title: Extending a Protocol to extend Delegate Methods for NSURLConnection
body: <p>i am trying to overwrite the NSURLConnection Delegate but i dont know where to start, can someone please give some more kind of informations and a little bit sample code? </p>
  
  <p>I want to extend the connectionDidFinishLoading delegate. And keep looking if the JSON-String i am becoming back got some error reporting for the user.</p>
  
  <p>it seems to me the best way to extend the delegate. It is even possible?</p>