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Originally Posted by Chrysalis
mr-b that would explain why I had so many problems on the development pages I used, the first time I downloaded the file probably cached it and because its a large file it is probably cached for a long time, but the file is updated at the server end numerous times a day, the cache made it pretty much unusable for me to use. This was before I setup my own proxy of course.
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Size of file has nothing to do with how long browsers or proxies cache the object for. They cache the object until they run out of allocated disk space and something else replaces it.
Just run your dev server's URL through the Cacheablity Engine
http://www.ircache.net/cgi-bin/cacheability.py and it'll tell you exactly what's going on (Definitely given that link out before).
If the file is being updated frequently then its Last Modified header will be more recent which will tell your browser or proxy to verify its freshness more frequently.