REST API endpoints for sites

src/wp-includes/rest-api.php

@@ -324,6 +324,10 @@ function create_initial_rest_routes() {
 	$controller = new WP_REST_Comments_Controller();
 	$controller->register_routes();
 
+	// Sites.
+	$controller = new WP_REST_Sites_Controller();
+	$controller->register_routes();
+
 	$search_handlers = array(
 		new WP_REST_Post_Search_Handler(),
 		new WP_REST_Term_Search_Handler(),