upstream 429 and non-idempotent request

[Frank Liu]

In case of upstream returning 429, I'd like to have nginx retry next
upstream server. Since nginx by default won't retry non-idempotent
requests, how do I force nginx to retry when receiving 429? I imagine this
should be the default behavior anyway, or does nginx not care about
returning code and will never retry non-idempotent?

Thanks!
Frank
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