C# Web Proxy Server

using System;using System.Net;using System.Net.Sockets;using System.Text;using System.IO;using System.Threading;namespace WebProxy2
{class WebProxy2
{
Socket clientSocket;
Byte[] read = new byte[1024];
Byte [] Buffer = null;
Encoding ASCII = Encoding.ASCII;const string HTTP_VERSION = "HTTP/1.0";const string CRLF = "\r\n";
Byte[] RecvBytes = new Byte[4096];public WebProxy2(Socket socket)
{this.clientSocket = socket;
}public void run()
{
String clientmessage = " ", sURL = " ";int bytes = readmessage(read, ref clientSocket, ref clientmessage);if(bytes == 0)
{return;
}int index1 = clientmessage.IndexOf(' ');int index2 = clientmessage.IndexOf(' ', index1 + 1);if((index1 == -1) || (index2 == -1))
{throw new IOException();
}
Console.WriteLine("Connecting to Site: {0}", clientmessage.Substring(index1 + 1, index2 - index1));
Console.WriteLine("Connection from {0}", clientSocket.RemoteEndPoint);string part1 = clientmessage.Substring(index1 + 1, index2 - index1);int index3 = part1.IndexOf('/', index1 + 8);int index4 = part1.IndexOf(' ', index1 + 8);int index5 = index4 - index3;
sURL = part1.Substring(index1 + 4, (part1.Length - index5) - 8);try{
IPHostEntry IPHost = Dns.Resolve(sURL);
Console.WriteLine("Request resolved: ", IPHost.HostName);string [] aliases = IPHost.Aliases;
IPAddress[] address = IPHost.AddressList;
Console.WriteLine(address[0]);
IPEndPoint sEndpoint = new IPEndPoint(address[0], 80);
Socket IPsocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream,ProtocolType.Tcp);
IPsocket.Connect(sEndpoint);if(IPsocket.Connected)
Console.WriteLine("Socket connect OK");string GET = clientmessage;
Byte[] ByteGet = ASCII.GetBytes(GET);
IPsocket.Send(ByteGet, ByteGet.Length, 0);
Int32 rBytes = IPsocket.Receive(RecvBytes, RecvBytes.Length, 0);
Console.WriteLine("Recieved {0}", + rBytes);//Buffer = RecvBytes;String strRetPage = null;
strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, rBytes);while (rBytes > 0)
{
rBytes = IPsocket.Receive(RecvBytes, RecvBytes.Length, 0);
strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, rBytes);
}
IPsocket.Shutdown(SocketShutdown.Both);
IPsocket.Close();
sendmessage(clientSocket, strRetPage);
}catch (Exception exc2) 
{
Console.WriteLine(exc2.ToString());
}
}private int readmessage(byte [] ByteArray, ref Socket s, ref String clientmessage)
{int bytes = s.Receive(ByteArray, 1024, 0);string messagefromclient = Encoding.ASCII.GetString(ByteArray);
clientmessage = (String)messagefromclient;return bytes;
}private void sendmessage(Socket s, string message)
{
Buffer = new Byte[message.Length + 1];int length = ASCII.GetBytes(message, 0, message.Length, Buffer, 0);
s.Send(Buffer, length, 0);
}static void Main(string[] args)
{const int port = 8889;
TcpListener tcplistener = new TcpListener(port);
Console.WriteLine("Listening on port {0}", + port);
tcplistener.Start();while(true)
{
Socket socket = tcplistener.AcceptSocket();
WebProxy2 webproxy = new WebProxy2(socket);
Thread thread = new Thread(new ThreadStart(webproxy.run));
thread.Start();
}
}
}
}