That’s right. Slash was made for that. But the focus of Slash is GraphQL. Dgraph’s GraphQL feature is an automated GraphQL server. Based on your schema. But it is only for the GraphQL case. Not DQL.
If you gonna use DQL.
Okay, now we are talking 
- It just works. BTW If you wanna some remote thing on your self-generated GraphQL server in Slash, you can add Lambda functions.
But even tho, Dgraph can’t connect to third-party applications out of the blue. We have some third-party applications support coming, things like Kafka. But it isn’t a universal thing(support any third-party application). Lambda can be a way out for you.