unfiltered responsefunction for detecting heroku https

HerokuRedirect.scala

object HerokuRedirect {
  def apply[A, B](req: HttpRequest[A], path: String): ResponseFunction[B] = {
     val absolutepath = if (path.startsWith("/")) path else "/" + path
     req match {
        case XForwardProto("https") & Host(host) => Found ~> Location("https://%s%s".format(host, absolutepath))
        case _ => Redirect(path)
     }
  object XForwardProto extends StringHeader("X-Forward-Proto")
}