From SonicOS 6.5.1 and later, you can configure the firewall as a web proxy server to control web service, such as preventing users from signing in to some web services using any accounts other than the accounts provided, or restricting the content viewable by users. The web proxy server adds a custom header to all traffic matched by the Content Filtering policy, and the header identifies the domains whose users can access the web services or the content that users can access. Encrypted HTTPS traffic is supported if DPI-SSL is enabled.
Before configuring the Custom Header, make sure that:
To configure a CFS custom header and enable custom header insertion
Do one of the following:
Add a new Security Action Profile.
Edit an existing Security Action Profile.
Hover over an existing Security Action Profile and click the Edit icon.
Select a Content Filter Action.
The content filter action is applied to your security rule using the profile that has the action set to CFS.
Scroll to the Custom Header tab.
Click the Add icon to configure the Domain, Key, and Value for the custom Dynamic Header entry.
Click Save.
The Header appears in the Custom Header list.