# Failover: which statuses move to the next provider

status   second tried?  outcome      trail
408      true           answered     [first: failed with status 408, second: ok]
429      true           answered     [first: failed with status 429, second: ok]
500      true           answered     [first: failed with status 500, second: ok]
503      true           answered     [first: failed with status 503, second: ok]
400      false          rethrown     [first: rejected with status 400, not retried]
401      false          rethrown     [first: rejected with status 401, not retried]
404      false          rethrown     [first: rejected with status 404, not retried]

both down: No provider could answer: [a: failed with status 503, b: failed with status 429]