404. That’s an error.

The requested URL /apis/chart/image/docs/chart_playground.html?url=http%3A%2F%2Fchart.googleapis.com%2Fchart%3Fcht%3Dgv%26chs%3D300x300%26chl%3Dgraph%7BA--B--ED%3BB--E%3BA--C--F--G%3BF--H%7D was not found on this server. That’s all we know.