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How to do Dynamic URL Redirect in ASP.net MVC?

I have to get html response from another website and load to my application. I written below code,

    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Linq;
    using System.Net;
    using System.Web;
    using System.Web.Mvc;

    namespace MVC_TEST.Controllers
    {
        public class DocumentCloudController : Controller
        {
            public string Index()
            {
                var result = GetResponse();
                return result;
            }

            private static string GetResponse()
            {

                var html = string.Empty;
                const string url = @"http://localhost/xxxxx/yyyyy/logon.aspx";

                var request = (HttpWebRequest)WebRequest.Create(url);
                request.AutomaticDecompression = DecompressionMethods.GZip;
                using (var response = (HttpWebResponse)request.GetResponse())
                {
                    using (var stream = response.GetResponseStream())
                    {
                        if (stream != null)
                        {
                            using (var reader = new StreamReader(stream))
                            {
                                html = reader.ReadToEnd();
                            }
                        }
                    }
                }


                return html;
            }}


        }
    }

Controls are loaded properly, But image, css and js path is mapped to relative path

    /xxxx/yyyy/dojo.js , 
    /xxxx/style/logon.css, 
    /xxxx/images/logon.png

in html, here i have to change that to actual url like below

 http://localhost/xxxx/yyyy/dojo.js , 
 http://localhost/xxxx/style/logon.js , 
 http://localhost/xxxx/images/logon.png     

One option is find these content in html replace that.

Is there any other option to change url dynamically ? Is IIS URL Rewrite module will suitable for my requirement ?

Please share your thoughts

Using IIS URL Rewrite Module could work but I would recommend using a HTML parser like HTML Agility Pack or AngleSharp to query and manipulate the DOM.

The example below is a snippet that worked for me when creating a reverse proxy:

foreach (var link in document.DocumentNode.SelectNodes("//link[@href]"))
{
    var orgHrefValue = link.GetAttributeValue("href", string.Empty);
    var updHrefValue = string.Concat("[BASE URL]", GetAbsoluteUrlString(requestedUrl, orgHrefValue).AbsoluteUri);
    link.SetAttributeValue("href", updHrefValue);
}

private static Uri GetAbsoluteUrlString(string baseUrl, string url)
{
    var uri = new Uri(url, UriKind.RelativeOrAbsolute);

    if (!uri.IsAbsoluteUri)
        uri = new Uri(new Uri(baseUrl), uri);

    return uri;
}

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