HTTP 423 Locked is a WebDAV extension (RFC 4918) indicating the source or destination resource is locked. In WebDAV, users lock resources for exclusive editing — other users attempting to modify a locked resource receive 423. The concept extends to any system with pessimistic locking: database records, document editing, configuration management. The response should indicate who holds the lock and when it expires.
Response includes the status code, standard headers (including Content-Type), and a small diagnostic JSON body describing the request and returned status.
Simulator URL (copy in the app after load — not a normal link):
https://httpstatus.com/api/status/423
Example request:
curl -i "https://httpstatus.com/api/status/423"