scala – Spray不会将我的case类转换为json并期望一个spray.http

首先,这是我的依赖项：

compile 'io.spray:spray-can_2.11:1.3.1'
compile 'io.spray:spray-routing_2.11:1.3.1',compile 'io.spray:spray-json_2.11:1.2.6'

现在我要做的是：

class WHttpService extends Actor with HttpService with ActorLogging {

  implicit def actorRefFactory = context

  def receive = runRoute(route)

  lazy val route = logRequest(showReq _) {
    // Way too much imports but I tried all I could find
    import spray.json._
    import DefaultJsonProtocol._
    import MasterJsonProtocol._
    import spray.httpx.SprayJsonSupport._
    path("server" / Segment / DoubleNumber / DoubleNumber) { (login,first,second) =>
      get {
          complete {
            Answer(1,"test")
          }
      }
    }
  }

  private def showReq(req : HttpRequest) = LogEntry(req.uri,InfoLevel)
}

附：

case object MasterJsonProtocol extends DefaultJsonProtocol with SprayJsonSupport {
  import spray.json._

  case class Answer(code: Int,content: String)
  implicit val anwserFormat: JsonFormat[Answer] = jsonFormat2(Answer)
}

现在我收到此错误：

Error:(42,19) type mismatch;
 found   : MasterJsonProtocol.Answer
 required: spray.httpx.marshalling.ToResponseMarshallable
            Answer(1,"test")
                  ^

我尝试了很多东西,但无法使其成功.
我试过了

Answer(1,"test").toJson
Answer(1,"test").toJson.asJsObject

最后我做的是

complete {
    Answer(1,"test").toJson.compactPrint
}

这有效,但当我需要application / json时,它会以Content-Type：text / plain的形式发送给客户端.

有人看到这里的问题是什么？

编辑：我在github https://github.com/ydemartino/spray-test上添加了一个示例项目