To provide value on the internet, you must piss someone off.
Cha-cha-cha-cha-changes...
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To provide value on the internet, you must piss someone off.
Cha-cha-cha-cha-changes...

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Ryan Tomayko has put together a great presentation outlining the very basics of HTTP caching. The diagrams are perfect, and explain exactly how simple `Cache-Control` headers work, and how they become even more powerful in conjunction with ETags. There's nothing in this presentation that's not in his older essay "[Things Caches Do][tcd]", but it's worth sifting through if you need a refresher. [tcd]: http://tomayko.com/writings/things-caches-do