Function: Sanitize a request argument based on details registered to the route.

Function: Adds the REST API URL to the WP RSD endpoint.

Function: Do a REST request.

Function: Retrieves the current REST server instance.

Function: Ensures request arguments are a request object (for consistency).

Function: Ensures a REST response is a response object (for consistency).

Function: Handles _deprecated_function() errors.

Function: Handles _deprecated_argument() errors.

Function: Sends Cross-Origin Resource Sharing headers with API requests.

Function: Handles OPTIONS requests for the server.