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hyper/tests
Sean McArthur dc619a8fa0 fix(client): detect connection closes as pool tries to use
Currently, if the remote closes the connection at the same time that the
pool selects it to use for a new request, the connection may actually
hang. This fix will now more allow the keep-alive read to check the
socket even when the `Conn` think it's busy.

If the connection was closed before the request write happened, returns
back an `Error::Cancel`, letting the user know they could safely retry
it.

Closes #1439
2018-02-12 18:16:21 -08:00
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