CORS

For backend servers, it's configured as part of actix.

For static media (including wasm), there is a script in frontend/build-utils. All that's needed is to npm run each of cors:frontend, cors:media, and cors:uploads

To configure the origins, see the respective *-cors.json file in the build-utils folder.

Since it runs gsutil, you may need to be careful to run it in a compatible shell (like cmd, not powershell, in windows)