akka.stream.BufferOverflowException: Exceeded configured max-open-requests value of [32]. This means that the request queue of this pool (HostConnectionPoolSetup(127.0.0.1,46657,ConnectionPoolSetup(ConnectionPoolSettings(4,0,5,32,1,100 milliseconds,2 minutes,30 seconds,ClientConnectionSettings(Some(User-Agent: akka-http/10.1.7),10 seconds,1 minute,512,None,WebSocketSettings(<function0>,ping,Duration.Inf,akka.http.impl.settings.WebSocketSettingsImpl$$$Lambda$641/1432130400@615f3b62),List(),ParserSettings(2048,16,64,64,8192,64,8388608,8388608,256,1048576,Strict,RFC6265,true,Set(),Full,Error,Map(If-Range -> 0, If-Modified-Since -> 0, If-Unmodified-Since -> 0, default -> 12, Content-MD5 -> 0, Date -> 0, If-Match -> 0, If-None-Match -> 0, User-Agent -> 32),false,true,akka.util.ConstantFun$$$Lambda$494/487315055@661c18d6,akka.util.ConstantFun$$$Lambda$494/487315055@661c18d6,akka.util.ConstantFun$$$Lambda$495/525961447@7e80bb5c),None,TCPTransport),New,1 second),akka.http.scaladsl.HttpConnectionContext$@22917d89,akka.event.MarkerLoggingAdapter@538e5311))) has completely filled up because the pool currently does not process requests fast enough to handle the incoming request load. Please retry the request later. See http://doc.akka.io/docs/akka-http/current/scala/http/client-side/pool-overflow.html for more information.
at akka.http.impl.engine.client.PoolInterfaceActor.<init>(PoolInterfaceActor.scala:88)
at akka.http.impl.engine.client.PoolInterfaceActor$.$anonfun$props$1(PoolInterfaceActor.scala:34)
at akka.actor.TypedCreatorFunctionConsumer.produce(IndirectActorProducer.scala:87)
at akka.actor.Props.newActor(Props.scala:212)
at akka.actor.ActorCell.newActor(ActorCell.scala:624)
at akka.actor.ActorCell.create(ActorCell.scala:650)
at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:523)
at akka.actor.ActorCell.systemInvoke(ActorCell.scala:545)
at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:283)
at akka.dispatch.Mailbox.run(Mailbox.scala:224)
at akka.dispatch.Mailbox.exec(Mailbox.scala:235)
at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
This is the error: