lookup> 423

423 ·Locked

The resource is locked and cannot be modified (WebDAV).

Client ErrorRFC5218#10.4

Quick facts

Status423

PhraseLocked

TypeClient Error

SpecificationRFC5218#10.4

When does it occur

What does HTTP 423 mean?

The resource is locked and cannot be modified (WebDAV).

It belongs to the 4xx Client Error class of responses, defined in RFC5218#10.4.

Browse all codes in this class: 4xx Client Error

Common causes

The request or resource does not meet requirements
Client-side validation or routing problem

Frequently asked questions

Is HTTP 423 cacheable?

423 belongs to the 4xx Client Error class and is generally not cached for long; behavior is controlled by Cache-Control.

What does the 4xx class mean?

4xx Client Error: The resource is locked and cannot be modified (WebDAV).

Sources & standards

Updated 2026-08-18

Explore this reference

4xx responses

4xx

Client Error

Related status codes