iOS获取谷歌加分享计数

我想获取在我的iOS应用中谷歌加分享链接的次数。我想下面的代码iOS获取谷歌加分享计数

NSString *post = @"[{\"method\":\"pos.plusones.get\",\"id\":\"p\",\"params\":{\"nolog\":true,\"id\":\"http://stylehatch.co/\",\"source\":\"widget\",\"userId\":\"@viewer\",\"groupId\":\"@self\"},\"jsonrpc\":\"2.0\",\"key\":\"p\",\"apiVersion\":\"v1\"}]"; 

NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; 

NSString *postLength = [NSString stringWithFormat : @"%lu",(unsigned long)[postData length]]; 

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; 
[request setURL:[NSURL URLWithString:@"https://clients6.google.com/rpc?key=my_api_key"]]; 

[request setHTTPMethod:@"POST"]; 

[request setValue:postLength forHTTPHeaderField:@"Content-Length"]; 

[request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; 

[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; 

[request setHTTPBody:postData]; 

NSURLResponse *requestResponse; 

NSError *err; 

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&requestResponse error:&err]; 

return data;

但它返回以下错误