1.问题：Http请求，返回208, 提示设备空间不足
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2.原因：起初以为是硬盘空间没了，其实不是。实际上是URLSession太多了
参考Stack Overflow:
It appears to get called when there are too many NSURLSessions created, reaching a limit of (in our tests) 600-700 sessions, which are not maintained or closed properly. The error started to get thrown since iOS 14, so it is interesting to see if there was a limit introduced.
3.解决方法：
因为我的网络请求使用的是AFNetworking库，起初是一个请求创建一个 AFHTTPSessionManager的实例，请求多了，自然就会有多个URLSession。
截屏2022-04-19 下午9.33.44.png
