ProxyController

ProxyController.cs

using HtmlAgilityPack;
using System.Collections.Specialized;
using System.IO;
using System.Net;
using System.Web.Mvc;

namespace WebApplication9.Controllers
{
    public class ProxyController : Controller
    {

        /// <summary>
        /// Adjust html node if there are relative. Action attributes require thjat we keep the document base
        /// </summary>
        public void fixNodes(HtmlDocument doc, string pageSourceURL, string tagName, string tagAttribute, string documentRoot = null)
        {
            foreach (HtmlNode node in doc.DocumentNode.SelectNodes(string.Format("//{0}/@{1}",tagName,tagAttribute)))
            {
                //Is it a relative path
                var srcValue = node.Attributes[tagAttribute].Value;
                if (!srcValue.StartsWith("http"))
                {
                    if (documentRoot!=null)
                        node.Attributes[tagAttribute].Value = "/Proxy/" + Base64Encode(documentRoot + srcValue) + "/" + Base64Encode(pageSourceURL) + "/";
                    else
                        node.Attributes[tagAttribute].Value = pageSourceURL + srcValue;
                }
            }
        }
        

        public static string Base64Encode(string plainText)
        {
            var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
            return System.Convert.ToBase64String(plainTextBytes);
        }

        public static string Base64Decode(string base64EncodedData)
        {
            var base64EncodedBytes = System.Convert.FromBase64String(base64EncodedData);
            return System.Text.Encoding.UTF8.GetString(base64EncodedBytes);
        }

        public ActionResult Index(string url,string root)
        {
            string proxyURL = string.Empty;
            try
            {
                proxyURL = Base64Decode(url);
                if (string.IsNullOrWhiteSpace(root)) //No root was sent
                    root = null;
                else
                    root = Base64Decode(root);
            }
            catch { }

            if (proxyURL != string.Empty)
            {
                HttpWebRequest request;
                if (Request.QueryString.Count==0)
                    request = (HttpWebRequest)WebRequest.Create(proxyURL);
                else
                {
                    request = (HttpWebRequest)WebRequest.Create(proxyURL + "?" + Request.QueryString);
                }
                //Use same method
                request.Method = Request.HttpMethod;
                //Transfer Headers
                CopyHeaders(Request.Headers,request.Headers);

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                //Transfer Headers
                CopyHeaders(response.Headers, Response.Headers);

                if (response.StatusCode.ToString().ToLower() == "ok")
                {
                    string contentType = response.ContentType;
                    Stream content = response.GetResponseStream();
                    //StreamReader contentReader = new StreamReader(content);
                    //var text = contentReader.ReadToEnd();
                    var doc = new HtmlDocument();
                    doc.Load(content);
                    
                    root = root ?? proxyURL;
                    fixNodes(doc, root, "img", "src");
                    fixNodes(doc, root, "form", "action",root);
                    Response.ContentType = contentType;
                    doc.Save(Response.OutputStream);
                }
            }
            return Content("");
        }

        /// <summary>
        /// Quick function to copy header values between two collections
        /// </summary>
        static void CopyHeaders(NameValueCollection to, NameValueCollection from)
        {
            foreach (string header in from.AllKeys)
            {
                try
                {to.Add(header, from[header]);}
                catch
                {}
            }
        }
    }
}

i am trying to run the solution but its throwing error please let us know if we can get complete solution.Thanks in advance

I'm sorry. I don't think I have all the code for this sample. But if you let me know what errors do you have I can certainly help your fix them.