为什么 RestKit 改变我的响应内容类型？

简而言之：我尝试使用以下命令从服务器获取数据content-typehttp请求头设置为@"text/html..但由于某种原因 RestKit 将其更改为application/JSON

解释：如果我只使用AF网络 https://github.com/AFNetworking/AFNetworking..一切都很顺利..这就是我的 AFNetworking 代码：

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];

如果我用那个完全相同的客户并将其附加到

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

深入研究主题..我在其中设置了一个断点托管对象请求操作与请求 https://github.com/RestKit/RestKit/blob/development/Code/Network/RKObjectManager.m?source=c，然后我检查了可接受的内容类型 https://github.com/RestKit/RestKit/blob/development/Code/Network/RKHTTPRequestOperation.h?source=c of HTTPRequestOperation创建了，它是零！所以我假设 RestKit 只是放置它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阻止它。想法？

p.s.我无法控制服务器，所以我无法更改它content-type标头至application/JSON

Update:

事实证明，在RKObjectRequestOperation.m https://github.com/RestKit/RestKit/blob/development/Code/Network/RKObjectRequestOperation.m?source=c它得到mime-type from [RKMIMETypeSerialization registeredMIMETypes];（第354行）..等等RKMIMETypeSerialization.h https://github.com/RestKit/RestKit/blob/development/Code/Support/RKMIMETypeSerialization.h?source=cc有一个方法：

/**
 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内容类型？

RestKit 通常期望其响应数据使用单个 MIMEType (JSON)。但是，您可以告诉它处理其他类型，例如text/plain and text/html使用您找到的方法，根据我的经验，它非常方便。将其添加到我的 RestKit 配置中（我在应用程序委托中执行此操作）允许我接受两者application/json and text/html作为响应数据内容类型。

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

就我而言，这也很有帮助，因为 Jersey（我公司后端团队使用的 Web 服务框架）将空负载的内容类型默认为text/plain，除非我专门注册了该 MIMEType，否则它会触发失败块。

希望这可以帮助。