RSS feed does not load in WebView correctly

I created an RSS reader via Xcode and it seems to have problems when I load the CRAIGSLIST RSS feed into NSURL. It seems to work with the code below. But when I put Craigslist RSS there, it doesn't bring me 404 error on craigslist. Any thoughts?

- (void)viewDidLoad {
[super viewDidLoad];
feeds = [[NSMutableArray alloc] init];
NSURL *url = [NSURL URLWithString:@"http://images.apple.com/main/rss/hotnews/hotnews.rss"];
parser = [[NSXMLParser alloc] initWithContentsOfURL:url];
[parser setDelegate:self];
[parser setShouldResolveExternalEntities:NO];
[parser parse];