Cache-Control
The primary header for controlling caching behavior, defining how and for how long responses can be cached.
Syntax
Cache-Control: <directive>, <directive>Example
Cache-Control: public, max-age=31536000, immutableDescription
Cache-Control is the primary mechanism for controlling HTTP caching. Specifies directives for browser and CDN/proxy caches.
Key directives: max-age=N, no-cache (must revalidate), no-store (never cache), public, private, must-revalidate, immutable.
Best practice: long max-age with versioned URLs for static assets, short max-age or no-cache for HTML.
How real sites send this header
Home-page responses of 503 popular sites from the enterno.io /check catalogue, checked in the last 30 days.
74.2%
(373 of 503) send Cache-Control.
Most common values:
public, max-age=0, must-revalidate— 38 sitesno-cache, no-store, must-revalidate— 21 sitesno-cache— 20 sites
See it on: google.com, yandex.ru, discord.com, github.com, habr.com
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