title: AFNetworking disable caching
body: <p>I'm trying to get a JSON file from a server then display it in a table, this works fine, however, for some reason AFNetworking is caching the JSON file even after a app restart.
  How can I disable this?</p>
  
  <pre><code> NSURL *url = [NSURL URLWithString:@"http://?json"];
  
      NSURLRequest *request = [NSURLRequest requestWithURL:url];
  
      AFJSONRequestOperation *operation = [AFJSONRequestOperation
                                           JSONRequestOperationWithRequest:request
                                           success:^(NSURLRequest *request, NSHTTPURLResponse *response, id responseObject)
                                           {
  
                                               self.dataget = [responseObject objectForKey:@"data"];
                                               [self.tableView reloadData];
  
  
                                           }
                                           failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id responseObject)
                                           {
  
                                               [HUD hideUIBlockingIndicator];
                                           }];
  
      [operation start];
  </code></pre>
  
  <p>The json file is probably not cached server side:
  <code>Cache-Control: no-cache[CRLF]</code></p>