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.

Function: Sends the “Allow” header to state all methods that can be sent to the current route.

Function: Filters the REST API response to include only a white-listed set of response object fields.

Function: Registers a REST API route.

Function: Registers a new field on an existing WordPress object type.

Function: Registers rewrite rules for the REST API.