Change record status: 
Project: 
Introduced in branch: 
8.x-3.x
Introduced in version: 
8.x-3.4
Description: 

UI

The UI gained an additional dropdown in the "mapping" vertical tab, to configure the scheme to use:

Configuration

There is a new top-level key in cdn.settings.yml:

# Scheme-relative CDN URLs are generated by default (`//`), but it is possible to generate absolute URLs by setting it
# it to `https://` or `http://`.
scheme: //

Update path

The update path ensures existing sites get the scheme set to // by default. This ensures unchanged behavior (scheme-relative aka protocol-relative CDN URLs).

Impacts: 
Site builders, administrators, editors
Module developers
Site templates, recipes and distribution developers