Yes, that's it!

The methods generated in the “impl” class must return a %DynamicObject.  I think %WriteResponse accepts string, stream or %DynamicObject as parameters, but the most common usage is still %DynamicObject (The developer will always be free to modify according to his implementation) .  I'll put an issue on github for follow-up and fix it.  

edit: done in version 1.1.1

Great!
Probably an oversight in the return type when generating the code.  
I'll take a look.

Hi @Evgeny Shvarov !

I've just seen your message, I'll try to rebuild this project tomorrow, as I haven't had the opportunity to use it for a while.  I'm sure I've got a simple specification to test somewhere.

If you want, you can send me your specification by private message (discord) and I'll test it :)