[akka-http] The http server closed the connection unexpectedly before delivering responses for 1 outstanding requests

I have 2 containers, using docker command --net host , the akka application in a container, makes request to another container(a file server using nginx) .

The error information is:

akka.http.impl.engine.client.OutgoingConnectionBlueprint$.$anonfun$apply$6(OutgoingConnectionBlueprint.scala:123)
akka.http.impl.engine.client.OutgoingConnectionBlueprint$.$anonfun$apply$6$adapted(OutgoingConnectionBlueprint.scala:123)
akka.http.impl.util.One2OneBidiFlow$One2OneBidi$$anon$1$$anon$4.onUpstreamFinish(One2OneBidiFlow.scala:97)
akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:523)
akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:390)
akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:625)
akka.stream.impl.fusing.GraphInterpreterShell$AsyncInput.execute(ActorGraphInterpreter.scala:502)
akka.stream.impl.fusing.GraphInterpreterShell.processEvent(ActorGraphInterpreter.scala:600)
akka.stream.impl.fusing.ActorGraphInterpreter.akka$stream$impl$fusing$ActorGraphInterpreter$$processEvent(ActorGraphInterpreter.scala:769)
akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:784)
akka.actor.Actor.aroundReceive(Actor.scala:535)
akka.actor.Actor.aroundReceive$(Actor.scala:533)
akka.stream.impl.fusing.ActorGraphInterpreter.aroundReceive(ActorGraphInterpreter.scala:691)
akka.actor.ActorCell.receiveMessage(ActorCell.scala:575)
akka.actor.ActorCell.invoke(ActorCell.scala:545)
akka.dispatch.Mailbox.processMailbox(Mailbox.scala:270)
akka.dispatch.Mailbox.run(Mailbox.scala:231)
akka.dispatch.Mailbox.exec(Mailbox.scala:243)
java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

akkaVersion = "2.6.5"
akkaHttpVersion = "10.1.12"

config:

akka {
    http {
      host-connection-pool {
        max-connections = 1024
        min-connections = 1024
        max-open-requests = 16384
      }
    }
  }

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