xamarinmac 
namespace System.Web
{
    public class HttpServerUtility
    {
        [EditorBrowsable(EditorBrowsableState.Never)]
        public void TransferRequest(string! path, bool preserveForm, string! method, NameValueCollection! headers, bool preserveUser);
    }
}
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Reference this API
.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to xamarinmac
Assembly

Microsoft.AspNetCore.SystemWebAdapters , Version=2.0.0.0, PublicKeyToken=adb9793829ddae60

Referencing

Your project needs a package reference to Microsoft.AspNetCore.SystemWebAdapters.

Package Microsoft.AspNetCore.SystemWebAdapters (2.0.0) netstandard2.0
Obsolete SYSWEB0001: TransferRequest is not supported on ASP.NET Core
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API