431
Request Header Fields Too Large
Client ErrorThe server refuses the request because its header fields are too large.
Category: 4xx Client Errors Standard: RFC 6585
What is 431 Request Header Fields Too Large?
HTTP 431 Request Header Fields Too Large is a 4xx status code. The server refuses the request because its header fields are too large.
Client Request
Server
Request Rejected
Common Causes
The request was malformed or invalid
The client lacks permission or valid authentication
The requested resource or route does not exist
A precondition or content requirement was not met
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