I have been wondering about when ratel will support TLS connection. Right now it communicates with a database that is unsecured only and would therefore be a great feature.
Would love to know this as well. Ratel is very handy to experiment with queries, but I have to use a separate non-TLS dgraph alpha in order to use it.
Ratel + TLS is supported already and has been for a while.
Documentation is here: https://docs.dgraph.io/deploy/#using-ratel-ui-with-client-authentication