4×× Client Error

412 Precondition Failed

One or more conditions given in the request header fields evaluated to false when tested on the server.

This response code allows the client to place preconditions on the current resource state (its current representations and metadata) and, thus, prevent the request method from being applied if the target resource is in an unexpected state.


412 Code References

Rails HTTP Status Symbol :precondition_failed

Go HTTP Status Constant http.StatusPreconditionFailed

Symfony HTTP Status Constant Response::HTTP_PRECONDITION_FAILED

Python2 HTTP Status Constant httplib.PRECONDITION_FAILED

Python3+ HTTP Status Constant http.client.PRECONDITION_FAILED

Python3.5+ HTTP Status Constant http.HTTPStatus.PRECONDITION_FAILED

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