Passing current cookies in wp_remote_get to get Draft Post Preview

I rarely deal with cookies and not sure about complete mechanics there, but here is basic working example of passing current user’s cookies to retrieve preview page source:

$preview_link = set_url_scheme( get_permalink( $post->ID ) );
$preview_link = esc_url( apply_filters( 'preview_post_link', add_query_arg( 'preview', 'true', $preview_link ) ) );
$cookies      = array();

foreach ( $_COOKIE as $name => $value ) {
    $cookies[] = new WP_Http_Cookie( array( 'name' => $name, 'value' => $value ) );
}

$request = wp_remote_get( $preview_link, array( 'cookies' => $cookies ) );
$body    = wp_remote_retrieve_body( $request );