Changing Access-Control-Allow-Origin header from https to http

[nunomorgadinho]

After I enable the frontend I get:

GET https://s3-eu-central-1.amazonaws.com/myblogcomments-../comments.json 403 (Forbidden)

And when posting:

"Fetch API cannot load https://xxx.execute-api.eu-central-1.amazonaws.com/prod/comments. Response to preflight request doesn't pass access control check: The 'Access-Control-Allow-Origin' header has a value 'https://www.website.org' that is not equal to the supplied origin. Origin 'http://www.website.org' is therefore not allowed access. Have the server send the header with a valid value, or, if an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled."

I can't seem to be able to change from https to http, any hint on how to change it?