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I'd use random data to make it hard to compress. You don't know if there won't be some link layer compression along the way.

That doesn't really fix the problem, what if that random data happened to compress well? The solution is to not compress anything while downloading.

A large quantity of random data is incredibly unlikely to compress well.

"Random data' [1] will not compress well [2].

[1] high-entropy in any of the usually-available ways

[2] for any compression system actually deployed, as opposed to one contrived to match specifically the 'random' source