title: Cannot find protocol declaration for NSURLConnectionDataDelegate
body: <p>I am working on ios5 and have used <code>NSURLConnectionDataDelegate</code> in my application which really works fine for me. But I run the same project on ios 4.3 I am getting the error :  </p>
  
  <p><strong>Cannot find protocol declaration for NSURLConnectionDataDelegate</strong>  </p>
  
  <p>Can someone help me here?  </p>