HTTP 308 Permanent Redirect vs 510 Not Extended
HTTP 308 (Permanent Redirect) is a 3xx Redirection response, while 510 (Not Extended) is a 5xx Server Error response. 308 indicates that the resource has been permanently moved. Like 301, but guarantees the HTTP method will NOT be changed. In contrast, 510 means that further extensions to the request are required for the server to fulfill it.
Description
The resource has been permanently moved. Like 301, but guarantees the HTTP method will NOT be changed.
When You See It
For permanent URL changes where POST requests must remain POST.
How to Fix
Update all references to the new URL. The HTTP method is preserved.
Description
Further extensions to the request are required for the server to fulfill it.
When You See It
When an HTTP extension required by the server is not present in the request.
How to Fix
Add the required extension headers to your request.
Key Differences
308 is a 3xx Redirection response, while 510 is a 5xx Server Error response.
HTTP 308: The resource has been permanently moved. Like 301, but guarantees the HTTP method will NOT be changed.
HTTP 510: Further extensions to the request are required for the server to fulfill it.
You encounter 308 when for permanent URL changes where POST requests must remain POST.
You encounter 510 when when an HTTP extension required by the server is not present in the request.
When to Use Which
For 308 (Permanent Redirect): Update all references to the new URL. The HTTP method is preserved. For 510 (Not Extended): Add the required extension headers to your request.