Each rule can have one action and one condition. Rules are evaluated in priority order, from the lowest value to the highest value. When the condition for a rule is met, the specified action is taken. If no conditions are met, the default action for the default rule is taken. For more information, see Listener Rules in the Application Load Balancers Guide.
To view your current rules, use DescribeRules. To update a rule, use ModifyRule. To set the priorities of your rules, use SetRulePriorities. To delete a rule, use DeleteRule.