title: NSHTTPCookieStorage for same URL but different users
body: <p>May be this is a dumb question, but I want to store cookies for same url but different for usernames. How can this be achieved using NSHTTPCookieStorage ? This is how I store cookies from response.</p>
  
  <pre><code>        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
  
          NSDictionary *headerFields = [httpResponse allHeaderFields];
  
  
          NSArray* cookies = [NSHTTPCookie
                              cookiesWithResponseHeaderFields:headerFields
                              forURL:[NSURL URLWithString:@""]];
  
          for (NSHTTPCookie *cookie in cookies) {
              [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
          }
  
         NSString *urlString = ...;
  
          [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookies:cookies forURL:[NSURL URLWithString:urlString] mainDocumentURL:nil];
  </code></pre>