HTTP 201 Created vs 412 Precondition Failed
HTTP 201 (Created) is a 2xx Success response, while 412 (Precondition Failed) is a 4xx Client Error response. 201 indicates that the request succeeded and a new resource was created. Typically returned after POST or PUT requests that create a new entity. In contrast, 412 means that one or more conditions in the request headers (If-Match, If-Unmodified-Since) evaluated to false.
설명
The request succeeded and a new resource was created. Typically returned after POST or PUT requests that create a new entity.
이 코드를 보게 되는 경우
After successfully creating a new user, post, order, or other resource via a REST API.
해결 방법
No fix needed. Check the Location header for the URL of the new resource.
설명
One or more conditions in the request headers (If-Match, If-Unmodified-Since) evaluated to false.
이 코드를 보게 되는 경우
When using conditional requests with ETags and the resource has changed.
해결 방법
Refresh the ETag/Last-Modified value and retry with updated preconditions.
주요 차이점
201 is a 2xx Success response, while 412 is a 4xx Client Error response.
HTTP 201: The request succeeded and a new resource was created. Typically returned after POST or PUT requests that create a new entity.
HTTP 412: One or more conditions in the request headers (If-Match, If-Unmodified-Since) evaluated to false.
You encounter 201 when after successfully creating a new user, post, order, or other resource via a REST API.
You encounter 412 when when using conditional requests with ETags and the resource has changed.
언제 어떤 것을 사용할지
For 201 (Created): No fix needed. Check the Location header for the URL of the new resource. For 412 (Precondition Failed): Refresh the ETag/Last-Modified value and retry with updated preconditions.