Rrd4j REST API presistence request fails

Add-ons Persistence Services
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Hi,
I’m trying to access persistence data via the REST API.

While http://IP:PORT/rest/items/ITEM/state' is working great, the following two persistence calls are both failing with a 404 error:

  • http://IP:PORT/rest/persistence/rrd4j/ITEMNAME
  • http://IP:PORT/rest/persistence/ITEMNAME?servicename=rrd4j

Further I assume that persistence is working properly, because OH2 is showing the concerned ITEM data in a chart and I checked the data with the RrdInspector.

Any ideas? Thanks