"GNU Terry Pratchett" Filter for Play Framework (Scala)

TerryPratchett.scala

object TerryPratchett extends EssentialFilter {

  def apply(nextFilter: EssentialAction) = new EssentialAction {
    def apply(requestHeader: RequestHeader) = {
      nextFilter(requestHeader).map { result =>
        // https://www.reddit.com/r/discworld/comments/2yt9j6/gnu_terry_pratchett
        result.withHeaders("X-Clacks-Overhead" -> "GNU Terry Pratchett")
      }
    }
  }

}