You can access the settings by navigating to Web Filter > Policeis > Allowed Referrers
If users access an allowed website that incorporates content from blocked websites, the content from those websites will be blocked.
Example: southernacademy.org, Southern Academy’s website, has pages that its teachers use for instruction. If the southernacademy.org page embeds a video from vimeo.com and vimeo.com is blocked, adding an allowed referrer of southernacademy.org will allow the Vimeo videos to play on southernacademy.org but continue to be blocked when a user attempts to access the Vimeo video on vimeo.com.
Use the Allowed Referrers page to create lists of domains that can load content from websites that are normally blocked.
Note: This feature is only available for the inline Web Filter. It is not currently supported for mobile or proxy clients.