Are you sure you are using a native Docker installation? If not, you should try to get the machine’s (in general it is a hyper-v VM on Windows) IP. And access it via it’s IP. e.g: 192.168.99.1:8000
If it is a native installation, check your docker configs. Not sure how it works on Windows. In my mind, it should forward the port to the localhost automatically.
You can also do a test to check if the Ratel UI is really running.
Run:
docker ps
Get the container ID and then:
docker exec -it $ContainerID sh
So you gonna be inside the container. You can run:
curl localhost:8000
If you get a giant HTLM body in the response it means that it is running and the issue is related to Docker.
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Cheers.