Play Https filter for Heroku

HttpsFilter

object HttpsFilter extends Filter {

  def isHttpsRequest(request : RequestHeader) =
    Play.isDev || request.headers.get("x-forwarded-proto").exists(_.contains("https"))

  override def apply(next: (RequestHeader) => Future[SimpleResult])(request: RequestHeader): Future[SimpleResult] = {
    if (isHttpsRequest(request))
      next(request)
    else
      Future.successful(Results.Redirect("https://"+ request.host + request.uri, request.queryString))
  }
}