net481 
namespace System.Web.WebSockets
{
    public abstract class AspNetWebSocketContext : WebSocketContext
    {
        public override IEnumerable<string> SecWebSocketProtocols { 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
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System.Web , Version=4.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

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