Previously, whenever we opened Phabricator through HTTP (e.g. http://phabricator.company.tld) it would redirect us to the glorious safe haven of HTTPS (e.g. https://phabricator.company.tld).

Now however, Phabricator refuses to lead us to the shiny gates of TLS with the following error:

[Rendering Exception/Exception] Refusing to redirect to local resource "https://phabricator.company.tld/".
The URI has a domain, but the redirect is not marked external. Mark redirects as external to allow redirection off the local domain.

Suggested fix: whitelist redirects to the phabricator.base-uri setting.