5xx Server error

510 Not Extended

The request needs further extensions to be fulfilled.

What 510 means

From the abandoned HTTP Extension Framework. Essentially unused.

Common causes

An HTTP extension policy wasn't met.

How to fix it

If you're calling an API

Report it to the site owner.

If you run the server

Rarely relevant.

Should you retry?

No.

Example response

HTTP

HTTP/1.1 510 Not Extended
Content-Type: application/problem+json

{
  "type": "about:blank",
  "title": "Not Extended",
  "status": 510,
  "detail": "The request needs further extensions to be fulfilled."
}

Defined in: RFC 2774 (obsolete). 510 is a server error: the problem is on the server's side.

Debugging an API call? Convert your request with the cURL converter, check the response with the JSON formatter, or see whether the API is down on its status page.

HTTP 510 FAQ

What does HTTP 510 mean?

510 Not Extended: The request needs further extensions to be fulfilled. From the abandoned HTTP Extension Framework. Essentially unused.

Is 510 a client or server error?

It's a server error (5xx): the server failed to handle a valid request, so the fix is usually on the server's side.

How do I fix a 510 error?

Report it to the site owner.

Should I retry after a 510?

No.

Other 5xx status codes

All HTTP status codes