On send, route is still processed; error in BeforeRouting sends exception text

Form1.vb

Public Class Form1
    Dim svr As Grapevine.Server.RestServer
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        svr = New Grapevine.Server.RestServer
        With svr
            .Port = 80
            .Host = "0.0.0.0"
            .UseHttps = False
            AddHandler svr.Router.BeforeRouting, AddressOf BeforeRouting
            .LogToConsole.Start()
        End With
    End Sub

    Private Sub BeforeRouting(ByVal Context As Grapevine.Interfaces.Server.HttpContext)
        Dim Serializer As New System.Web.Script.Serialization.JavaScriptSerializer
        Dim Value As Object = Serializer.DeserializeObject(Context.Request.Payload)

        Try
            Integer.Parse(Value("Value"))
        Catch ex As Exception
            Context.Response.SendResponse(System.Text.ASCIIEncoding.ASCII.GetBytes("401"))
        End Try
    End Sub

    <Grapevine.Server.Attributes.RestResource>
    Public Class RestRoutes
        <Grapevine.Server.Attributes.RestRoute(HttpMethod:=Grapevine.Shared.HttpMethod.POST, PathInfo:="/TEST")>
        Public Function TestRoute(ByVal Context As Grapevine.Interfaces.Server.IHttpContext) As Grapevine.Interfaces.Server.IHttpContext
            Context.Response.SendResponse(System.Text.ASCIIEncoding.ASCII.GetBytes("200"))

            Return Context
        End Function
    End Class
End Class