Age

Seconds the response has spent in a shared cache.

Response header (sent by servers) caching

How it works

A non-zero Age means a CDN or proxy served a cached copy.

Example

Age: 42

See it live: send any request in Endpoint Client and open the Headers tab, where every response header is explained. Specification: RFC 9111.

Related headers

Cache-Control

Caching rules for browsers, proxies and CDNs.

Expires

Absolute time after which the response is stale.

Vary

Request headers that change the response.