HTTP 401 Unauthorized
4xx – Client error
| Status code | 401 |
|---|---|
| Reason phrase | Unauthorized |
| Class | 4xx – Client error |
| Reference | RFC 9110 |
Frequently asked questions
What does HTTP status 401 mean?
Authentication is required for the resource, or the credentials are wrong.
Is 401 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 401 defined?
Status code 401 is specified in RFC 9110.