A content delivery network (CDN) is a distributed network of servers that can efficiently deliver web content to users. CDNs store cached content on edge servers that are close to end users to minimize latency.
WordPress on Azure App Service has been gaining popularity since it has been made generally available. Read the GA Announcement here: Announcing the General Availability of WordPress on Azure App...
All the newly created Azure Front Door, Azure Front Door (classic) or Azure CDN Standard from Microsoft (classic) resources will block any HTTP request that exhibits domain fronting behavior.