When you activate a pull zone, KeyCDN will automatically fetch all the static resources from your website. It will cache these resources in various servers around the globe. In order to use these cached resources in your Odoo website, you need to load static resources through the URL given by CDN providers. In step five, we configured this URL for Odoo websites, so that after this step, Odoo will load the static resources CDN URL.
In order to avoid issues for backend users, Odoo loads static resources through CDN URLs for public users only. Once you have logged in, Odoo will stop using CDN URLs and it will load static resources from the same origin.