I think it would be bad practice to use this keyword on end-point URL&#x27;s that are advertised in search engines or API documentation.<p>You would want to use it for resources to which base pages and manifests point; such as JS, CSS, JPG, PNG, etc.<p>The browser could enforce that, sort of. It could ignore immutable cache status on the object that is actually in the browser location bar and IMS it, but it could allow it on referenced objects.<p>The idea is that referenced objects can simply stop being referenced, and a fresh object is referenced.