title: Which exceptions should I watch for in a WebRequest call?
body: <p>I'm working on a small but vital batch application which has a step in it to download an image from a remote website I don't have any control over. This is quite simple and I got it working already but I'd like some input on the error-handling.</p>
  
  <p>The remote server doesn't always have the image requested so a 404 Not Found is actually alright, but it's vital to catch all other communications errors, like timeouts and connection errors so that it can be put on a retry queue. I'd love to get suggestions about the exception-handring, anything in particular I should think about? Any other exception types that I should filter on? </p>
  
  <pre><code>try 
  {
      // webrequest.getresponse(), read file and return image
  }
  catch (WebException webEx) 
  {
      // check the WebException/http status code and act on certain errors
      // if 404 image/file not found - ok, just return
      // other error - log and put on retry queue
  }
  catch (Exception ex) 
  {
      // some other major failure, log and alert
  }
  </code></pre>