title: Supporting TLS 1.2 and 1.1 in portable HttpClient
body: <p>Using the HttpClient with Microsoft.Net.Http Nuget package, how can I default to TLS 1.2 or 1.1?</p>
  
  <p>Perhaps complicating things is that I'm using a PCL that's targeting: .NET Framework 4.5, Windows 8, and Windows Phone Silverlight 8 (i.e. Profile78 / targetFramework="portable-net45+win8+wp8").</p>
  
  <p>[Update]</p>
  
  <p>Based on the discussion with Steffen I should clarify: I want to ensure that the portable version of HttpClient will support TLS12 and TLS11 if requested by the server. (Revised the title but left the original question.)</p>