Ios RestKit中MIME类型“text/html”的解析器

我使用的是RestKit v0.20.3，当我获得对GET HTTP请求的响应时，我无法解析它，因为我得到以下错误：

Failed to parse response data: Loaded an unprocessable response (200) 
with content type 'text/html' UserInfo=0x6c4a2b0 
{NSErrorFailingURLKey=https://helloEverybody.com/, NSUnderlyingError=0x6c4a1e0 
"The operation couldn’t be completed. (Cocoa error 3840.)"

这是我的密码：

[RKMIMETypeSerialization registerClass:[RKNSJSONSerialization class] forMIMEType:@"text/html"];

NSURL *baseUrl = [[NSURL alloc]initWithString:@"https://helloEverybody.com"];
RKObjectManager* objectManager = [RKObjectManager managerWithBaseURL:baseUrl];
[objectManager.HTTPClient setAuthorizationHeaderWithUsername:@"user" password:@"password"];
[objectManager setAcceptHeaderWithMIMEType:@"text/html"];

[objectManager getObjectsAtPath:@"" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"It worked!!: %@", [mappingResult firstObject]);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
    NSLog(@"It failed: %@", error);
}];

我读过很多类似的帖子，他们通常会将服务器响应更改为json来解决这个问题，但我不能接触服务器。我需要解析这些文本/html

有人知道我怎么做吗

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谢谢

响应是否真的有效。