Content negotiable resource doesn't work for twitter cards


#1

https://irail.be/stations/NMBS/008892007/departures/201408181337f981513987b0021407134a6383bc1f45

This page is content negotiable. The server prefers to give JSON though, so even no accept header has been set, it serves JSON.

When testing this page with the tool, it gives an internal error, probably because of the JSON that gets returned instead of the HTML which contains the twitter properties.