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We have a security proxy at work that gives you the bits, but then holds the connection open while it does a scan, then resets the connection if it doesn't like something inside. Both Chrome and Firefox [haven't tried IE/Edge, but I assume that they'll do something that the proxy vendor would want] infer [or are told?] that the connection broke and delete the interim file. Unfortunately, with zip files, the header is at the end; so it can't do scanning until the whole file is down. For me, the easiest way to mitigate it turned out to be to use wget [with an appropriate user-agent... say, the same as my desktop browser]. wget Gets the bits, but doesn't in any way molest the "partial" download when the connection resets. Then it tries to download the rest using the "Range" HTTP header, and the server says "oh, dude, you already got the whole thing"; wget declares success, and all the bits are in my download folder. I believe that we pay, like, a lot for this proxy, which is annoying on two counts: 1) If I can get past it trivially, then presumably competent attackers can, too, and 2) Sometimes it takes a dislike to legitimate stuff, which is how I was forced to learn how to get around it. |