HttpClient Example

http.cs

var httpClient = new HttpClient();
string text = await httpClient.GetStringAsync("http://chucknorris.com/");

//NOTE: you can't do this, or you will not get an automatic NSUrlSessionHandler
var httpClient = new HttpClient(new HttpClientHandler
{
    //Some settings
});

Hi there, as of Mono 4.8 this is necessarily correct.
You should update your related blog post
http://jonathanpeppers.com/Blog/improving-http-performance-in-xamarin-applications

which by the way is very useful