HTTP 204 No Content vs 503 Service Unavailable
HTTP 204 (No Content) is a 2xx Success response, while 503 (Service Unavailable) is a 5xx Server Error response. 204 indicates that the server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body. In contrast, 503 means that the server is temporarily unable to handle the request due to maintenance or overload. Should include a Retry-After header.
説明
The server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
このコードが表示される場合
After DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
解決方法
No fix needed. The action was successful; there is simply no content to return.
説明
The server is temporarily unable to handle the request due to maintenance or overload. Should include a Retry-After header.
このコードが表示される場合
During maintenance windows, server overload, or when the application pool is exhausted.
解決方法
Wait and retry. Check the Retry-After header. Scale up servers if it's a capacity issue.
主な違い
204 is a 2xx Success response, while 503 is a 5xx Server Error response.
HTTP 204: The server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
HTTP 503: The server is temporarily unable to handle the request due to maintenance or overload. Should include a Retry-After header.
You encounter 204 when after DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
You encounter 503 when during maintenance windows, server overload, or when the application pool is exhausted.
どちらをいつ使うか
For 204 (No Content): No fix needed. The action was successful; there is simply no content to return. For 503 (Service Unavailable): Wait and retry. Check the Retry-After header. Scale up servers if it's a capacity issue.