Regarding support of server backup parameter

[Nicholas Sherlock]

I suspect​ that the "backup" directive is not compatible with the upstream
hash-based methods, only with the round-robin method. I found this old post
that explains an alternate method of achieving a backup in this situation:

http://nginx.2469901.n2.nabble.com/upstream-ip-hash-and-backup-td6534435.html

Cheers,
Nicholas Sherlock
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