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HTTP_STATUS_CONFLICT
The client might be able to resolve the conflict and resubmit. Common examples include concurrent edits, version mismatches, duplicate names, or state transitions that are no longer valid.
A useful 409 response identifies the conflicting field or current version. Use ETags or revision identifiers for optimistic concurrency instead of retrying the same stale update.
Operational meaning of HTTP 409 for HTTP_STATUS_CONFLICT
HTTP 409 (HTTP_STATUS_CONFLICT) is a client-error response. AllStat records its meaning as “409 Conflict”. For HTTP_STATUS_CONFLICT, interpret it with the request method, selected representation, response headers, and the specification or product that defines the code; the number alone does not prove that application work completed.
Client and server handling for HTTP_STATUS_CONFLICT
- Treat HTTP_STATUS_CONFLICT as a condition visible at the request boundary; inspect authentication, syntax, preconditions, routing, and resource state before retrying.
- For HTTP_STATUS_CONFLICT, preserve the response body and challenge or retry-related headers because they often carry the actionable reason.
- For HTTP_STATUS_CONFLICT, automatic retry is safe only when the method and status contract allow it and the request has been corrected.
For telemetry, record HTTP 409, method, authority, route template rather than secrets, response headers relevant to caching or retry, latency, upstream identity, and whether the response originated at the application or an intermediary.
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