Phabricator has a feature to watch a repository hosted elsewhere, which is being used here for testing with several repos (e.g. rMW). Several of these use https URLs (e.g. rMW has https://github.com/wikimedia/mediawiki-core, rMMV has https://gerrit.wikimedia.org/r/mediawiki/extensions/MultimediaViewer).
I tried to use https://git.wikimedia.org/git/mediawiki/extensions/GettingStarted.git (which I think is controlled by GitBlit) for GettingStarted. However, it refused to clone it (see rGETTINGSTARTED). I wonder if it's getting confused because of the .git suffix.