def index(path=None):
    """On all other routes, just return an example `curl` command."""
    payload = {
        "username": "soandso",
        "message": "Hello bot",
        "vars": {
            "name": "Soandso",
        }
    }
    return Response(r"""Usage: curl -i \
    -H "Content-Type: application/json" \
    -X POST -d '{}' \
    http://localhost:5000/reply""".format(json.dumps(payload)),
    mimetype="text/plain")
On all other routes, just return an example `curl` command.