Quote: 引用:

<%@ WebHandler Language="C#" Class="webproxy" %>

using System;
using System.Web;
using System.Net;
using System.Xml.Serialization;


public class webproxy : IHttpHandler
{
    HttpResponse Response;
    HttpRequest Request;

    public Uri url;

    public void ProcessRequest(HttpContext context)
    {
        this.Response = context.Response;
        this.Request = context.Request;

        string qs = context.Request.Url.Query;
        if (string.IsNullOrEmpty(qs) 
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 qs.Length < 10)
        {
            context.Response.StatusCode = 404;
            return;
        }
        ExpireProc();
         
        qs = qs.Substring(1);
        if (!qs.StartsWith("http://", StringComparison.OrdinalIgnoreCase))
        {
            Uri rdURI = GetRequestUrl(qs);
            if (System.Text.RegularExpressions.Regex.IsMatch(rdURI.AbsolutePath,
                    "\\.(js
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jpg
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png
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gif
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css
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bmp)$", System.Text.RegularExpressions.RegexOptions.IgnoreCase))
            {//一般非导航页面
                this.url = rdURI;
            }
            else
            {//一般性用于导航
                Response.Redirect("?" + GetRequestUrl(qs).ToString());
                return;
            }
        }
        else
            this.url = new Uri(qs);

        string reffer = null;
        if (Request.UrlReferrer != null)
        {
            reffer = Request.UrlReferrer.Query;
            if (!string.IsNullOrEmpty(reffer))
                reffer = reffer.Substring(1);
        }

        HttpWebRequest web = (HttpWebRequest)WebRequest.Create(this.url);
        web.Accept = string.Join(", ", Request.AcceptTypes);
        web.Headers["Accept-Encoding"] = "gzip"; 
 

        string tValue;

        tValue = Request.Headers["Accept-Language"];
        if (!string.IsNullOrEmpty(tValue))
            web.Headers["Accept-Language"] = tValue;

        web.AllowAutoRedirect = true;
        web.CookieContainer = Cookies;
        web.UserAgent = Request.UserAgent;
        web.Referer = reffer;
        web.AutomaticDecompression = DecompressionMethods.GZip;
        web.Timeout = 2000;
        WebResponse rsp = null;

        try
        {
            rsp = web.GetResponse();
        }
        catch (WebException ex)
        {
            Response.StatusCode = (int)ex.Status;
            rsp = ex.Response;
        }
        catch (Exception ex)
        {
            Response.ContentType = "text/txtfile";
            Response.Write(ex.ToString());
            return;
        }
        
        if (rsp == null)
        {
            return;
        }
        System.Text.Encoding ec = System.Text.ASCIIEncoding.Default;
        if (!string.IsNullOrEmpty(rsp.ContentType))
        {
            Response.ContentType = rsp.ContentType;
            System.Text.RegularExpressions.Match mc = System.Text.RegularExpressions.Regex.Match(rsp.ContentType, "charset=([^;]+)");
            if (mc.Success)
                ec = System.Text.Encoding.GetEncoding(mc.Groups[1].Value);
        }


        if (rsp.Headers["Set-Cookie"] != null)
        {
            Cookies = web.CookieContainer;
        }
        
        using (System.IO.Stream stm = rsp.GetResponseStream())
        {
            string ct = rsp.ContentType;
            if (string.IsNullOrEmpty(ct))
                ct = "text/html";

            if (!ct.Contains("text/css") && !ct.Contains("text/html"))
            {
                Response.Cache.SetLastModified(DateTime.Now);
                Response.Cache.SetExpires(DateTime.Now.AddMinutes(20));
                TranslateDirect(stm);
                return;
            }
            Response.Cache.SetLastModified(DateTime.Now);
            Response.Cache.SetExpires(DateTime.Now.AddMinutes(5));


            Response.ContentEncoding = ec;
            System.IO.StreamReader reader = new System.IO.StreamReader(stm, ec);
            string html = reader.ReadToEnd(); 
 
            html = System.Text.RegularExpressions.Regex.Replace(html, @"(<(a
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link)[^>]+href[^\w\/\\]{1,10})", "$1webproxy.ashx?");
            html = System.Text.RegularExpressions.Regex.Replace(html, @"(<(img
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script
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iframe)[^>]+src[^\w\/\\]{1,10})", "$1webproxy.ashx?");
            html = System.Text.RegularExpressions.Regex.Replace(html, @"(background(
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-image)\: {0,}url\([^\w\/\\]{0,1})", "$1webproxy.ashx?");

            Response.Write(html);
        }

    }

    void TranslateDirect(System.IO.Stream stm)
    {
        Response.BufferOutput = false;
        byte[] bin = new byte[4096];
        int r;

        do
        {
            r = stm.Read(bin, 0, 4096);
            if (r > 0)
            {
                if (!Response.IsClientConnected)
                    break;
                Response.OutputStream.Write(bin, 0, r);
                Response.Flush();
            }
        } while (r != 0);
    }

    #region Cookies
    CookieContainer _cc = null;
    CookieContainer Cookies
    {
        get
        {
            return null;
            if (_cc != null)
                return _cc;
            string cID = Convert.ToBase64String(System.Text.ASCIIEncoding.Default.GetBytes(this.url.Host));
            cID = cID.Replace('=', '_');
            HttpCookie cook = Request.Cookies[cID];
            if (cook == null)
                return new CookieContainer();

            byte[] bin = Convert.FromBase64String(cook.Value);
            if (bin == null)
                return null;
            using (System.IO.MemoryStream stm = new System.IO.MemoryStream(bin))
            {
                using (System.IO.Compression.GZipStream zip = new System.IO.Compression.GZipStream(stm, System.IO.Compression.CompressionMode.Decompress))
                {
                    XmlSerializer XS = new XmlSerializer(typeof(CookieContainer));
                    return (CookieContainer)XS.Deserialize(zip);
                }
            }
        }
        set
        {
            return;
            _cc = value;
            string cID = Convert.ToBase64String(System.Text.ASCIIEncoding.Default.GetBytes(this.url.Host)); 
 
            cID = cID.Replace('=', '_');
            HttpCookie cookie = new HttpCookie(cID);
            Response.Cookies.Add(cookie);
            if (value == null)
            {
                cookie.Expires = DateTime.Now.AddYears(-1);
                return;
            }

            using (System.IO.MemoryStream stm = new System.IO.MemoryStream())
            {
                using (System.IO.Compression.GZipStream zip = new System.IO.Compression.GZipStream(stm, System.IO.Compression.CompressionMode.Compress))
                {
                    XmlSerializer XS = new XmlSerializer(typeof(CookieContainer));
                    XS.Serialize(zip, value);
                    zip.Flush();
                    cookie.Value = Convert.ToBase64String(stm.ToArray());
                    cookie.Expires = DateTime.Now.AddDays(1);
                }
            }
        }
    }
    #endregion

    Uri GetRequestUrl(string offset)
    {
        Uri src = Request.UrlReferrer;
        if (src == null)
            return null;
        string qs = src.Query;
        if (string.IsNullOrEmpty(qs) 
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 qs.Length < 10)
            return null;
        src = new Uri(qs.Substring(1));
        return new Uri(src, offset);

    }
    
    /// <summary>
    /// 过期信息检查并处理
    /// </summary>
    void ExpireProc()
    {
        string t = Request.Headers["If-Modified-Since"];
        if (string.IsNullOrEmpty(t))
            return;
        DateTime last;
        if (!DateTime.TryParse(t, out last))
            return;
        if ((DateTime.Now - last).TotalMinutes > 20)
            return;
        Response.StatusCode = 304;
        Response.End();
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}

哥用来翻墙用的，简修改即可实现你的这个效果

这东西能翻墙？表示怀疑，墙会对明文的url和敏感词过滤的。只能用vpn或者ssl这样的加密方式。