Hi Vittorio,
The object you look at / inspect in debug mode is an implementation of HttpServeletResponse. This is specific to a server and varies across different servers. HttpServeletResponse defines state and behaviour that all other implementing servers have to abide by. So, you can access the state and behaviour of the Response using the fields / methods defined in this interface.
If the server is written in
java, you'll have to know the Class type of the response and typecast it to access 'MethodMB'. But I don't think this is ever needed or a recommended approach. Why do you need to access such values ?