dcaoyuan

        val uri = "http://www.yahoo.com"
        val reqEntity = Array[Byte]()

        val respEntity = for {
          request <- Marshal(reqEntity).to[RequestEntity]
          response <- Http().singleRequest(HttpRequest(method = HttpMethods.POST, uri = uri, entity = request))
          entity <- Unmarshal(response.entity).to[ByteString]
        } yield entity

        val payload = respEntity.andThen {