If you are trying to modify headers to work with dynamic
binaries such as videos or images, the new IE 7 appears to
require the ETag header. You will need to make sure that
you follow the specifications for how ETag works in order
for your cache control to work properly. Mozilla supports
the ETag header as well, but does NOT require it for
caching. If you need to cache a dynamic image, video, or
other binary file, and are having trouble in IE7, be sure to
set your ETag and then check for the If-Not-Modified header
on subsequent requests so that you can properly return the
304 Not Modified page. If you do not, then it will NEVER
cache the file (as of IE version 7.0.5730.11
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