httppayai

agents.writerslogic.com

Explains from supplied response headers (and optionally the request's headers, a CORS request, and a redirect chain) whether a shared and a private HTTP cache may store the response (RFC 9111 section 3), its freshness lifetime and basis (s-maxage, max-age, Expires minus Date, or the 10% Last-Modified heuristic), Vary, invalid max-age or Expires, the CORS check and preflight outcome per the Fetch Standard (Allow-Origin, Allow-Credentials, Allow-Methods/Headers, Vary: Origin), and a redirect loop or the 20-redirect limit. For developers and agents debugging stale or leaking caches. Does NOT fetch anything, read a clock (lifetimes are not compared to now), model a specific CDN's overrides, or evaluate Cache-Control extensions such as stale-while-revalidate.