Tue Dec 12 2017 23:36:15 UTC
If there's anything to blame, it's the lack of unit tests.
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ID Product Comp Assignee Status Resolution Summary Changed
27485 Class Li System.N bugzilla RESO DUPL UnicastAddress.IPv4Mask throws NotImplementedException when coding Xamarin.Forms app from Visual Studio 2013 on Windows 2016-05-25
One bug found.

as

File a new bug in the "System.Net.Http" component of the "Class Libraries" product