Unfiltered kit for detecting Forwarded Proto and setting secure flag

SecureKit.scala

package unfilteredx.kit

import unfiltered.request._
import unfiltered.response._

object Secure {
  def secure[A,B](intent: unfiltered.Cycle.Intent[A,B]): unfiltered.Cycle.Intent[A,B] = {
    case req@ForwardedProto(proto) if (intent.isDefinedAt(req)) => intent(wrap(req, proto.toLowerCase))
    case req if (intent.isDefinedAt(req)) => intent(req)
  }
  
  private def wrap[A](req: HttpRequest[A], proto: String) = new DelegatingRequest(req) {
    override def isSecure = "https" == proto
    override def protocol = proto
  }
}

object ForwardedProto extends StringHeader("Forwarded-Proto")

SecureKitFilter.scala

package unfilteredx.kit

import unfiltered.request._
import unfiltered.response._
import unfiltered.filter._
import javax.servlet._
import javax.servlet.http._

object SecureFilter {
  type Req = HttpServletRequest
  type Res = HttpServletResponse
  
  def secure(intent: unfiltered.Cycle.Intent[Req,Res]): unfiltered.Cycle.Intent[Req,Res] = {
    case req@ForwardedProto(proto) if (intent.isDefinedAt(req)) => intent(wrap(req, proto.toLowerCase))
    case req if (intent.isDefinedAt(req)) => intent(req)
  }
  
  private def wrap[A](req: HttpRequest[Req], proto: String) = new RequestBinding(new HttpServletRequestWrapper(req.underlying) {
    override def getScheme = proto
    override def isSecure = proto == "https"
  })
}

object ForwardedProto extends StringHeader("Forwarded-Proto")