Getting URL root

I have an app I distribute to clients.

When I run the app on my local machine I connect to http://127.0.0.1/...
When I'm VPN-ed into a client site I connect to the app on their
machine with http://xx.xx.xx.xx/...
When a client is running locally at their site they connect with
http://myappsname.company.com/....

I need to get that initial part of the URL from the python side. Is
there some way to do that? (I may be using the wrong terminology here
when I say 'url root'.)

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