VS2019 allows us to create stateless services on .net core 3. I was not able to find any sample codes on this. How can we enable inter-service communication (.net core 3 gateway communicating with stateless service)?
As far as I know, the reverse proxy or remoting is not implemented yet. What's the best approach for communication and load balance?
The implementation in .net core 3 shouldn't be any different than what you were using previously.
If you're using specific ports, you can just call http://localhost:<portNumber>.
If you want to dynamically resolve the service (which would imply that your port is system-assigned and not dev-assigned), an interesting read is here:
https://dzimchuk.net/implementing-a-rest-client-for-internal-communication-in-service-fabric/
You could construct the service fabric reverse proxy uri yourself too, if you know which service you want to call.