HTTP 201 Created vs 428 Precondition Required
HTTP 201 (Created) is a 2xx Success response, while 428 (Precondition Required) 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, 428 means that the server requires the request to be conditional (e.g., include If-Match header) to prevent lost updates.
Description
The request succeeded and a new resource was created. Typically returned after POST or PUT requests that create a new entity.
Quand vous le voyez
After successfully creating a new user, post, order, or other resource via a REST API.
Comment résoudre
No fix needed. Check the Location header for the URL of the new resource.
Description
The server requires the request to be conditional (e.g., include If-Match header) to prevent lost updates.
Quand vous le voyez
When an API requires optimistic concurrency control via ETags.
Comment résoudre
Fetch the resource first to get its ETag, then include If-Match in your update request.
Différences clés
201 is a 2xx Success response, while 428 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 428: The server requires the request to be conditional (e.g., include If-Match header) to prevent lost updates.
You encounter 201 when after successfully creating a new user, post, order, or other resource via a REST API.
You encounter 428 when when an API requires optimistic concurrency control via ETags.
Quand utiliser lequel
For 201 (Created): No fix needed. Check the Location header for the URL of the new resource. For 428 (Precondition Required): Fetch the resource first to get its ETag, then include If-Match in your update request.