From their [docs](http://flask-restful.readthedocs.org/en/latest/quickstart.html#resourceful-routing) it looks like you don't need to use `make_response(...)`.

You only need to return the response dictionary, or the dictionary and a status code.
```python
def get(self, foo):
    return { 'hello': 'world' }

...

def get(self, foo):
    return { 'hello': 'world' }, 404
```