Variable DRUPAL_METADATA_URL`Const`

DRUPAL_METADATA_URL: "https://packages.drupal.org/files/packages/8/p2/%package%.json" = 'https://packages.drupal.org/files/packages/8/p2/%package%.json'

The v2 metadata endpoint for a package; one GET, and the response is immutable per version.

Routed by vendor: Drupal contrib is not on Packagist, only on drupal.org's own Composer repository, so the whole drupal/ vendor (core included) goes there.