Canceling asynchronous operations
Sometimes, after an asynchronous operation has been initiated and has not yet completed, the conditions in the application may change so that the initiated operation becomes irrelevant or outdated and nobody is interested in the completion of the operation.
In addition to this, if an initiated asynchronous operation is a reaction to a user command, the user may change their mind while the operation is being executed. The user may want to discard the previous issued command and may want to issue a different one or decide to exit from the application.
Consider a situation where a user types a website address in a typical web browser's address bar and hits the Enter key. The browser immediately initiates a DNS name ...
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