The HTTP 409 Conflict response status code indicates a request conflict with current state of the server.
Conflicts are most likely to occur in response to a PUT request. For example, you may get a 409 response when uploading a file which is older than the one already on the server resulting in a version control conflict.
409 Conflict
| Specification | Title |
|---|---|
| RFC 7231, section 6.5.8: 409 Conflict | Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content |
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/409