dracoblue.net

Cache-Control revalidate

If you want to revalidate the contents of some kind of image, without delivering the entire image, on each call: no-cache-Header won't be the right choice.

You may workaround this issue, by setting:

Cache-Control: max-age=3600, must-revalidate
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@ 30 Sep 2009, Comments at Reddit & Hackernews