title: iPhone - UIWebview doesn't save authentication to sites
body: <p>For these purposes, let say I have an application which contains a single UIWebview.</p>
  
  <p>I'm loading a request to any of these sites: facebook, gmail, twitter, etc., and receive a login screen.</p>
  
  <p>The thing is - that if I log in and relaunch the app, I will have to go through the login screen again.</p>
  
  <p>In Mobile Safari/Google app for example I would retain my login cookie/session details/whatnot and wouldn't need to enter my user credentials again. That is the behavior I want to have.</p>
  
  <p>Stuff I tried:</p>
  
  <ul>
  <li>sending cookies from the NSHTTPCookieStorage via the NSURLRequest.</li>
  <li>Persisting the cookies myself to NSUserDefaults, but no luck.</li>
  </ul>
  
  <p>How can I achieve the behavior Mobile Safari &amp; Google app has?</p>