response.remove doesn't seem to work
`response.remove` as the docs say, can be used to remove the header from the response being sent, but it's not removing it as I've tried. `response.set` works though.


```        res.remove("X-Powered-By");```

<img width="234" alt="Screenshot 2019-09-11 at 09 44 18" src="https://user-images.githubusercontent.com/4329912/64667814-c05d1300-d478-11e9-89cb-53e01e5e2411.png">
