HTTP 300 Multiple Choices vs 431 Request Header Fields Too Large
HTTP 300 (Multiple Choices) is a 3xx Redirection response, while 431 (Request Header Fields Too Large) is a 4xx Client Error response. 300 indicates that the request has more than one possible response. The client should choose one of them. In contrast, 431 means that the server refuses to process the request because an individual header field or all headers collectively are too large.
Description
The request has more than one possible response. The client should choose one of them.
When You See It
When a resource is available in multiple formats (e.g., different languages or media types).
How to Fix
Select the appropriate resource variant. Send an Accept header with your preferred content type.
Description
The server refuses to process the request because an individual header field or all headers collectively are too large.
When You See It
When cookies accumulate to an excessive size, or a single header (like Authorization) is too long.
How to Fix
Reduce header sizes. Clear excessive cookies. Use shorter tokens.
Key Differences
300 is a 3xx Redirection response, while 431 is a 4xx Client Error response.
HTTP 300: The request has more than one possible response. The client should choose one of them.
HTTP 431: The server refuses to process the request because an individual header field or all headers collectively are too large.
You encounter 300 when when a resource is available in multiple formats (e.g., different languages or media types).
You encounter 431 when when cookies accumulate to an excessive size, or a single header (like Authorization) is too long.
When to Use Which
For 300 (Multiple Choices): Select the appropriate resource variant. Send an Accept header with your preferred content type. For 431 (Request Header Fields Too Large): Reduce header sizes. Clear excessive cookies. Use shorter tokens.