409 Conflict response status code indicates a request conflict with current state of the target resource.
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.
|Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content (HTTP/1.1 Semantics and Content)|
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