WP_REST_Server::check_authentication(): WP_Error|null|true

172	public function check_authentication() {173		/**174		 * Filters REST API authentication errors.175		 *176		 * This is used to pass a WP_Error from an authentication method back to177		 * the API.178		 *179		 * Authentication methods should check first if they're being used, as180		 * multiple authentication methods can be enabled on a site (cookies,181		 * HTTP basic auth, OAuth). If the authentication method hooked in is182		 * not actually being attempted, null should be returned to indicate183		 * another authentication method should check instead. Similarly,184		 * callbacks should ensure the value is `null` before checking for185		 * errors.186		 *187		 * A WP_Error instance can be returned if an error occurs, and this should188		 * match the format used by API methods internally (that is, the `status`189		 * data should be used). A callback can return `true` to indicate that190		 * the authentication method was used, and it succeeded.191		 *192		 * @since 4.4.0193		 *194		 * @param WP_Error|null|true $errors WP_Error if authentication error, null if authentication195		 *                                   method wasn't used, true if authentication succeeded.196		 */197		return apply_filters( 'rest_authentication_errors', null );198	}