Invalid url in query request in SimpleJSON Datasource

I created new simplejson datasource (v1.4.0) setting as url and Server as access in Grafana 5.3.5.
The url is accessed when test and save the datasource.
When I create a new pannel I can see the timeseries and I also see the request in the REST API server side, but I can’t see any data in the graph.
I checked the query inspector and I see url:“api/datasources/proxy/2/query” instead of url:“”. The response is “Could not find a matching route”.

Any clue what I’m doing wrong?

It expects the /search bu default so when you pass “” it adds /search after the query by default that does not exists.