GitLab pages project name as path? (

When using GitLab pages to host a project website, is it possible to have it’s url be something like ?

When trying to add that as a domain (using “New Domain” in the pages settings page), it says you can’t use / as a character.

Or is it only possible to add them as a subdomain in your dns? ( for instance).

Note: I asked this same question on Stackoverflow but got no response there: