net481 
namespace System.ServiceModel.Web
{
    public class IncomingWebRequestContext
    {
        public DateTime? IfUnmodifiedSince { get; }
    }
}
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.NET Framework 4.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

System.ServiceModel.Web , Version=4.0.0.0, PublicKeyToken=31bf3856ad364e35

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Your project needs an assembly reference to System.ServiceModel.Web.

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