With the active proxy and the web application server used in combination, in this scenario the X Engine can be configured to act as a proxy that has the ability to add content.
Use cases include:
Customisation of the user experience of a SaaS application, without the knowledge of the SaaS provider
Mobile enablement of an existing application without any changes
Adding two-factor authentication to an existing insecure application
Short lived campaigns and surveys that would otherwise clutter the target application code