title: Check if a URL takes you to an available destination - iPad
body: <p>In my iPad app, I am creating an NSURLConnection, and when a valid URL is provided, then I can read the returned data from the host.  However, when I put in an invalid URL, the app crashes when I try to make the request.</p>
  
  <p>What is the easiest way to determine if a URL is pointing to a host that can be accessed?</p>
  
  <p>I saw that Apple has a reachability tutorial, but that does not allow you to check if a specific host can be reached.</p>
  
  <p>Thanks.</p>