webview2でPOST送信

vb.netコード

    Dim request = webView2.CoreWebView2.Environment.CreateWebResourceRequest(
            uri:="https://hoge.com/hoge.html",
            Method:="POST",
            postData:=New System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes("test1=data1&test2=data2")),
            Headers:="Content-Type: application/x-www-form-urlencoded " & vbCrLf)
 
    webView2.CoreWebView2.NavigateWithWebResourceRequest(request)