本文介绍在使用NSURLSession进行后台上传任务时的重要限制：不能使用便捷API，必须采用委托代理API实现。文章解释了这一限制的原因，并提供了苹果官方论坛的参考资料。
IMPORTANT You
can’t use NSURLSession’s convenience APIs, things like -uploadTaskWithRequest:fromFile:completionHandler:,
in a background session. You must use the delegate-based API, for example, -uploadTaskWithRequest:fromFile:.
This makes sense when you think about it; if your app is terminated and then relaunched, there’s no way for the system to reconstitute the state held in a completion handler block.
Refer: https://forums.developer.apple.com/message/27555#27555
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