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HTTP_STATUS_RETRY_WITH
Some Microsoft products historically used 449 for a request that needs additional client action, but HTTP does not define interoperable semantics for this number. The response body and vendor documentation are authoritative.
Do not implement a generic automatic retry. Record the emitting server, headers, and payload, then identify the application-specific instruction before changing authentication, request data, or client behavior.
Older Microsoft software has used 449 for a “retry with” style condition, but that does not make the number portable. When it appears, inspect the response body and the generating product before changing the request. Other implementations are free to assign different semantics because 449 is not registered as a standard status.
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