一旦我触发对 JSON资源的请求,我就会得到以下信息： @H_403_2@The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=0x1d87a2c0 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

问题是我应该在哪里设置AFNetworking 2.0中的允许片段？

更新：

我的类是AFHTTPSessionManager的子类.我已经创建了一个JSONResponseSerializer,它也不起作用.

返回的JSON如下：

@H_403_2@[{"StoryId":1,"Title":"The big red dog","Abstract":"There was a big red dog and the dog was very big","IsFeatured":true}] -(instancetype) initWithBaseURL:(NSURL *)url { NSURL *base = [NSURL URLWithString:@"URL to the web service that returns the json"]; self = [super initWithBaseURL:base]; AFJSONResponseSerializer *responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments]; [self setResponseSerializer:responseSerializer]; return self; }

返回的错误如下：

@H_403_2@[0] (null) @"NSDebugDescription" : @"Invalid value around character 0."

来自WEB服务器的响应：

@H_403_2@[{"StoryId":1,"IsFeatured":true}]

来自WEB服务器的响应状态：

@H_403_2@HTTP/1.1 200 OK Server: Microsoft-IIS/7.0 X-Powered-By: ASP.NET Content-Type: application/json;charset=utf-8 X-AspNetMvc-Version: 3.0 Connection: close Date: Mon,28 Oct 2013 20:02:21 GMT Content-Length: 121 Cache-Control: private X-AspNet-Version: 4.0.30319 [{"StoryId":1,"IsFeatured":true}]