HTTP 400 Bad Request
4xx – Client error
| Status code | 400 |
|---|---|
| Reason phrase | Bad Request |
| Class | 4xx – Client error |
| Reference | RFC 9110 |
Frequently asked questions
What does HTTP status 400 mean?
The server cannot process the request due to a client error, such as malformed syntax.
Is 400 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 400 defined?
Status code 400 is specified in RFC 9110.