# Intern perform method, lowest level of request launching
	private fun perform: nullable CurlResponseFailed
	do
		if not self.curl.is_ok then return answer_failure(0, "Curl instance is not correctly initialized")

		var err

		err = self.curl.native.easy_setopt(new CURLOption.verbose, self.verbose)
		if not err.is_ok then return answer_failure(err.to_i, err.to_s)

		err = self.curl.native.easy_perform
		if not err.is_ok then return answer_failure(err.to_i, err.to_s)

		return null
	end