C#使用SOCKET获取ASPSESSIONID、PHPSESSID等Cookie

简单写了一个小类，获取ASPSESSIONID、PHPSESSID等WebClient无法获取的Cookies，如果高手有更好的意见，欢迎补充。

代码如下：

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

namespace EatOrange
{
    // 使用SOCKET获取Cookie信息
    class CookieGet
    {
        private Socket socket;

        public string GetCookie(string strHost, string strGet, string strReferer)
        {
            IPEndPoint hostEndPoint;
            IPAddress[] hostAddresses;
            StringBuilder stringBuilder = new StringBuilder();
            byte[] byteSend;

            // 首先构造HTTP请求头
            stringBuilder.Append("GET " + strGet + " HTTP/1.1\r\n");
            stringBuilder.Append("Accept: */*\r\n");
            stringBuilder.Append("Referer: " + strReferer + "\r\n");
            stringBuilder.Append("Accept-Language: zh-CN\r\n");
            stringBuilder.Append("User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:11.0) Gecko/20100101 Firefox/11.0");
            stringBuilder.Append("Host: " + strHost + "\r\n");
            stringBuilder.Append("Connection: Keep-Alive\r\n\r\n");

            byteSend = System.Text.Encoding.ASCII.GetBytes(stringBuilder.ToString());

            // 利用SOCKET发送HTTP协议
            int conPort = 80;

            // 获取DNS服务器信息
            hostAddresses = Dns.GetHostAddresses(strHost);

            // 给每个IP发送get请求(因为一个域名可能对应多个IP地址)
            foreach (IPAddress addr in hostAddresses)
            {
                hostEndPoint = new IPEndPoint(addr, conPort);

                socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                socket.Connect(hostEndPoint);

                if (socket.Connected)
                {
                    socket.Send(byteSend, byteSend.Length, 0);
                }
            }
            // 获取服务器的返回信息
            Byte[] byteReceive = new Byte[1024];
            Int32 bytes = socket.Receive(byteReceive);

            string str = Encoding.Default.GetString(byteReceive, 0, bytes);

            // 获取Cookie信息

            int pos1, pos2;
            pos1 = str.IndexOf("Set-Cookie: ") + 12;            // 12 is the length of "Set-Cookie: "

            if (pos1 == -1)
                return "<Error>Not Found</Error>";

            pos2 = str.IndexOf("\r\n", pos1);

            return str.Substring(pos1, pos2 - pos1);
        }
    }
}