net48 
namespace Microsoft.AspNet.Http.Authentication
{
    public abstract class AuthenticationManager
    {
        public virtual Task ChallengeAsync(string authenticationScheme, AuthenticationProperties properties);
    }
}
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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 net48
Assembly

Microsoft.AspNet.Http.Abstractions , Version=1.0.0.0, PublicKeyToken=adb9793829ddae60

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Package Microsoft.AspNet.Http.Abstractions (1.0.0-rc1-final) net451
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