Caching best practices & max-age gotchas

What it does

How to get the most out of caching without nasty race conditions

Getting caching right yields huge performance benefits, saves bandwidth, and reduces server costs, but many sites half-arse their caching, creating race conditions resulting in interdependent resources getting out of sync. Page : Hey, I need "/script-v1.js" , "/styles-v1.css" and "/cats-v1.jpg" 10:24 Server : Sure, here you go. Btw Cache: these are fine to use for like, a year. 10:25 Page : Hey, I need "/script- v2 .js" , "/styles- v2 .css" and "/cats-v1.jpg" 08:14 Cache : I've got the cats one, here you go. I don't have the others. Server? 08:14 Server : Sure, here's the new CSS & JS. Btw Cache: these are also fine to use for a year. 08:15 Cache : Hm, I haven't used "/script-v1.js" &…from jakearchibald.com

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