Cache-Control on individual images

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shiznatix
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Cache-Control on individual images

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How is it possible to set the cache control header for individual images and css files and javascript files? Some of these are hosted externally too (not on the same server at all). I have not been able to find anything on individual files, expecially things like images, for setting the cache control. I have only found stuff on how to set it for the entire page. Is this even possible?
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