Exact ça a bien fonctionné  
 
local http = net.HTTPClient()
http:request("https://maker.ifttt.com/trigger/TRIGGER_HC2/json/with/key/VOTRE_CLEF_IFTT_MAKER",{
	success = function(response)
		if response.status == 200 then
			print('OK, réponse : '.. response.data)
		else
			print("Erreur : status=" .. tostring(response.status))
		end
	end,
	error = function(err)
		print("Erreur : " .. err)
	end,
	options = {
		method = 'GET'
	}
})