Cloning with a deploy token over HTTP doesn't work
According to the documentation, deploy tokens have been introduced in GitLab 10.7. In terms of Heptapod versions, the feature is new in 0.12.0
Unfortunately, all attempts to clone a Mercurial repository with them end up in 404. As an indication that the authentication part does work, we get a 403 if we make a mistake in the token value.