422 => 'Unprocessable Entity',
423 => 'Locked',
424 => 'Failed Dependency',
+ 428 => 'Precondition Required',
+ 429 => 'Too Many Requests',
+ 431 => 'Request Header Fields Too Large',
500 => 'Internal Server Error',
501 => 'Not Implemented',
502 => 'Bad Gateway',
503 => 'Service Unavailable',
504 => 'Gateway Timeout',
505 => 'HTTP Version Not Supported',
- 507 => 'Insufficient Storage'
+ 507 => 'Insufficient Storage',
+ 511 => 'Network Authentication Required',
);
return isset( $statusMessage[$code] ) ? $statusMessage[$code] : null;
}