ASP.NET RSS Toolkit With Proxy Server

Lots of ASP.NET developers took advantage of the free ASP.NET RSS toolkit to consume and provide RSS feeds. Thanks to dmitry in a matter of minutes, we will have a nice and robust toolkit which can be intergrated easily in our web application. However, After i finished my application and deploy it on one of our web servers, Consuming RSS stopped working. The error message was "unable to connect to remote server". After investigating and contacting dmitry, i realized our proxy server was rejecting the request. I looked into the open source code provided and knew that the RSS was being loaded directly into an XmlDocument. All we needed is to send an HttpWebRequest, set the proxy configuration, read the response, and finally load the XmlDocument. 

In DownloadManager Class, replace DownloadFeedDom by the below

          //// look for disk cache first
            CacheInfo dom = TryLoadFromDisk(url);

            if (CacheReadable(dom))
                return dom;

            string ttlString = null;
            HttpWebRequest webRequest = null;
            string strResult = null;
                // Create a new web request
                webRequest = WebRequest.Create(url) as HttpWebRequest;
                // Check if ProxyServerUrl in the appSettings is not empty
                if (!string.IsNullOrEmpty(WebConfigurationManager.AppSettings["ProxyServerUrl"].ToString()))
                    // instantiate a new WebProxy class and send the ProxyServerUrl to the contructor parameter
                    System.Net.WebProxy proxy = new System.Net.WebProxy(WebConfigurationManager.AppSettings["ProxyServerUrl"].ToString(), true);
                    // Set the proxy credentials
                    proxy.Credentials = new NetworkCredential(WebConfigurationManager.AppSettings["PassThroughUser"].ToString(), WebConfigurationManager.AppSettings["PassThroughPwd"].ToString());
                    // Set the WebRequest proxy property by the WebProxy class already configured
                    webRequest.Proxy = proxy;
                // Read the response
                using (StreamReader sr = new StreamReader(webRequest.GetResponse().GetResponseStream()))
                    // Set strResult to the response
                    strResult = sr.ReadToEnd();
            // Load xml From the string
            XmlDocument doc = new XmlDocument();

            if (doc.SelectSingleNode("/rss/channel/ttl") != null)
                ttlString = doc.SelectSingleNode("/rss/channel/ttl").Value;

            //// compute expiry
            int ttlMinutes = GetTtlFromString(ttlString, _defaultTtlMinutes);
            DateTime utcExpiry = DateTime.UtcNow.AddMinutes(ttlMinutes);

            //// save to disk
            return TrySaveToDisk(doc, url, utcExpiry);

P.S: I would like to thank dmitry for his quick response eventhough i know that he would be busy.

Hope this helps,

Published 14 August 2008 04:05 PM by haissam


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