If an NSURLProtocol derived class registers to handle http, then if the app is running in the background (using didBeginBackgroundTaskWithExpirationHandler, or a voip/location background mode), then will it be aware of any http traffic from other apps?If an NSURLProtocol derived class registers to
阅读背景：
如果自定义NSURLProtocol在后台运行，它是否可以拦截来自其他应用的流量？
来源：互联网
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