Lesson 07 · 11 min
Caching: Cache-Control and ETag
The fastest request is the one that never happened. The server says how long a response may be kept.
The Cache-Control header in a response tells the browser and intermediate caches (CDNs) what to do with it. max-age=3600 — use the cache for an hour without asking the server. no-store — don't store it at all. no-cache — you may store it, but recheck with the server before using it. private — only in the user's browser, public — in a CDN too.
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