HTTP 510 Not Extended (OBSOLETED)

Status code 510 · Class 5xx

HTTP

Not Extended (OBSOLETED)

HTTP request chain from browser through CDN and proxy to the origin server
HTTP errors: find which hop in the request chain failed and read its logs.

What it means

HTTP_510 is a HTTP error code reported by web servers and HTTP clients. Its official message is: “Not Extended (OBSOLETED)”

How to fix HTTP 510 Not Extended (OBSOLETED)

  1. It is (almost certainly) server-side: check the origin application logs and error tracker
  2. Test origin directly (bypass CDN/proxy) to separate infra from application errors
  3. If behind a CDN: purge the cache and verify the origin's health status

Related errors

HTTP 504 Gateway TimeoutHTTP 503 Service UnavailableHTTP 511 Network Authentication RequiredHTTP 408 Request TimeoutHTTP 409 ConflictHTTP 410 GoneHTTP 413 Content Too LargeHTTP 422 Unprocessable Content

Source: IANA HTTP Status Code Registry

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