响应200OK但代码进入restkit中的故障块

Question

我已连接查尔斯来检查通话的响应。响应头返回200OK，但即使这样，代码也会进入故障块。它是否必须对定义映射的方式做任何事情，还是其他一些微不足道的问题？

NSString *reviewsRequest = [NSString stringWithFormat:@"reviews/%@", reviewerId];
[MTAuthHandler refreshTokenIfExpired:^(id result, NSError *error) {
    [MTRestkitManager instance].objectManager.requestSerializationMIMEType = RKMIMETypeJSON;

    [[MTRestkitManager instance].objectManager getObjectsAtPath:reviewsRequest parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
        NSLog(@"success");
        if (completion) {
            completion(YES, nil);
        }
    } failure:^(RKObjectRequestOperation *operation, NSError *error) {
        NSLog(@"failed");
        if (completion) {
            completion(NO, error);
        }
    }];
}];

错误消息显示 - NSLocalizedDescription =预期状态代码（400-499），得到200

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