Go-carbon - setting format for requests

I am trying to set up grafana with environment based on go-carbon with carbonserver enabled. I can make HTTP GET requests like ‘/metrics/find/?local=1&format=json&query=*’ and receive response, but when trying to set it up as data source I get in web ‘Unknown Error’. Also in the go-carbon logs I see:

[2017-03-24 13:32:56] I [carbonserver] dropping invalid uri (format=): /metrics/find/?query=*

Can I set format for the requests somehow in grafana? Do you know how to configure it properly?

Thank you for help.

Strange, there should not be a format param in that call. Looks like go-carbon is not graphite/graphite-api compatible.