objective-c – 我应该使用什么重定向uri(OAuth 2.0)？

//● urn:xxxxxxx:oob

//● http://localhostxxxxxx

当然,我使用这些项目并成功请求令牌谷歌.但是当我点击授权按钮时(比如“你想授权这个应用程序吗？”是的),
两个响应发生.

如果我使用urnxxxxxx,我会收到“操作无法完成.(com.google.HTTPStatus错误404.)”.

//Or If I use http://localhostxxxxxxxxxxxxx and click Yes button,then nothing    
happens.

我该怎么办？ (以下代码适用于谷歌阅读器.)

#import "MasterViewController.h"

#import "DetailViewController.h"

#import "GTMOAuth2Authentication.h"

#import "GTMOAuth2ViewControllerTouch.h"

#import "GTMOAuth2WindowController.h"

static NSString *const kKeychainItemName = @"Greader";


@interface MasterViewController () {
    NSMutableArray *_objects;
}
@end

@implementation MasterViewController


- (IBAction)authentication:signInToGoogle:(id)sender;

{}

- (GTMOAuth2Authentication * ) authForGoogle
{ 
    NSString * url_string = @"http://www.google.com/reader/api/";
    NSURL * tokenURL = [NSURL URLWithString:url_string];

    NSString * redirectURI = @"xxxxoob";
    GTMOAuth2Authentication * auth;
    auth = [GTMOAuth2Authentication authenticationWithServiceProvider:@"reader"
                                                         tokenURL:tokenURL
                                                      redirectURI:redirectURI
                                                         clientID:@"xxxxx"
                                                     clientSecret:@"xxxx"];

    auth.scope = @"http://www.google.com/reader/api/";
    return auth;
}


- (void)signInToGoogle

{
    GTMOAuth2Authentication * auth = [self authForGoogle];
    NSString* auth_string = @"https://accounts.google.com/o/oauth2/auth";
    NSURL * authURL = [NSURL URLWithString:auth_string];

    GTMOAuth2ViewControllerTouch * viewController;
    viewController = [[GTMOAuth2ViewControllerTouch alloc]initWithAuthentication:auth
                                                             authorizationURL:authURL
                                                             keychainItemName:kKeychainItemName
                                                                     delegate:self
                                                             finishedSelector:@selector(viewController:finishedWithAuth:error:)];
    [self.navigationController pushViewController:viewController animated:YES];
}