gistfile1.m

#pragma mark - Original

- (NSURLSessionDataTask *)GET:(NSString *)URLString
                   parameters:(id)parameters
                      success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
                      failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure;

#pragma mark - Overrides

- (NSURLSessionDataTask *)GET:(NSString *)URLString
                   parameters:(id)parameters
                      success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
                         fail:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
{
    return [self GET:URLString parameters:parameters
             success:^(NSURLSessionDataTask *task, id responseObject) { success(task, responseObject); }
             failure:^(NSURLSessionDataTask *task, NSError *error)
    {
        [self processCommonError:task withError:error];
        failure(task, error);
    }];
}