Layer 7 rules

Layer 7 rules define a portion of the incoming traffic that is to be matched with specific values.

If the incoming traffic matches the specified value of a rule, then the rule evaluates to true.
Layer 7 rules are always associated with a Layer 7 policy. Multiple Layer 7 rules can be associated with the same Layer 7 policy.
If multiple rules are associated with a policy, then each rule is evaluated to be true or false.
If all the rules that are associated to a policy evaluate to true, then the policy action is applied to the request. Otherwise, the load balancer evaluates the next policy.

Rules have types, which indicate the portion of the Layer 7 traffic to be matched with the rule.

Rule types
Type	Field to be extracted and evaluated
`HOST_NAME`	The hostname part of the URL (for example, `api.my_company.com`)
`FILE_TYPE`	The end of the URL, representing the file type (for example, `jpg`)
HEADER	A field in the HTTP header
COOKIE	A named cookie in the HTTP header
PATH	The part of the URL that follows the hostname (for example, `/index.html`)

Rules also have a comparison type, which indicates how they are to be evaluated. Rules can have following comparison types:

Rule comparison types
Comparison Type	Type of evaluation
`REGEX`	Match the extracted field (for example, `hostname`) with the supplied regular expression
`STARTS_WITH`	Verify whether the extracted field starts with the supplied string
`ENDS_WITH`	Verify whether the extracted field ends with the supplied string
`CONTAINS`	Verify whether the extracted field contains the supplied string
`EQUAL_TO`	Verify whether the extracted field is identical to the supplied string

Not all rule types support all comparison types. For example, if you are using FILE_TYPE, it is best to use comparison types REGEX and ENDS_WITH.

Layer 7 rule properties

Rule properties
Property	Description
Type	Specifies the type of rule. Rule types can be `HOST_NAME`, `FILE_TYPE`, `HEADER`, `COOKIE`, or `PATH`.
Comparison Type	Comparison types are used in association with the rule type, key, and value to define a rule and classify traffic. Comparison types can be: `REGEX`, `STARTS_WITH`, `ENDS_WITH`, `CONTAINS`, and `EQUAL_TO`.
Key	The description key for the rule types `HEADER` and `COOKIE`.
Value	For the rule types `HEADER` and `COOKIE`, the value is compared against the key.
Invert	If you set the value to 1, the value of this L7 rule comparison is set to `true` whenever the specified rule is not matched.
Layer 7 Policy ID	The unique identifier of the policy to which the rules are attached.