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There are two problems.
1) 200-299 are all good, not just 200
2) Setting the code in addinfourl needs to use the
   2xx code that came from the server

I have a complex http app that broken without this fix.
I'm doing partial transfers that return 206 that was being
overwritten.

This is clearly a bug. The only issue is does the patch fix
the bug and not cause other problems? In nearly a year of
running with this patch on 700 systems I've not seen a
problem.