About Cloudflare Firewall Rules
Cloudflare Firewall Rules is a flexible and intuitive framework for filtering HTTP requests. It gives you fine-grained control over which requests reach your applications, proactively inspecting incoming site traffic and automatically responding to threats.
In a firewall rule you define an that tells Cloudflare what to look for in a request, and specify the appropriate to take when those conditions are met. Expressions can reference - groups of IP addresses that you can reference collectively by name.