I am trying to call the Stack Exchange API to get a list of users.  This is from my iOS app:
   
    NSString *str=[NSString stringWithFormat:@"http://stackexchange.com/oauth /2.2/users?order=desc&sort=reputation&site=stackoverflow&Client_Id=5029"]];

    NSURL *url = [NSURL URLWithString:str];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [NSURLConnection sendAsynchronousRequest:request
                                       queue:[NSOperationQueue mainQueue]
                           completionHandler:^(NSURLResponse *response,
                                               NSData *data, NSError *connectionError)
     {
         if (data.length > 0 && connectionError == nil)
         {
             NSDictionary *greeting = [NSJSONSerialization JSONObjectWithData:data
                                                                      options:0
                                                                        error:NULL];
         }
     }];

What is wrong with the call?  I did not get list of users. Its give HTML request.

I want to show a list of users from Stack Overflow.