4xx Client error responses

431Request Header Fields Too Large

Request header fields too large

#When does this occur?

Returned when request headers (individual or total) exceed the size the server can process. (e.g., too many or too large cookies)

#How to handle?

Reduce request header size. Delete unnecessary cookies or clean up headers.

#Example

HTTP Response

HTTP/1.1 431 Request Header Fields Too Large
Content-Type: application/json
Date: Tue, 10 Feb 2026 07:17:24 GMT

{
  "status": 431,
  "message": "Request Header Fields Too Large"
}

#Related Status Codes

400Bad Request 401Unauthorized 402Payment Required 403Forbidden 404Not Found

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