HTTP 201 Created vs 304 Not Modified
HTTP 201 (Created) is a 2xx Success response, while 304 (Not Modified) is a 3xx Redirection 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, 304 means that the resource has not been modified since the last request. The client can use its cached copy.
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
The resource has not been modified since the last request. The client can use its cached copy.
このコードが表示される場合
When the browser cache is still valid (If-None-Match / If-Modified-Since headers match).
解決方法
No fix needed. This saves bandwidth by confirming the cached version is still current.
主な違い
201 is a 2xx Success response, while 304 is a 3xx Redirection 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 304: The resource has not been modified since the last request. The client can use its cached copy.
You encounter 201 when after successfully creating a new user, post, order, or other resource via a REST API.
You encounter 304 when when the browser cache is still valid (If-None-Match / If-Modified-Since headers match).
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 304 (Not Modified): No fix needed. This saves bandwidth by confirming the cached version is still current.