title: POST-Request in Xamarin WebView?
body: <p>I've a simple Xamarin.Forms page with a WebView in it, working well.
  Now I want to call POST-Requests (sending form-data) for an URL.
  Do I have to create 3 different views for Android, iOS and UWP to achieve that - or is there a way to implement the C# post-request code only once in the shared coded of my Xamarin-Forms project?</p>