By default, Cloudflare allows requests on a number of different HTTP ports.
You can target requests based on their HTTP port with the cf.edge.server_port field. Use the in comparison operator to target a set of ports.
This example blocks requests to www.example.com that are not on ports 80 or 443:
- Expression:
(http.host eq "www.example.com" and not cf.edge.server_port in {80 443})
- Action: Block
