E.g. in amici1 : go to the detail of to a calendar event, add a participants, then open the presences panel in own window and try to delete the participant. Doesn't work although it should. The Ajax call sent by the delete button forgets to add mt and mk. It says just GET

   127.0.0.1:8000/api/cal/...;fmt=json&rp=weak-key-4&sr=3