CORS issue from localhost (per example) when running online (azure)

[de-peter]

using a web project with vite

resolve: {
alias: [
{ find: "react", replacement: "https://<myserver.de>/react@latest" },
{ find: "react-dom", replacement: "https://<myserver.de>/react-dom@latest" },
]
}

and getting this error:
Access to script at 'https://<myserver.de>/react@latest' from origin 'http://localhost:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

server config:
"corsAllowOrigins": [],

also tried:
"corsAllowOrigins": [ "http://localhost:8080" ],