Turns out that the main problem here (cached contents not being served up) is specific to udebs, and other content gets served up OK. There's a patch to that problem in #527188. However, I'm still not sure that giving a 304 if curl craps out is really the right answer here; I think it would be better to hand up a 50x to make it obvious that it's a server *problem*, rather than just some attempt at cache cleverness.
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