为什么RestKit会改变我的响应内容类型？ [英] why is RestKit changing my response content-type?

问题描述

简而言之：我尝试从http请求标头的内容类型设置服务器获取数据 @text / html ..但由于某些原因，RestKit将其更改为 application / JSON

In short: I try to fetch data form the server with the content-type of the http request header set as @"text/html.. but for some reason RestKit changes that to application/JSON

说明：
如果我只使用 AFNetworking 来发出此请求..事情就像一个魅力..这就是我的AFNetworking代码：

Explanation: If I were to make this request using just AFNetworking.. things work like a charm.. this is what my AFNetworking code looks like:

AFHTTPClient *client = [AFHTTPClient alloc] initWithBaseURL:
                                               [NSURL URLWithString:kApiBaseUrl]];
singleton.parameterEncoding = AFJSONParameterEncoding;
[singleton setDefaultHeader:@"Accept" value:@"text/html"];
[client getPath:getPath parameters:nil success:successCallback failure:failureCallback];

如果我使用完全相同的客户端并将其附加到

If I use that exact same client and attach it to

MyClient *client = [MyClient getSingleton];  //MyClient is instantiated as above        
self.objectManager = [[RKObjectManager alloc] initWithHTTPClient:client];
self.objectManager.managedObjectStore = self.managedObjectStore;
// this should have already been done by my client, but putting
// it here just to be sure
[self.objectManager setAcceptHeaderWithMIMEType:@"text/html"];

[[RKObjectManager sharedManager] getObjectsAtPath:kGradesPath 
                                       parameters:nil 
                                          success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
 // handle success
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
 // handle failure
}];

我得到的错误是：

 restkit.network:RKObjectRequestOperation.m:576 Object request failed: 
 Underlying HTTP request operation failed with error: Error
 Domain=org.restkit.RestKit.ErrorDomain Code=-1016 "Expected content type {(
    "application/x-www-form-urlencoded",
    "application/json"
)}, got text/html" UserInfo=0x8f7acd0

挖掘主题..我在 managedObjectRequestOperationWithRequest ，然后我检查了 HTTPRequestOperation 的blob / development / Code / Network / RKHTTPRequestOperation.h？source = c> acceptableContentTypes ，它是零！所以我假设RestKit只是放置自己的默认可接受的内容类型..我只是不知道在哪里以及如何防止它。想法？

digging into the subject.. i put a break point in managedObjectRequestOperationWithRequest, then I checked the acceptableContentTypes of HTTPRequestOperation created, and it's nil! So i'm assuming that RestKit is just putting its own default acceptable content types.. i just don't know where and how to prevent it. ideas?

ps 我无法控制服务器，所以我无法更改它的 content-type 标题为 application / JSON

p.s. I don't have control over the server, so I can't change it's content-type header to application/JSON

更新：

事实证明，在 RKObjectRequestOperation.m 从获取 mime-type [RKMIMETypeSerialization registeredMIMETypes] ; （第354行）..以及 RKMIMETypeSerialization.h 有方法：

It turns out that in RKObjectRequestOperation.m it gets the mime-type from [RKMIMETypeSerialization registeredMIMETypes];(line 354).. and so in RKMIMETypeSerialization.hthere is the method:

/**
 Registers the given serialization class to handle content for the given MIME Type identifier.

 MIME Types may be given as either a string or as a regular expression that matches the MIME Types for which the given serialization should handle. Serializations are searched in the reverse order of their registration. If a registration is made for an already registered MIME Type, the new registration will take precedence.

 @param serializationClass The class conforming to the RKSerialization protocol to be registered as handling the given MIME Type.
 @param MIMETypeStringOrRegularExpression A string or regular expression specifying the MIME Type(s) that given serialization implementation is to be registered as handling.
 */
+ (void)registerClass:(Class<RKSerialization>)serializationClass forMIMEType:(id)MIMETypeStringOrRegularExpression;

我如何使用它来注册 text / html content-type？

how do I use this to register a text/html content-type?

推荐答案

RestKit通常需要一个MIMEType（JSON）作为其响应数据。但是，您可以使用您找到的方法告诉它处理其他类型，如 text / plain 和 text / html 根据我的经验，它非常方便。将此添加到我的RestKit配置（我在我的应用程序委托中执行）允许我接受 application / json 和 text / html 作为响应数据内容类型。

RestKit generally expects a single MIMEType (JSON) for its response data. However, you can tell it to handle other types like text/plain and text/html using the method you found and in my experience it's been pretty handy. Adding this to my RestKit config (which I do in my app delegate) allows me to accept both application/json and text/html as response data content-types.

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

在我的情况下，这也很有用，因为泽西岛 - 我公司的后端团队的Web服务框架uses - 将空有效负载的内容类型默认为 text / plain ，除非我专门为该MIMEType注册，否则会触发失败块。

In my case, this is also helpful because Jersey - the web services framework the backend team at my company uses - defaults the content-type of empty payloads to text/plain, which triggers failure blocks unless I've specifically registered for that MIMEType.

希望这会有所帮助。

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