使用异步通信层发出的网络请求流过网络执行器。

Network requests issued by using the asynchronous communication layer flow through a network executor.

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无法将它实例化，而必须通过实现网络执行器从该类进行派生。

You cannot instantiate it; instead, you must derive from it by implementing a network executor.

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如果请求还没有执行器，它将创建默认网络执行器类的实例，并设置请求对象的执行器实例。

If the request does not already have an executor, it creates an instance of the default network executor class and sets the executor instance of the request object.

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