NSURLSession when app goes into background or iOS looses network connectivity -


what happens ephemeral nsurlsession of type data task when app switches foreground or ios looses network connectivity?

in particular, nsurlsessiondelegate notified, or have observe @ level of uiapplicationwillresignactivenotification (as as uiapplicationwillterminatenotification) , kreachabilitychangednotification respectively, if don't want nsurlsession disappear "silently".


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