Client - Server model using Dart as Client and Go language as Server

I am trying to understand google two programing language.

Dart --> Produce Javascript

Go --> Produce machine code

If I need to combine Client - Server model. I am wondering how the architecture works.

How does it work. Is there any example/sample.

Example : Please explain this.....

I type www.learnlang.com. I expect WEB UI is served using Dart and It is calling REST API developed in GO language.

Note : Please don't relate google app engine. I am trying to understand the model in individual servers.

Thank you.