registry.getPaginatedJSON(url, &response) in registry.repositories uses
a URL including protocol, and base URL at the fist call and fetches the list of repositories correctly.
e.g. url = https://myrepository/v2/_catalog

BUT it returns the URL to fetch the next page without the base URL
e.g. /v2/_catalog?last=something&n=100&orderby=

next call to registry.getPaginatedJSON(url, &response) return an error: unsupported protocol scheme ""

I guess the same error will happen for Tags (registry.repositories)