510
Not Extended
Server Error
Description
Further extensions to the request are required for the server to fulfill it
Common Usage
Rarely used; server requires extensions not present
Example Response
How this status code appears in HTTP responses
HTTP Response Header
HTTP/1.1 510 Not ExtendedcURL Example
curl -I https://example.com
# Returns: HTTP/1.1 510 Not ExtendedServer Error Response
This is a server error response indicating the server failed to fulfill a valid request.
Related Server Error Codes
Other codes in the same category
500
Internal Server Error
A generic error message when the server encounters an unexpected condition
501
Not Implemented
The server does not support the functionality required to fulfill the request
502
Bad Gateway
The server was acting as a gateway or proxy and received an invalid response from the upstream server