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.
説明
The request succeeded and a new resource was created. Typically returned after POST or PUT requests that create a new entity.
このコードが表示される場合
After successfully creating a new user, post, order, or other resource via a REST API.
解決方法
No fix needed. Check the Location header for the URL of the new resource.
説明
One or more conditions in the request headers (If-Match, If-Unmodified-Since) evaluated to false.
このコードが表示される場合
When using conditional requests with ETags and the resource has changed.
解決方法
Refresh the ETag/Last-Modified value and retry with updated preconditions.
主な違い
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.
どちらをいつ使うか
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.