[iOS] prevent "No Space Left on Device" error when hundreds of request are made #520
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If hundreds of request are made in a short period of time, e.g. syncing huge amount data to device. We run into an "No Space Left on Device" error which seems to come from to many open, not invalidated NSURLSessions.
I looked into the original AFNetworking library code which reverted the change of dispatching the invalidation of session async.
AFNetworking/AFNetworking@2163a8b
Also fixing memory leaks in upload and download file request.