访问 google reader 的 Endpoints API 时出错

我正在尝试在iPhone APP中实现google reader，到目前为止我已经成功收到了sid and auth。当我尝试使用以下命令调用 Endpoints API 时，问题就出现了GET..这是代码：

 ASIHTTPRequest *request = [self requestForAPIEndpoint:@"https://www.google.com/reader/api/0/subscription/list?output=json"];
 [request setDelegate:self];
 [request startAsynchronous];

- (ASIHTTPRequest *) requestForAPIEndpoint: (NSString *) apiEndpoint
{
 ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString: apiEndpoint]];
[request addRequestHeader: @"User-Agent" value: @"YourClient"];
 [request addRequestHeader: @"Cookie" value: signature];
 NSLog(@"Sig = %@",signature);
 [request addRequestHeader: @"Authorization" value: autho];
 return request.
}

作者和签名设置正确。然而每次我接到回电时 -(void)requestFailed:(ASIHTTPRequest *)请求方法。我做错了什么？我是否需要注册一些访问 API 的位置并将用户代理设置为该名称？

我修改了请求API端点方法如下，我也有同样的问题。

- (ASIHTTPRequest *) requestForAPIEndpoint: (NSString *) apiEndpoint
{

NSDictionary *properties = [[[NSMutableDictionary alloc] init] autorelease];
[properties setValue:signature forKey:NSHTTPCookieValue];
[properties setValue:@"SID" forKey:NSHTTPCookieName];
[properties setValue:@".google.com" forKey:NSHTTPCookieDomain];
[properties setValue:@"1600000000" forKey:NSHTTPCookieExpires];
[properties setValue:@"/" forKey:NSHTTPCookiePath];
NSHTTPCookie *cookie = [[[NSHTTPCookie alloc] initWithProperties:properties] autorelease];

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString: apiEndpoint]];
[request setUseCookiePersistence:NO];
[request setRequestCookies:[NSMutableArray arrayWithObject:cookie]];

[request addRequestHeader: @"User-Agent" value: @"YourClient"];
[request addRequestHeader: @"Authorization" value: autho];
 return request;
} 

如果您使用 ClientLogin（通过Authorization标题）。看http://code.google.com/p/google-reader-api/wiki/Authentication http://code.google.com/p/google-reader-api/wiki/Authentication了解支持的身份验证方案。

此外，Authorization标头的格式应为GoogleLogin auth=<auth token> where <auth token> is the Auth来自 ClientLogin 响应的值。