how to add CDN images into Rank math sitemap

Hello,

Thank you for contacting the support, and sorry for any inconvenience that might have been caused due to that.

Please use this filter in your theme’s functions.php file to include your CDN URLs in the sitemap:

/**
 * Filter to Add CDN Image URLs in the Sitemap
 *
 * @param string $src  Image URL.
 * @param object $post Post object.
 */
add_filter( 'rank_math/sitemap/xml_img_src', function( $src, $post ){
	$src = str_replace( 'http://domain.com', 'https://cdn.domain.com', $src );
	return $src;
}, 10, 2);

Change the domain to your actual domain.

More of that here: https://rankmath.com/kb/filters-hooks-api-developer/#sitemap-cdn-urls

Let me know if it works on your end. Looking forward to helping you.

Hello,

The filter I shared does change the domain, but not for the sitemap URL but for the image URLs. You may check the guide added in the comments. https://rankmath.com/kb/filters-hooks-api-developer/#sitemap-cdn-urls

Could you please confirm if you have tried implementing the filter? If not yet, please do so and follow the steps below to refresh the entire sitemap:

1. Flush the Sitemap cache by following this video screencast:
https://i.rankmath.com/pipRDp

2. Exclude the Sitemap files of the Rank Math plugin in your caching plugin. The cache could be via a plugin or from the server. For plugins or Cloudflare, please follow this article:
https://rankmath.com/kb/exclude-sitemaps-from-caching/

Let us know how it goes. We are looking forward to helping you.