Here's a worst-case scenario you send it to IE and somewhere along the
line it picks up a Vary header.
IE won't store anything in it's cache with a Vary header - not even
downloaded files. So it downloads the file then deletes it.
You can't save it elsewhere or retrieve it!
http://support.microsoft.com/?kbid=824847
(By the way it exhibits the same behaviour if you send proper no-cache
headers.)
So as far as the server is concerned, your logs are concerned, and
anything else you are concerned that file has been delivered to the
client successfully. As far as the user is concerned you may as well not
have bothered as the browser's eaten the download.
Carl
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