Core: Mark 502 and 504 statuses as retryable to the REST exponential retry strategy #9885
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Bad gateway or gateway timeouts should be able to be safely retried. A bad gateway could be caused by a load balancer or proxy between the client and the actual server, when there's some network partition between the LB and server. A retry in this case could route the request to another server.
A gateway timeout could occur when the LB/proxy is waiting for a response from the actual server, but it takes too long. in this case a retry could be performed again to increase the chance of hitting a more available server.