HTTP 204 No Content vs 501 Not Implemented
HTTP 204 (No Content) is a 2xx Success response, while 501 (Not Implemented) 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, 501 means that the server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
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 does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
このコードが表示される場合
When using an HTTP method (like PATCH) that the server doesn't support.
解決方法
Use a different HTTP method that the server supports. Check server documentation.
主な違い
204 is a 2xx Success response, while 501 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 501: The server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
You encounter 204 when after DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
You encounter 501 when when using an HTTP method (like PATCH) that the server doesn't support.
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 501 (Not Implemented): Use a different HTTP method that the server supports. Check server documentation.