HTTP 201 Created vs 502 Bad Gateway
HTTP 201 (Created) is a 2xx Success response, while 502 (Bad Gateway) is a 5xx Server 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, 502 means that the server, acting as a gateway or proxy, received an invalid response from the upstream server.
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 server, acting as a gateway or proxy, received an invalid response from the upstream server.
このコードが表示される場合
When Nginx/Apache can't reach the application server (e.g., Gunicorn is down, upstream timeout).
解決方法
Check if the upstream server is running. Verify proxy configuration. Check for upstream timeouts.
主な違い
201 is a 2xx Success response, while 502 is a 5xx Server 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 502: The server, acting as a gateway or proxy, received an invalid response from the upstream server.
You encounter 201 when after successfully creating a new user, post, order, or other resource via a REST API.
You encounter 502 when when Nginx/Apache can't reach the application server (e.g., Gunicorn is down, upstream timeout).
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 502 (Bad Gateway): Check if the upstream server is running. Verify proxy configuration. Check for upstream timeouts.