This example shows how to integrate a Flask application into a custom Gunicorn server by subclassing `gunicorn.app.base.BaseApplication`. It defines a Flask app with a single `/` route that renders `index.html`, then passes that app to a `StandaloneApplication` class, which overrides `load_config` and `load` to apply runtime options. The server binds to `127.0.0.1:8080` and sets the worker count using `multiprocessing.cpu_count()`. The code demonstrates the required structure for launching Flask via Gunicorn’s custom WSGI interface, relying on the `gunicorn.six.iteritems` helper for configuration handling.