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Q2A version: 1.5

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"The caching of images in the end user's browser is unrelated to the way in which the images are stored on the server. When outputting a blob (including an image), Q2A adds an HTTP header to encourage caching at the client end (see qa-blob.php)." quoting gidgreen

see http://www.question2answer.org/qa/13219/upload-images-instead-database-possible-recommended-ckeditor

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you are totally correct. i already seen that header. But images generated from database don't show "304 Not Modified". For other images its working fine.
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It uses the max-age directive, which tells the browser to cache the image for 30 days. In this case no Last Modified value is needed.
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