The request has been validated and queued, so it cannot subsequently be rejected
Nothing beyond acceptance for processing; the request might or might not eventually be acted upon✓Правильный ответ
The request will be performed, but the result is not yet available
The request will be performed and the final status code will be delivered on a later connection
Объяснение
The spec calls 202 intentionally noncommittal: the work may be disallowed when processing actually takes place, and there is no facility in HTTP for re-sending a status code from an asynchronous operation. The recommended practice is to return a representation pointing at a status monitor.