I have an issue that recently started happening. I am using the domain mapping feature and have never had issues with pulling images or resources from root multi site before.
this is in particular revolution slider svg image is not loading.
a few weeks ago I started getting this message.
in the browser console I see this
“access to xmlhttprequest at XXXX. from origin XXXX has been blocked by CORS policy: No ‘access-control-allow-origin’ header is present on the requested resource”
I have traced an answer to the htaccess file by adding script
Header set Access-Control-Allow-Origin “*”
but it seems its being appended right again by another header script underneith
I can also see it says its Hummingbird that is blocking the request header at the root multisite for domain mapped
Please check the attached screenshot