HTTP 428 Precondition Required
4xx – Client error
| Status code | 428 |
|---|---|
| Reason phrase | Precondition Required |
| Class | 4xx – Client error |
| Reference | RFC 6585 |
Frequently asked questions
What does HTTP status 428 mean?
The server requires a conditional request (e.g. with If-Match) to avoid lost updates.
Is 428 an error?
Yes, a client error (4xx): the problem lies in the request – for example a wrong URL, missing authentication or invalid data.
Where is HTTP 428 defined?
Status code 428 is specified in RFC 6585.