Custom rules
Use load balancing rules to customize the behavior of your load balancer. For example, create a rule that selects an origin pool based on the URI path of an HTTP request.
More details
You can create Load Balancing rules whenever you create or edit a load balancer in Traffic > Load Balancing.
As with firewall rules, each Load Balancing rule is a combination of two elements: an expression and an action. Expressions define the criteria for an HTTP request to trigger an action. The action tells Cloudflare how to handle the request.
When building expressions for Load Balancing rules, refer to Supported fields and operators for definitions and usage.
Availability
By default, non-Enterprise customers have one Load Balancing rule per load balancer hostname. For more rules, upgrade to Enterprise.
Limitations
At the moment, you cannot use load balancing rules with Cloudflare Spectrum.