Add instructions for testing that container works without internet access.

README.md

@@ -52,6 +52,15 @@ make docker-run
 
 The Docker container also runs the server at `http://127.0.0.1:8000`.
 
+## Test that your container works without Internet access
+Your submission will run without access to the Internet. You can test that your container starts successfully without Internet access by setting `--network none` in your `docker run` command:
+
+```bash
+make docker-test-no-internet
+```
+
+Note that this won't catch Internet access that happens in your `/predict` endpoint.
+
 
 ## What Happens When You Start the Server
 
@@ -93,6 +102,32 @@ Example response:
 }
 ```
 
+## Testing `/predict` without Internet access
+
+If you run your Docker container with `--network none` (for example, via `make docker-test-no-internet`), you can't make HTTP requests to it from outside. To test how your system functions without Internet access, you must first `exec` into the container:
+
+```bash
+# In one terminal, start the container
+make docker-test-no-internet
+```
+
+```bash
+# In a second terminal, exec into the container
+docker ps
+
+<note the name of your container>
+
+docker exec -it <container name> /bin/bash
+```
+
+Inside the container, you can make requests via Python:
+```
+root@cff6d5fdb23c:/app# python
+>>> import requests
+>>> requests.post("http://localhost:8000/predict", headers={"Content-Type": "application/json"}, data=...)
+```
+
+Replace the `...` with a real JSON request, such as the one generated by the `prompt.sh` script.
 
 # How to participate
 

makefile

@@ -25,6 +25,10 @@ docker-build:
 docker-run:
 	docker run --rm -it -p 8000:8000 $(IMAGE)
 
+.PHONY: docker-test-no-internet
+docker-test-no-internet:
+	docker run --rm -it --network none $(IMAGE)
+
 .PHONY: compile
 compile:
 	uv pip compile --python-version 3.12 --upgrade -o requirements.torch.cpu.txt.tmp requirements.torch.cpu.in