GeoffCox

WebRequestHandler handler = new WebRequestHandler()
{                
  UseProxy = true,                                    
};

var client = new HttpClient(handler);
client.BaseAddress = new Uri("https://api.github.com/");

// You should set the version so that GitHub knows what API you area calling
client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/vnd.github.v3+json"));