private function serve_raw_and_die( $the_content_type, $the_content ) {
    header( 'Content-Type: ' . $the_content_type . '; charset=UTF-8' );

    global $wp_query;
    $wp_query->is_feed = true;
    set_query_var( 'feed', 'sitemap' );

    if ( '' === $the_content ) {
      $error = __( 'No sitemap found. Please try again later.', 'jetpack' );
      if ( current_user_can( 'manage_options' ) ) {
        $next = human_time_diff( wp_next_scheduled( 'jp_sitemap_cron_hook' ) );
        /* translators: %s is a human_time_diff until next sitemap generation. */
        $error = sprintf( __( 'No sitemap found. The system will try to build it again in %s.', 'jetpack' ), $next );
      }

      wp_die(
        esc_html( $error ),
        esc_html__( 'Sitemaps', 'jetpack' ),
        array(
          'response' => 404,
        )
      );
    }

    echo $the_content; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- All content created by Jetpack.

    die();
  }