Errors from http-fetch

I've now started getting errors from http-fetch; my guess for the output is that it has problems if an object is not available loose, and is only available in a pack file which is already being downloaded for a different object, possibly only if the first request to be made for the loose object is not the first one to fail.

On the other hand, it looks like just trying again works fine (or, at least, makes progress), so there's no need to fall back to rsync or such.

But that also means that, in order to try to make a repeatable test, you need to copy your state before you run it and get the error; I'll probably try this evening to work it out.

	-Daniel
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