HTTP 431 Request Header Fields Too Large
4xx – Client error
| Status code | 431 |
|---|---|
| Reason phrase | Request Header Fields Too Large |
| Class | 4xx – Client error |
| Reference | RFC 6585 |
Frequently asked questions
What does HTTP status 431 mean?
The request headers are too large, often because of too many or too large cookies.
Is 431 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 431 defined?
Status code 431 is specified in RFC 6585.