Finagle 6.28.+で確認。ClientBuilderを使う方法は現在は古い方法になっている
どこかのサーバに問い合わせに行く処理。エラーが発生した時は例外を投げたりせずにNOT_FOUNDの結果を返す

def query(param:String) :Future[HttpResponse] = {
	val retVal = new Promice[HttpResponse]
	
	val client: Service[HttpRequest, HttpResponse] = ClientBuilder().codec(http.Http()).
      hostConnectionLimit(32).hosts("hoge.com:8080").        
      tcpConnectTimeout(100.milliseconds).timeout(50.milliseconds).build()
    val request = RequestBuilder.safeBuildGet(RequestBuilder.create().url(s"http://hoge.com:8080?url=${java.net.URLEncoder.encode(param, "UTF-8")}"))
 
 	val f1 = client(request).onSuccess{ f =>
      retVal.setValue(f)
    } onFailure { exc =>
      log.ifWarning(s"エラー発生: $param")
      val response = Response()
      response.setStatus(HttpResponseStatus.NOT_FOUND)
      retVal.setValue(response)
    }

    Await.ready(f1)
    retVal
}