This is by design, as we want to decouple Ratel releases from Dgraph releases.
We’ve rolled out some bugs in the past, sorry about that. Working hard to only produce bug-free releases.
Easy way to disable the CDN is by appending ?cachedjs to the ratel URL. For example, I use http://localhost:8000/?cachedjs
IIRC this feature was NOT available in v1.0.5 and had some issues before v1.0.9. So you might have to upgrade dgraph if you need this. You can upgrade Ratel only, it should work fine with older servers.