Socket模拟Http请求

问题是请求不到数据、下面是代码。求指教Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);            IPHostEntry ipHost = Dns.GetHostEntry("www.baidu.com");            IPAddress ip = ipHost.AddressList.Where(i => { return i.AddressFamily.Equals(AddressFamily.InterNetwork);}).First();            StringBuilder sb = new StringBuilder();
            //http://www.baidu.com/img/baidu_sylogo1.gif
            sb.AppendLine("GET /img/baidu_sylogo1.gif HTTP/1.1");
            sb.AppendLine("Accept: */*");
            sb.AppendLine("Accept-Language: zh-CN");
            sb.AppendLine("Content-Type: application/x-www-form-urlencoded");
            sb.AppendLine("User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; BOIE9;ZHCN)");
            sb.AppendLine("Accept-Encoding: gzip, deflate");
            sb.AppendLine("Host: www.baidu.com");
            sb.AppendLine("Connection: Keep-Alive");            socket.Connect(new IPEndPoint(ip,80));            byte[] sendData = Encoding.UTF8.GetBytes(sb.ToString());
            socket.Send(sendData);            byte[] recive = new byte[1024];            while (socket.Receive(recive) != 0)
            {
                Console.WriteLine(Encoding.UTF8.GetString(recive));
            }            socket.Shutdown(SocketShutdown.Both);            socket.Close();