Ticket #45753: 45753.1.diff

src/wp-includes/rest-api.php

@@ -616 +616 @@
         $data     = [];
 
         foreach ( $handler->get_routes() as $route => $endpoints ) {
-                $match = preg_match( '@^' . $route . '$@i', $request->get_route() );
+                $match = preg_match( '@^' . $route . '$@i', $request->get_route(), $matches );
 
                 if ( ! $match ) {
                         continue;
                 }
 
+                $args = [];
+                foreach ( $matches as $param => $value ) {
+                        if ( ! is_int( $param ) ) {
+                                $args[ $param ] = $value;
+                        }
+                }
+
+                foreach ( $endpoints as $endpoint ) {
+                        // Remove the redundant preg_match argument.
+                        unset( $args[0] );
+
+                        $request->set_url_params( $args );
+                        $request->set_attributes( $endpoint );
+                }
+
                 $data = $handler->get_data_for_route( $route, $endpoints, 'help' );
                 $response->set_matched_route( $route );
                 break;
         }
 
-        $response->set_data( $data );
-
         $response = rest_send_allow_header( $response, $handler, $request );
 
+        $response->set_data( $data );
+
         return $response;
 }