# init HTTP headers for Neo4j REST API
	protected fun init_headers do
		headers = new HeaderMap
		headers["Accept"] = "application/json; charset=UTF-8"
		headers["Transfer-Encoding"] = "chunked"
		headers["X-Stream"] = "true"
		if auth != null then
			headers["Authorization"] = "token {auth.to_s}"
		end

		# User agent (is used by github to contact devs in case of problems)
		if user_agent != null then
			headers["User-Agent"] = user_agent.to_s
		end
	end