Option 1:
Step 1: Create a new CPL proxy layer
<proxy>
exception.format(default)
Option 2:
Step 1: Define your new exception page in any of the local policy files (local/central). This is the one you want the local ProxySG appliance to display in replacement of your cloud exception page.
define string custom-exception-page
><html>
>Your custom exception page
></html>
end
Be advised: Each new line in your HTML document must start with >.
Step 2: Reference your new exception page in any CPL you write. For example:
<proxy>
url.domain=blocked-domain.com exception.format(exception-page) DENY