using System;

using System.Net;

using System.Net.Http;

using System.Threading.Tasks;

public class Program

{

    // Always use HttpClient as a singleton object

    public static HttpClient _httpClient = new HttpClient() { BaseAddress = new Uri("http://al1b.pythonanywhere.com") } ;

    public async static Task Main()

    {

        var num1 = 1;

        var num2 = 4;

        Console.WriteLine("Making http-request wait ...\r\n");      

        var mathAddResult = await _httpClient.GetAsync($"/math/add/{num1}/{num2}");

​

        // 200 = OK

        if(mathAddResult.StatusCode == HttpStatusCode.OK)

        {

            // to understand http-status codes take a look on this website: https://http.cat/           

            Console.WriteLine(await mathAddResult.Content.ReadAsStringAsync());

        }

    }

}