net481 
namespace Microsoft.AspNet.Authentication
{
    public abstract class AuthenticationHandler<TOptions> : IAuthenticationHandler
        where TOptions, AuthenticationOptions
    {
        protected HttpContext Context { get; }
    }
}
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.NET Framework 4.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

Microsoft.AspNet.Authentication , Version=1.0.0.0, PublicKeyToken=adb9793829ddae60

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Package Microsoft.AspNet.Authentication (1.0.0-rc1-final) net451
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