There's "431 Request Header Fields Too Large" which you will see occasionally. But after that 451 is the only other 400-level error code above 429. It was chosen as a reference to the book Fahrenheit 451.
There's "431 Request Header Fields Too Large" which you will see occasionally. But after that 451 is the only other 400-level error code above 429. It was chosen as a reference to the book Fahrenheit 451.