net481 
namespace System.Net.Http
{
    [EditorBrowsable(EditorBrowsableState.Never)]
    public static class HttpContentExtensions
    {
        public static bool IsJson(this HttpContent content);
    }
}
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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

Microsoft.AspNet.WebHooks.Common , Version=1.2.2.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to Microsoft.AspNet.WebHooks.Common.

Package Microsoft.AspNet.WebHooks.Common (1.2.2) net45
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