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i try to make the images in my website read from the cache i try adding http heading like this

but i still get in Yshow that it isn't caching. how can i check if a specific image has expire header?

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My guess is the problem might be that the website needs to set the correct caching headers for this to work. –  Sameer Mar 3 '11 at 16:44
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Use a network sniffer like wireshark or a browser plug in like iehttpheaders (MSIE), liveheaders or Web Developer (Firefox)

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