I use a different URL in WP_CONTENT_URL and in WP_PLUGIN_URL as per the instructions. Those URLs are from a CDN network. So, when the CDN URL is entered in WP_PLUGIN_URL, I get the following error when visiting the sitemap (domainname.com/sitemap_index.xml) using a browser...
Error loading stylesheet: An unknown error has occurred (805303f4)
When I did
curl -I http://domainname.com/sitemap_index.xml, it works. Also, Google Webmaster Tools doesn't complain. So, the sitemap works correctly. But, it is not displayed correctly to normal visitors.
Is there anyway to exclude "wp-content/plugins/wordpress-seo/css/xml-sitemap-xsl.php" to serve from WP_PLUGIN_URL?
Thanks for any help.