HttpWebRequest to NSUrlConnection/NSUrlSession or HttpClient (with ModerHttpClient lib)

Question

We have code written in Xamarin Cross Platform that works for Android with Clients tunneling software:

           string body = "<rest_access/>";

           byte[] dataByte = Encoding.ASCII.GetBytes(body);

           HttpWebRequest request = (HttpWebRequest)WebRequest.Create(endpoint + @"/rest_access");
           request.Method = "POST";
           request.ContentType = "application/xml";
           request.Accept = "application/json";

           var credentials = System.Text.Encoding.ASCII.GetBytes(username + ":" + password);
           string encodedCredentials = System.Convert.ToBase64String(credentials);
           request.Headers.Add(HttpRequestHeader.Authorization, "Basic " + encodedCredentials);

           request.ContentLength = dataByte.Length;

           Stream stream = request.GetRequestStream();

           stream.Write(dataByte, 0, dataByte.Length);

           try
           {
               HttpWebResponse response = (HttpWebResponse)request.GetResponse();
               StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
               string responseString = reader.ReadToEnd().ToString();

               dynamic authResponse = JsonConvert.DeserializeObject(responseString);
               //Console.WriteLine("Auth response:\n" + authResponse);

               accessKey = authResponse.rest_access.access_key;

               //Console.WriteLine("kljuc " + accessKey);

               return accessKey;
           }
           catch (Exception ex)
           {
               Console.WriteLine(ex.Message);
               return "Unexpected Error";
           }

But when using this same code for iOS application tunnel does not seem to be present.
In their documentation we found:

Apps built with the Xamarin development platform can access network servers in various ways. AppTunnel with HTTP/S tunneling is supported only as follows:
• The app uses the NSURLConnection or NSURLSession APIs exposed to C# through the Xamarin.iOS binding.
• The app uses the ModernHttpClient library with NSURLSession. The ModernHttpClient library with CFNetwork will not work.
For example, the app initializes the instance of the ModernHttpClient as follows:
var httpClient = new HttpClient (new NativeMessageHandler ());

Does this mean that we have to rewrite all methods that used HttpWebRequest in them to now use one of these libs?
If so could I get some link to How to rewrite these so they are acceptable?

Answer 1

Have you tried to set the HttpClient Implementation for Xamarin.iOS in HttpClient Stack

change it to NSUrlSession or Managed