http 412 Precondition Failed

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.

• Source: RFC7232 Section 4.2

412 Code References

Rails HTTP Status Symbol recondition_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