Function: Returns a contextual HTTP error code for authorization failure.

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.

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: Do a REST request.