ItemServiceConsoler.cs

using System;
using System.Net;
using System.Net.Http;
using System.Text;

namespace ItemServiceConsoler
{
  class Program
  {
    static void Main(string[] args)
    {
      // Note HTTPS required for authentication
      var baseAddress = new Uri("https://sc80rev150223");

      using (var client = new HttpClient() { BaseAddress = baseAddress })
      {
        // Only enable ServerCertificateValidationCallback if doing local testing. It will ignore certificate validation
        //ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;
        
        var content = new StringContent(
          @"{ ""domain"": ""sitecore"", ""username"": ""admin"", ""password"": ""b"" }",
          Encoding.UTF8,
          "application/json");
          
        var authResult = client.PostAsync("sitecore/api/ssc/auth/login", content).Result;

        Console.WriteLine(authResult.StatusCode);
        Console.ReadLine();

        var itemResult = client.GetAsync("sitecore/api/ssc/item/{110D559F-DEA5-42EA-9C1C-8A5DF7E70EF9}").Result;

        Console.WriteLine(itemResult.StatusCode);
        Console.WriteLine(itemResult.Content.ReadAsStringAsync().Result);
        Console.ReadLine();

      }
    }
  }
}