Is it possible to specify a dynamic base_url

[mozcomp]

We have a multi-domain app, where the base_url will change in line with the url for the request.
How best to specify the base-url for the resources?
Is there an option to specify a Proc?

[mozcomp]

Realised I can set it easily in a controller before_action

[mozcomp]

the issue seems to be with linked resources, you can set the base_url in the controller for the primary resource, but the linked resources retain the base_url of the domain at the time they were initialised.

Ideally it would be something like configuring a global base_url using a Proc