HTTP 202 Accepted vs 412 Precondition Failed
HTTP 202 (Accepted) is a 2xx Success response, while 412 (Precondition Failed) is a 4xx Client Error response. 202 indicates that the request has been accepted for processing, but the processing has not been completed. The request might or might not eventually be acted upon. In contrast, 412 means that one or more conditions in the request headers (If-Match, If-Unmodified-Since) evaluated to false.
الوصف
The request has been accepted for processing, but the processing has not been completed. The request might or might not eventually be acted upon.
متى تراه
For async operations like batch jobs, email sending, or background tasks that take time to complete.
كيفية الإصلاح
Poll the provided status URL or wait for a callback/webhook.
الوصف
One or more conditions in the request headers (If-Match, If-Unmodified-Since) evaluated to false.
متى تراه
When using conditional requests with ETags and the resource has changed.
كيفية الإصلاح
Refresh the ETag/Last-Modified value and retry with updated preconditions.
الفروق الرئيسية
202 is a 2xx Success response, while 412 is a 4xx Client Error response.
HTTP 202: The request has been accepted for processing, but the processing has not been completed. The request might or might not eventually be acted upon.
HTTP 412: One or more conditions in the request headers (If-Match, If-Unmodified-Since) evaluated to false.
You encounter 202 when for async operations like batch jobs, email sending, or background tasks that take time to complete.
You encounter 412 when when using conditional requests with ETags and the resource has changed.
متى تستخدم أيًا منهما
For 202 (Accepted): Poll the provided status URL or wait for a callback/webhook. For 412 (Precondition Failed): Refresh the ETag/Last-Modified value and retry with updated preconditions.