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I've developed a NuGet client that works inside of Unity for some the exact same reasons brought up above:
Doh! I should have guessed I was just looking in the wrong folder.
I can confirm that using System.ServiceModel.dll from...
I've already filed the bug as case #917766
1) Copy System.ServiceModel.Web.dll from [Unity Install Location]\Editor\Data\Mono\lib\mono\2.0 into...
I haven't yet updated it to 2017.1 and its support for .NET 4.x (soon!), but I do have a NuGet package manager that works inside of the Unity...
I'll just leave this here. :-)