1. By decorating a function with [`webhook_endpoint`], a [`WebhooksServer`] object has been created in the background.
As you can see, this server is a Gradio app running on http://127.0.0.1:7860. If you open this URL in your browser, you
will see a landing page with instructions about the registered webhooks.
2. A Gradio app is a FastAPI server under the hood. A new POST route `/webhooks/trigger_training` has been added to it.