Invalidating a cache
The protocol needs to do the right thing for either of these possibilities.It is expected to be smart enough to dis-entangle all such race conditions.This has to happen over a network of interconnects.Now, during this transient phase (the time between when invalidations are sent out but not yet received), if another client B requests a read or a write access, the results are completely dependent upon whose request reaches the server (the directory) first.
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You can easily test this by changing a file version back and forth between an unused version, and an older used version, and seeing the HTTP 200 and 304 responses respectively. It does a lot of the stuff you are worrying about automatically and it does handle cache invalidation by using differently named css files every time they are modified.To invalidate cache is to remove the cache entries.
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