AFNetworking 报错JSON text did not start with array or object and option to allow fragments not set…

AFNetworking默认把响应结果当成JSON来处理

manager.responseSerializer = [AFJSONResponseSerializer serializer]

如果返回的并不是一个JSON，而是一个html网页，AFNetworking就会报这个错误

解决方案：

将responseSerializer改为[AFHTTPResponseSerializer serializer];

 manager.responseSerializer = [AFHTTPResponseSerializer serializer];