Http applet logging

In an http applet, how do I do logging…

I would like to be able to do

   core.Info

to log a header value

core.register_service(“abuse_ip”, “http”, function (applet)
local response = “Access forbidden. Reason code 2.”

applet:set_status(403)
applet:start_response()
applet:send(response)

end)