- backdrop_bootstrap in includes/
bootstrap.inc - Ensures Backdrop is bootstrapped to the specified phase.
- drupal.inc in includes/
drupal.inc - Contains constants and function wrappers for Drupal 7.x compatibility.
- http.php in modules/
simpletest/ tests/ http.php - Fake an HTTP request, for use during testing.
- https.php in modules/
simpletest/ tests/ https.php - Fake an HTTPS request, for use during testing.
- install_begin_request in includes/
install.core.inc - Begins an installation request, modifying the installation state as needed.
- update_prepare_bootstrap in includes/
update.inc - Performs extra steps required to bootstrap when using a Drupal 7 database.