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HTTP Status Codes

HTTP 409 Conflict

409 Conflict

The request conflicts with the current state of the target resource, so the server rejected the update or operation.

409 Conflictconfiguration

Observed message

409 Conflict

Why it happens

  • The request conflicts with the current stored version of the resource.
  • Another client changed the resource state before the request was applied.
  • The operation attempts to create a duplicate or incompatible resource state.

How to fix it

  1. Fetch the latest state of the resource before retrying the change.
  2. Use versioning, etags, or concurrency checks where supported.
  3. Adjust the request so it no longer conflicts with the current resource state.

Official reference

MDN: 409 Conflict

Related errors

405 Method Not AllowedHTTP 405 Method Not Allowed400 Bad RequestHTTP 400 Bad Request401 UnauthorizedHTTP 401 Unauthorized403 ForbiddenHTTP 403 Forbidden

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409 Conflict: what it means and how to fix it | Error Atlas