HTTP status
HTTP 431 Request Header Fields Too Large
- 431 Request Header Fields Too Large
- Client error
- RFC 6585
HTTP 431 Request Header Fields Too Large is a client error response: the headers are too large to process. It is defined in RFC 6585, and the request was malformed or cannot be fulfilled as sent.
What it means
Status code431
Reason phraseRequest Header Fields Too Largeadvisory only; clients must not depend on the wording
Class4xx Client error
MeaningThe headers are too large to process
Defined inRFC 6585
Cacheable by defaultNoonly cacheable if the response says so explicitly
How clients behave
Indicates an errorYes
Whose faultThe request
Body expectedUsually
Safe to retry automaticallyNo
The 4xx class
Class meaningThe request was malformed or cannot be fulfilled as sent
Codes in this class29
Lowest in class400
Highest in class451
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