Question

This is the download code:

private string downloadContent()
        {
            WebRequest request = WebRequest.Create(url);
            request.Method = "GET";
            response = request.GetResponse();
            Stream stream = response.GetResponseStream();
            reader = new StreamReader(stream);
            string content = reader.ReadToEnd();
            return content;
        }

The exception was on the line:

response = request.GetResponse();

This is the Exception:

system.Net.WebException was unhandled by user code
  Message=The remote server returned an error: (502) Bad Gateway.
  Source=System
  StackTrace:
       at System.Net.HttpWebRequest.GetResponse()
       at ChatrollLogger.Form1.downloadContent() in D:\C-Sharp\ChatrollLogger\ChatrollLogger\ChatrollLogger\Form1.cs:line 228
       at ChatrollLogger.Form1.backgroundWorker1_DoWork(Object sender, DoWorkEventArgs e) in D:\C-Sharp\ChatrollLogger\ChatrollLogger\ChatrollLogger\Form1.cs:line 112
       at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
       at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
  InnerException: 

What could be the problem ? Im downloading the ocntent from the site each n seconds.
Most of the times no problems so far i got this exception once only.

Line 112 is:

string content = downloadContent();

And line 228 is:

response = request.GetResponse();

Answer 1

(502) Bad Gateway could mean that the remote server is having trouble (site down, server being restarted etc)

From http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html:

10.5.3 502 Bad Gateway

The server, while acting as a gateway or proxy, received an invalid response from the 
upstream server it accessed in attempting to fulfill the request.