Phabricator does have code hosting, and the Phabricator master repository is self-hosted on Phabricator and mirrored to GitHub.
We link to GitHub because they have more infrastructure than we do for handling heavy read loads.
We link to GitHub because they have more infrastructure than we do for handling heavy read loads.
Generally speaking, we proxy requests and pass them through to the VCS after performing authentication and broad permission checks. Requests are rewritten slightly to remap user-facing display paths to actual paths on disk. Some additional features act through commit hooks.