CORS.md How do I implement "Allow users to request from all origins"? Major frameworks's implementation is following. dojango: use * https://github.com/adamchainz/django-cors-headers/blob/8484b2addc72665770872bebfc9cbaed8d041768/src/corsheaders/middleware.py#L151-L154 rails/rack: use * https://github.com/cyu/rack-cors/blob/b718a196cfe8daeeffbe5228d6878a28f7a0b6ac/lib/rack/cors/resource.rb#L63-L79