HTTP Status Code 510 refers to Not Extended. It indicates that further extensions to the request are required for the server to fulfill it. This status code is used when the server requires additional information or extensions that were not provided in the initial request.
The use of HTTP Status Code 510 is rare and is generally related to specific server configurations or extensions that define additional requirements beyond standard HTTP functionality. It serves as a signal to clients that they need to include more information or modify their requests in order to successfully interact with the server.