wp-includes/rest-api/class-wp-rest-server.php:1360Retrieves the site index.
$requestWP_REST_RequestWP_REST_ResponseOne hook fires while WP_REST_Server::get_index() runs, in this order:
public function get_index( $request ) { // General site data. $available = array( 'name' => get_option( 'blogname' ), 'description' => get_option( 'blogdescription' ), 'url' => get_option( 'siteurl' ), 'home' => home_url(), 'gmt_offset' => get_option( 'gmt_offset' ), 'timezone_string' => get_option( 'timezone_string' ), 'page_for_posts' => (int) get_option( 'page_for_posts' ), 'page_on_front' => (int) get_option( 'page_on_front' ), 'show_on_front' => get_option( 'show_on_front' ), 'namespaces' => array_keys( $this->namespaces ), 'authentication' => array(), 'routes' => $this->get_data_for_routes( $this->get_routes(), $request['context'] ), ); $response = new WP_REST_Response( $available ); $fields = $request['_fields'] ?? ''; $fields = wp_parse_list( $fields ); if ( empty( $fields ) ) { $fields[] = '_links'; } if ( $request->has_param( '_embed' ) ) { $fields[] = '_embedded'; } if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) { $response->add_link( 'help', 'https://developer.wordpress.org/rest-api/' ); $this->add_active_theme_link_to_index( $response ); $this->add_site_logo_to_index( $response ); $this->add_site_icon_to_index( $response ); } else { if ( rest_is_field_included( 'site_logo', $fields ) ) { $this->add_site_logo_to_index( $response ); } if ( rest_is_field_included( 'site_icon', $fields ) || rest_is_field_included( 'site_icon_url', $fields ) ) { $this->add_site_icon_to_index( $response ); } } /** * Filters the REST API root index data. * * This contains the data describing the API. This includes information * about supported authentication schemes, supported namespaces, routes * available on the API, and a small amount of data about the site. * * @since 4.4.0 * @since 6.0.0 Added `$request` parameter. * * @param WP_REST_Response $response Response data. * @param WP_REST_Request $request Request data. */ return apply_filters( 'rest_index', $response, $request ); }Introduced in 4.4.0. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$request retyped from array to WP_REST_Request.verified against sourcesrc/wp-includes/rest-api/class-wp-rest-server.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.