Caddyfile configuration for multiple Access-Control-Allow-Origin

Caddyfile

(cors) {
  @origin{args.0} header Origin {args.0}
  header @origin{args.0} Access-Control-Allow-Origin "{args.0}"
}

sub.domain.com {
  reverse_proxy 127.0.0.1:3000
  header Access-Control-Allow-Methods *
  header Access-Control-Allow-Headers content-type
  header Access-Control-Allow-Credentials true

  import cors https://www.domain1.com
  import cors https://www.dev.domain1.com
  import cors https://www.sand.domain1.com
  import cors https://www.stage.domain1.com

  import cors https://app.domain2.com
  import cors https://app.sand.domain2.com
  import cors https://app.stage.domain2.com
}