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Cache invalidation can be used to push new content to a client.
This method functions as an alternative to other methods of displaying new content to connected clients.
Cache invalidation must be carried out through a caching proxy; these requests can impact performance of the caching proxy, causing information to be transferred at a slower rate to clients.
Invalidating multiple representations adds a level of complexity to the application.
Fetches requested content from the application, even if cached content is available.
The content previously stored in the cache is replaced with a new version from the application.
The NULL pointer is a constant with a value of zero defined in several standard libraries, including iostream.
Consider the following program: On most of the operating systems, programs are not permitted to access memory at address 0 because that memory is reserved by the operating system.