Grokking Concurrency in Go
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Cancellation Causes and AfterFunc

The program below cancels two searches for two very different reasons. The first is canceled because the client closed its connection. The second is canceled because one of its pages failed to parse, which made the rest of the work pointless. A log line written for each search should say which one happened.

Output:

WithCancel:       context canceled | context canceled
WithCancelCause:  context canceled | context canceled
Cause:            client closed the connection | page b could not be parsed

Err gives the same answer for both searches, and it must

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