HTTP headers
Age HTTP Header Meaning
Age says how many seconds a cached response has already been stored.
Meaning
A cache is reporting the response's apparent resident time.
Where it appears
CDNs, proxies, and shared caches add it to responses they serve from cache.
What to check
Check Age with Cache-Control to understand remaining freshness at the client.
Example
Age: 120References
- Registry
- IANA HTTP Field Name Registry
- Guide
- MDN Age