In addition to Cloudflare's CDN caching static content and auto-minification of CSS, JS & HTML to speed up your site, Cloudflare also provides gzip and brotli compression to help site owners.
Cloudflare will return gzip or brotli encoded responses to compatible clients / browsers for the following content-types:
text/html text/richtext text/plain text/css text/x-script text/x-component text/x-java-source text/x-markdown application/javascript application/x-javascript text/javascript text/js image/x-icon application/x-perl application/x-httpd-cgi text/xml application/xml application/xml+rss application/json multipart/bag multipart/mixed application/xhtml+xml font/ttf font/otf font/x-woff image/svg+xml application/vnd.ms-fontobject application/ttf application/x-ttf application/otf application/x-otf application/truetype application/opentype application/x-opentype application/font-woff application/eot application/font application/font-sfnt application/wasm
If you do not want a particular response from your origin to be encoded, you can disable this by setting cache-control: no-transform
at your origin and turning Origin Cache Control -> On using a Page Rule.
How do I enable Brotli compression?
You can locate the setting for Brotli under the Speed section of your website's settings: