Referrer is not defined

Matches when the Referer request header does not match any application aliases.

This condition checks if the Referer header sent in the request does not match any of the aliases associated with the application. It returns true if the requester’s referrer hostname is not recognized as an application alias.

Configuration

No further configurations are necessary for this condition. The logic is applied automatically by comparing the request header against the application’s current list of aliases.

Measurement

The condition extracts the hostname from the Referer header of the incoming request. It then performs a lookup against the list of aliases configured for the application and returns true if no match is found. This is commonly used to identify traffic originating from outside the application.


Last modified March 5, 2026