When an HTTP request is legitimate but the server’s current state prohibits it from being performed, the HTTP status code 409 Conflict response is used.
A conflict with the existing state of the target resource prevented the request from being completed. In cases where the user may be able to resolve the problem and retry the request, this code is used.
The server SHOULD provide a payload with enough information for a user to identify the conflict’s source.
Conflicts are most likely to arise when a PUT request is made. If versioning is utilized and the PUT representation includes modifications to a resource that contradicts those made by an earlier (third-party) request, the origin server may respond with a 409 to signal that it is unable to finish the request. The answer representation in this situation would most likely contain information useful for merging the discrepancies depending on the revision history.
409 Code References
Rails HTTP Status Symbol
Go HTTP Status Constant
Symfony HTTP Status Constant
Python2 HTTP Status Constant
Python3+ HTTP Status Constant
Python3.5+ HTTP Status Constant
Why does status code 409 conflict error occurs?
When an HTTP request is legitimate but the server’s current state prohibits it from being performed, the HTTP status code 409 Conflict occurs.
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