如何使用NSURLSessionDataTask返回值？ Xcode中

Question

各位大家好！

我只有dependencies的3周，但总是xcode返回错误。

  

[3]（null）@＆＃34; NSLocalizedDescription＆＃34; ：@＆＃34;请求失败：不可接受   content-type：application / json＆＃34;

主要功能是：

NSURLSessionDataTask

主要目标是Zyncro的atack API，并在json中返回信息。

生成对象文档的功能是：

+ (Document * )  getDocumentInfo: (NSString *) grupo documento:(NSString *) documento {


    BDBOAuth1SessionManager *sesion = [manager getSessionManager];
    sesion.responseSerializer = [AFHTTPResponseSerializer new];
    sesion.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/plain",@"text/html", nil];
    static NSMutableDictionary *json;

    dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
    NSString *timelinePath = [NSString   stringWithFormat:@"/api/v1/rest/groups/%@/document/%@",grupo,documento];
    static NSString *check;
    sesion.completionQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

    AFHTTPRequestOperation *operation = [sesion GET:timelinePath
                                         parameters:@{}

                                            success:^(NSURLSessionDataTask *task, id requestReply) {
                                                NSString *requestReply2 = [[NSString alloc] initWithBytes:[requestReply bytes] length:[requestReply length] encoding:NSUTF8StringEncoding];

                                                NSData *data = [requestReply2 dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
                                                NSError * error;

                                               json = [NSJSONSerialization JSONObjectWithData:data options: NSJSONReadingMutableContainers error: &error];




    if (![requestReply2 isEqualToString:@""]) {


        if ([[json objectForKey:@"result"] isEqualToString:@"OK"]) {

            check = @"YES";


        }
    }
                                                dispatch_semaphore_signal(semaphore);
                                            }

                                            failure:^(NSURLSessionDataTask *task, NSError *error) {
                                                //nslo(nil, error);
                                                dispatch_semaphore_signal(semaphore);
                                            }];

    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);

     if ([check isEqualToString:@"YES"]) {
    return[Document generateDocument:[json objectForKey:@"object"]];
    //return fichero;
    }else{
        return nil;
    }

       }

我的问题是为什么如果我把可接受的内容：application / json，因为错误在应用程序/ json谢谢你们

感谢所有