DelegatingHandler using the default HttpMessageHandler

Is there any way to implement a https://msdn.microsoft.com/en-us/library/system.net.http.delegatinghandler(v=vs.118).aspx which uses the default HttpMessageHandler?

I mean when implementing a DelegatingHandler it is necessary to set the InnerHandler, but I can't find a way to implement it in a way so it takes the configuration set in my iOS project "NSUrlSession".