CDN providers, such as Cloudflare, are using DNS-based techniques to serve website content. If you want to configure CDN with Cloudflare, you need to configure a few more things. In order to do that, you need to serve a cached website through different domains/subdomains than your website domain. For example, odoo.com uses odoocdn.com to serve CDN resources. After that, you need to set this domain/subdomain as a CDN Base URL in Odoo configuration.
Warning
You need to be extra careful when serving the same website from different URLs, as it might change your sitemap.xml file if you submit this CDN domain for search engine indexing.
You need to be extra careful when serving the same website from different URLs, as it might change your sitemap.xml file if you submit this CDN domain for search engine indexing.