George Herbert wrote:
I have a Wikipedia OTRS ticket related to someone who keeps getting "Download this file" dialogs when they go to Wikipedia pages...
There's a whole bunch of similar reports at https://bugzilla.wikimedia.org/show_bug.cgi?id=7098. Looks like a Squid bug.
If the cached version of a page is invalid, like not having the Content-Encoding header even though the content is gzipped, then that's the message people get. I've seen it a couple of times too, most often when loading my watchlist, but it's obviously more common for unregistered users since they get cached versions of articles and a single invalid version lives on.
It happens regardless of the browser or its configuration, so I don't think there's any more information users can provide about the problem, unless there's a configuration that manages to get the invalid version there in the first place. When an unregistered user gets it, it can be reproduced elsewhere until the page is purged, but other than the squid server number and missing encoding header, there's not much information there. By the time someone could look at an individual case from the squids, it'll be purged.
It's probably also not as common as some people emailing Wikipedia make it seem to be. They get it repeatedly from the same page because the invalid version is still in their cache. Giving a slightly different url to access the page may often be easier than trying to explain how to clear the remote and local cache.