Cache-Control in the Wild: Browser Cache vs CDN Cache (Debug the “why do I still see it?” problem)

You ship a fix, refresh, and it’s gone… but your coworker still sees the bug. This is usually a two-caches problem: - a browser cache (per user) - a shared cache/CDN (for everyone) In this video, we’ll translate Cache-Control into plain language so you can answer: - which cache answered (browser vs CDN) - why it answered (reuse window, revalidation, or stale-while-revalidate) Practical checklist: - log URL + time + status - read Cache-Control (and Age if present) - check validators (ETag / Last-Modified) - watch for CDN hints (If you’ve ever relied on “hard refresh” as a debugging step, this is the mental model that makes it make sense.)