mnot’s Web log: The State of Browser Caching

One of the big problems that Web developers have with HTTP caching is that they don’t know how the caches behave; while the specs say one thing, the actual behaviour of the cache often significantly deviates — usually because the cache’s developer or operator thinks they can do better.

The easiest way to overcome this obstacle is to measure the behaviour of the caches. In particular, thanks to XmlHttpRequest, it’s fairly easy to test a browser’s cache by just hitting a Web site under controlled conditions, in the same manner as discussed earlier.


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