For a Sprite URL with url_settings.auth = sprite, we send Authorization: Bearer <org token> to https://<sprite>-<org>.sprites.app/.
After the edge authenticates the request, is Authorization stripped before the request is proxied to the HTTP service (e.g. port 3000)?
Can application code (getRequestHeader('authorization') / raw Node headers) ever see that org token? Is this guaranteed, or an implementation detail that might change?