This behavior limits allowed requests to a set of domains you specify.

Features and options

Field	What it does	Sub-options
Enable	Enables or disables the referer checking behavior.
Include Child Domains	Includes child domains among the allowed referrers. For example, if the Domain is `example.com`, referrers that have a domain names that match the `.example.com` pattern (like `site1.example.com` or `www.example.com`) are allowed. This is equivalent to prefixing each item in Domain with `.`.	Yes No
Strict Referrer Checking	When enabled, excludes requests whose `Referer` header include a relative path, or that are missing a `Referer`. When disabled, only excludes requests whose referer hostname is not part of the domains set.	On Off
Domain	Specifies the set of allowed domains. With Include Child Domains disabled, prefixing values with `*.` specifies domains for which subdomains are allowed.