A Docker example, running a Flask server on localhost:8080. Echoes the url path.
Usage:
docker build -t hello-server .
docker run -p 8080:1234 hello-server
Inside the container, hello_server.py runs a Flask server on the virtual port 1234, which Docker routes to the real port 8080
with the -p 8080:1234 argument. If you were to go to localhost:8080/foo/bar while the docker container is running, you will receive
a text page with Hello, foo/bar as the body.