If you get this error:

[WebServer] Depricated RType (graph) for API request. Please use correct API Command!

I solved is by replacing:

local sQuery = 'curl "http://127.0.0.1:8080/json.htm?type=graph&sensor=temp&idx='..tostring(uitlees_idx)..'&range=day"'

with

local sQuery = 'curl "http://127 ...