net481 
namespace Microsoft.AspNet.Hosting
{
    public class WebHostBuilder
    {
        public const string OldServerKey = "server";
    }
}
.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.Hosting , Version=1.0.0.0, PublicKeyToken=adb9793829ddae60

Referencing

Your project needs a package reference to Microsoft.AspNet.Hosting.

Package Microsoft.AspNet.Hosting (1.0.0-rc1-final) net451
Preview This API is contained in a prerelease package.
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API