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Re:The most important thing to understand about queues (2016) by bmm6o on Tuesday March 08, 2022 @07:24PM (#30609378)
I think 429 is the preferred status code for this. Of course you can use whatever you want, but 503 can presumably come up in other scenarios and it's nice to have something unambiguous.
Re:The most important thing to understand about queues (2016) by cjg on Friday March 11, 2022 @04:52AM (#30638111)
429 is only applicable if it's the same user sending all the traffic.

503 explicitly mentions server overload.