akka bug?

akkabug.scala

/*
name := "bug"
 
version := "1.0"
 
organization := "com.github.longshorej"
 
libraryDependencies ++= Seq(
  "com.typesafe.akka" %% "akka-http-experimental" % "1.0"
)
 
scalaVersion := "2.11.7"
*/

package com.github.longshorej

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.server._
import akka.stream.ActorMaterializer
import akka.http.scaladsl.marshalling.PredefinedToEntityMarshallers
import akka.http.scaladsl.model.MediaTypes

object Main extends App {
  implicit val as = ActorSystem()
  implicit val mat = ActorMaterializer()
  implicit val sm = PredefinedToEntityMarshallers.stringMarshaller(MediaTypes.`text/html`)

  val route =
    path("test") {
      get {
        complete("<form method='post' action='/test'><input type='text' name='test' /><input type='text' name='test2' /><input type='submit' />")
      } ~ post {
        formFields("test", "test2") { case (test, test2) => complete(s"got $test $test2") }
      }
    }


  val serverBinding = Http().bindAndHandle(route, "0.0.0.0", 8081)


  println("server listening on port 8081")
  println("press return to stop")
  Console.readLine()

  import as.dispatcher

  serverBinding
    .flatMap(_.unbind())
    .onComplete(_ => as.shutdown())
}