HTTP 204 No Content vs 431 Request Header Fields Too Large
HTTP 204 (No Content) is a 2xx Success response, while 431 (Request Header Fields Too Large) is a 4xx Client Error response. 204 indicates that the server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body. 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 server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
When You See It
After DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
How to Fix
No fix needed. The action was successful; there is simply no content to return.
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
204 is a 2xx Success response, while 431 is a 4xx Client Error response.
HTTP 204: The server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
HTTP 431: The server refuses to process the request because an individual header field or all headers collectively are too large.
You encounter 204 when after DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
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 204 (No Content): No fix needed. The action was successful; there is simply no content to return. For 431 (Request Header Fields Too Large): Reduce header sizes. Clear excessive cookies. Use shorter tokens.