akkaHttp http 请求抛出 UnexpectedConnectionClosureException: The http server closed the connection

Question

我正在尝试使用以下流程流式传输请求，我收到带有任何 uri 的响应：

UnexpectedConnectionClosureException: The http server closed the connection unexpectedly before delivering responses for 1 outstanding requests

这是我的流程的样子：

  val responseFuture: Future[HttpResponse] =
          Source.single(HttpRequest(
//fails for any uri
            uri = "http://localhost:9090/xstreams/v1/offset/getOffset?appId=local-1543580292487&sourceName=mysql")
          )
            .via(connectionFlow)
            .runWith(Sink.head)

此流程因任何 uri 而失败，我做错了什么？？？