AFNetworking配置网络请求

问题 ：code = -1016 

解决方法：配置对应的content-Type类型 ；

问题 ：Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow
fragments not set.}

解决方法：配置manger.responseSerializer = [AFHTTPResponseSerializer serializer] ;