Sockets in C#: How to make a HEAD request

this sample have been taken from: http://stackoverflow.com/questions/523930/sockets-in-c-how-to-get-the-response-stream and only one single line needed to be adapted to make a HTTP HEAD request instead of a get

using System; 
using System.Collections.Generic; 
using System.IO; 
using System.Net; 
using System.Net.Sockets; 
using System.Text; 
using System.IO.Compression;

namespace HttpUsingSockets
{
  public class Program2
  {
    private static readonly Encoding DefaultEncoding = Encoding.ASCII;
    private static readonly byte[] LineTerminator = new byte[] { 13, 10 };

    public static void Main2()
    {
      var host = "stackoverflow.com";
      var url = "/questions/523930/sockets-in-c-how-to-get-the-response-stream";

      IPHostEntry ipAddress = Dns.GetHostEntry(host);
      var ip = new IPEndPoint(ipAddress.AddressList[0], 80);
      using (var socket = new Socket(ip.AddressFamily, SocketType.Stream, ProtocolType.Tcp))
      {
        socket.Connect(ip);
        using (var n = new NetworkStream(socket))
        {
          // SendRequest(n, new[] { "GET " + url + " HTTP/1.1", "Host: " + host, "Connection: Close", "Accept-Encoding: gzip" });
          SendRequest(n, new[] { "HEAD " + url + " HTTP/1.1", "Host: " + host, "Connection: Close", "Accept-Encoding: gzip" });

          var headers = new Dictionary<string, string>();
          while (true)
          {
            var line = ReadLine(n);
            if (line.Length == 0)
            {
              break;
            }
            int index = line.IndexOf(':');
            headers.Add(line.Substring(0, index), line.Substring(index + 2));
          }
          
          Console.WriteLine("Headers: ");

          foreach (string key in headers.Keys)
          {
            Console.WriteLine("{0}: {1} ", key, headers[key]);
          }

          string contentEncoding;
          if (headers.TryGetValue("Content-Encoding", out contentEncoding))
          {
            Stream responseStream = n;
            if (contentEncoding.Equals("gzip"))
            {
              responseStream = new GZipStream(responseStream, CompressionMode.Decompress);
            }
            else if (contentEncoding.Equals("deflate"))
            {
              responseStream = new DeflateStream(responseStream, CompressionMode.Decompress);
            }

            var memStream = new MemoryStream();

            var respBuffer = new byte[4096];
            try
            {
              int bytesRead = responseStream.Read(respBuffer, 0, respBuffer.Length);
              while (bytesRead > 0)
              {
                memStream.Write(respBuffer, 0, bytesRead);
                bytesRead = responseStream.Read(respBuffer, 0, respBuffer.Length);
              }
            }
            finally
            {
              responseStream.Close();
            }

            var body = DefaultEncoding.GetString(memStream.ToArray());
            Console.WriteLine(body);
          }
          else
          {
            while (true)
            {
              var line = ReadLine(n);
              if (line == null)
              {
                break;
              }
              Console.WriteLine(line);
            }
          }
        }
      }
    }

    static void SendRequest(Stream stream, IEnumerable<string> request)
    {
      foreach (var r in request)
      {
        var data = DefaultEncoding.GetBytes(r);
        stream.Write(data, 0, data.Length);
        stream.Write(LineTerminator, 0, 2);
      }
      stream.Write(LineTerminator, 0, 2);
      // Eat response 
      var response = ReadLine(stream);
    }

    static string ReadLine(Stream stream)
    {
      var lineBuffer = new List<byte>();
      while (true)
      {
        int b = stream.ReadByte();
        if (b == -1)
        {
          return null;
        }
        if (b == 10)
        {
          break;
        }
        if (b != 13)
        {
          lineBuffer.Add((byte)b);
        }
      }
      return DefaultEncoding.GetString(lineBuffer.ToArray());
    }
  }
}