コードは次のとおりです。
NSURL *newsUrl = [NSURL URLWithString:@"/Document/News/1593" relativeToURL:[NSURL URLWithString:@"http://exist.ru"]];
// Outputs "http://exist.ru/Document/News/1593"
NSLog(@"%@", [newsUrl absoluteString]);
// works
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[newsUrl absoluteString]]];
// doesn't work
//[[UIApplication sharedApplication] openURL:newsUrl];
Appleのバグですか?