4xx Client Error

HTTP 423 Locked

The resource that is being accessed is locked. This is primarily used in WebDAV when a resource is locked by another user and cannot be modified until the lock is released.

Common Causes

  • WebDAV resource locked by another user
  • File being edited by someone else in a collaborative system
  • Database record locked during a transaction

How to Fix

  1. 1Wait for the current lock holder to release the lock
  2. 2Use the UNLOCK method to release the lock if you own it
  3. 3Check who holds the lock and coordinate with them

Example

HTTP 423 Locked
PUT /files/report.docx HTTP/1.1

→ 423 Locked
→ "Resource is locked by user: alice"

Related Client Error Codes

400

Bad Request

401

Unauthorized

402

Payment Required

403

Forbidden

404

Not Found

405

Method Not Allowed

406

Not Acceptable

407

Proxy Authentication Required

408

Request Timeout

409

Conflict

410

Gone

411

Length Required

412

Precondition Failed

413

Content Too Large

414

URI Too Long

415

Unsupported Media Type

416

Range Not Satisfiable

417

Expectation Failed

418

I'm a Teapot

421

Misdirected Request

422

Unprocessable Content

424

Failed Dependency

425

Too Early

426

Upgrade Required

428

Precondition Required

429

Too Many Requests

431

Request Header Fields Too Large

451

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