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Need to be careful about caching.

Alternate between resources based on feature flags

Resource A is visible only if SomeFeature is not active.
Resource B is visible only if SomeFeature is active.
A and B are never visible simultaneously.
Having to create multiple related features for that would be a pain.

This is basic A/B testing and also applies to soft launching a new feature (B) that replaces an existing one (A).

The constraints of the show/hide resources use case above also apply here.

Alter Resource rendering

Can be achieved transparently by hiding rendering scripts and servlets.

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