require you to enable “Vary: Accept-Encoding”.
And because it’s sooo simple to turn on in NGINX here’s how you do it:
Modify the file /etc/nginx/nginx.conf and add gzip_vary on; to the file (preferably under the gzip compression section).
# Compression
gzip on;
gzip_comp_level 5;
gzip_min_length 512;
gzip_buffers 8 64k;
gzip_types text/plain text/css text/javascript
application/x-javascript application/javascript;
gzip_proxied any;
gzip_vary on;
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