Repeating this experiment now, the nutmeg response produces application/x-tar content-type. I'm relatively confident that there's no proxy between my machine and launchpadlibrarian.net, but I can't 100% rule out my ISP doing something sneaky (as far as I know, they're not known for doing this sort of thing). Note though that the ticket was first filed by zooko, so presumably the two of us both saw this behavior, and we're several thousand miles apart and on different ISPs.
Repeating this experiment now, the nutmeg response produces application/x-tar content-type. I'm relatively confident that there's no proxy between my machine and launchpadlibrar ian.net, but I can't 100% rule out my ISP doing something sneaky (as far as I know, they're not known for doing this sort of thing). Note though that the ticket was first filed by zooko, so presumably the two of us both saw this behavior, and we're several thousand miles apart and on different ISPs.