Cache-Control Builder
Build a Cache-Control header from presets or directives and see what each one does.
Cache-Control: public, max-age=31536000, immutable
What it means
- public — Any cache (browser, CDN, proxy) may store the response — even for authenticated requests.
- max-age=31536000 — Fresh for 1 year(s) in any cache.
- immutable — The response will never change while fresh — browsers skip revalidation even on reload.
- Only use immutable for files whose URL changes when the content changes (e.g. app.3f9c2.js).
Server configuration
location ~* \.(js|css|png|jpg|svg|woff2)$ {
add_header Cache-Control "public, max-age=31536000, immutable";
}