I need to add this to my header:
Access-Control-Allow-Origin: *
Not sure how to write that down in the Inside tag on page settings.
Any advice?
You can’t add that in Webflow, if you are having issue with CORS is something that you have to fix on the external server not in Webflow
The external server is youtube. Unfortunately I can’t fix it in their side.
Then you are probably doing something that you shouldn’t do, some interactions must be done server side not from the browser