Play 2.5 HTTPS redirection on Clever Cloud

application.conf

play.http.forwarded.version="x-forwarded"
play.http.forwarded.trustedProxies=["0.0.0.0","::"]
play.http.filters=controllers.MyFilters

Filters.scala

package controllers

import javax.inject._
import play.api._
import play.api.http.DefaultHttpFilters
import play.api.mvc._
import play.api.Environment
import scala.concurrent.{ExecutionContext, Future}
import akka.stream.Materializer

class TLSFilter @Inject() (
  implicit val mat: Materializer, ec: ExecutionContext, env: Environment
) extends Filter {
  def apply(nextFilter: RequestHeader => Future[Result])(requestHeader: RequestHeader): Future[Result] = {
    if(requestHeader.headers.get("X-Forwarded-Proto").getOrElse("http") != "https" && env.mode == play.api.Mode.Prod)
      Future.successful(Results.MovedPermanently("https://" + requestHeader.host + requestHeader.uri))
    else
      nextFilter(requestHeader).map(_.withHeaders("Strict-Transport-Security" -> "max-age=31536000"))
  }
}

class MyFilters @Inject() (
  tls: TLSFilter
) extends DefaultHttpFilters(tls)