431
HTTP 431 Request Header Fields Too Large
4xx Client Error
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4xx Client Error
RFC 6585, Section 5
What is HTTP 431 Request Header Fields Too Large?
The 431 (Request Header Fields Too Large) status code indicates that the server is unwilling to process the request because its header fields are too large. This can occur when a cookie is too large or when the cumulative size of all headers exceeds server limits.
Common Use Cases
- Oversized cookies
- Large authentication tokens
- Excessive number of request headers