# Internal function that sets cURL options and request' parameters
	private fun prepare_request(callback_receiver: CurlCallbacks) : CURLCode
	do
		var err

		# cURL options and delegates
		err = set_curl_options
		if not err.is_ok then return err

		# Callbacks
		err = set_curl_callback(callback_receiver)
		if not err.is_ok then return err

		# HTTP Header
		err = set_curl_http_header
		if not err.is_ok then return err

		# Set HTTP method and body
		err = set_method
		if not err.is_ok then return err
		err = set_body

		return err
	end