wp-includes/rest-api.php:1430Returns a contextual HTTP error code for authorization failure.
intfunction rest_authorization_required_code() { return is_user_logged_in() ? 403 : 401;}Introduced in 4.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.