4×× CLIENT ERROR
423 LOCKED
The source or destination resource of a method is locked.
This response SHOULD contain an appropriate precondition or postcondition code, such as ‘lock-token-submitted’ or ‘no-conflicting-lock’.
423 LOCKED Source: RFC4918 Section 11.3
423 CODE REFERENCES
Rails HTTP Status Symbol :locked
Symfony HTTP Status Constant Response::HTTP_LOCKED
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