Having trouble with Forms WebView on Mac with http connection

Hi,

I trying to use a webview on Mac + Forms (not xamarin.mac), but I can't manage to use http connection (for dev) as documented.
It work perfectly fine when I do the build thing for iOS (same code)

Here is what I tried settings the info.plist as describe here :
https://forums.xamarin.com/discussion/52719/xamarin-forms-webview-not-loading-url or /docs.microsoft.com/en-us/xamarin/ios/app-fundamentals/ats

here is my code

namespace MyWebviewApp

open Xamarin.Forms

type App() =
    inherit Application()

    let stack = StackLayout(Orientation = StackOrientation.Vertical, VerticalOptions = LayoutOptions.StartAndExpand)
    let label = Label(XAlign = TextAlignment.Center, Text = "Refresh")

    let webviewSource = UrlWebViewSource(Url = "http://mysite.net") // address to localhost
    let webview = WebView(
                    Source = webviewSource, 
                    VerticalOptions = LayoutOptions.FillAndExpand, 
                    HorizontalOptions = LayoutOptions.FillAndExpand, 
                    WidthRequest = 1000.0, 
                    HeightRequest = 1000.0
    )
    do
        stack.Children.Add(webview)
        stack.Children.Add(label)
        base.MainPage <- ContentPage(Content = stack)

Is there any thing specific for desktop mac and http connection I missed?