net481 
namespace System.Web
{
    [TypeForwardedFrom("System.Web.Abstractions, Version=3.5.0.0, Culture=Neutral, PublicKeyToken=31bf3856ad364e35")]
    public abstract class HttpContextBase : IServiceProvider
    {
        public virtual string WebSocketNegotiatedProtocol { get; }
    }
}
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.NET Framework 4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

System.Web , Version=4.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

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