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When the CLR creates an input / output stream, when I call BeginXXX ()

Suppose I call the HttpWebRequest.BeginGetRequestStream () method.

I know that this method is asynchronous, and when it ends, you should call the callback method.

I am sure that when calling the callback method, the input / output stream creates the CLR, and this input / output stream makes the callback.

What I'm not sure when I call HttpWebRequest.BeginGetRequestStream (), is there any input / output stream generated by the CLR? Or just a workflow created to send a request to a device?

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