C# Web Proxy request problem

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C#

I am trying to make a web proxy. Here is what I have so far:

IPHostEntry IPHost = Dns.GetHostEntry(sURL);
Console.WriteLine("Resolved:{0}", 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 OK");

NetworkStream ns = new NetworkStream(IPsocket);
StreamWriter sw = new StreamWriter(ns);
StreamReader sr = new StreamReader(ns);


for (int i = 0; i < lista.Count; i++)
{
    sw.WriteLine(lista[i]);
    Console.WriteLine(lista[i]);
}
sw.Flush();
string response = sr.ReadToEnd();

And how I read the request:

StreamReader sr = new StreamReader(s);
string plusz = "";
plusz = sr.ReadLine();
while (plusz != "")
{
    lista.Add(plusz);
        plusz = sr.ReadLine();
}
return lista;

The request looks like this:

GET http://google.com/ HTTP/1.1
Host: google.com
Proxy-Connection: keep-alive
Cache-Control: max-age=0
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.12 Safari/535.11
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: gzip,deflate,sdch
Accept-Language: hu-HU,hu;q=0.8,en-US;q=0.6,en;q=0.4
Accept-Charset: ISO-8859-2,utf-8;q=0.7,*;q=0.3
Cookie: rememberme=true; NID=54=l  
(...)
 pY

And as you can see I sent this exactly. The problem is that the program stops at the sr.ReadToEnd() method. It is just waiting for the data to arrive, but nothing happens. If I send a wrong request, then it works, so the browser displays the wrong request page (400).