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(502)Bad Gateway Returned From HttpWebRequest In C#

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The solutions is to set the default proxy for the web request and assign user agent to it as shown below:
ListURL = String.Format("your_xml_feed_or_API_url_sample");  
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(ListURL);  
request.Timeout = 900000000;  
request.Proxy = HttpWebRequest.DefaultWebProxy;  
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)";  

HttpWebResponse response = (HttpWebResponse)request.GetResponse();  
Stream dataStream = response.GetResponseStream();  
dataStream = response.GetResponseStream();  
StreamReader reader = new StreamReader(dataStream);  
ListingSource = reader.ReadToEnd();  
ListingSource = System.Web.HttpUtility.HtmlDecode(ListingSource);
Cheers!

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