Closing web socket results in exception

[dgr]

When I go to close the web socket, I sometimes get an exception of the following form. It doesn't seem to happen every time and I can't tell what is triggering it. My only thought is that perhaps the other side closed the socket first, but I don't know why that would be the case and I'm not sure there is a way to detect it (at least with the Hato API; perhaps with the underlying JDK API). Oddly, from the stack trace, it looks like the code is trying to write to the socket and that's resulting in a "broken pipe." Finally, note that this does get reported through the :on-error handler.

#error {
 :cause Broken pipe
 :via
 [{:type java.io.IOException
   :message Broken pipe
   :at [sun.nio.ch.SocketDispatcher writev0 SocketDispatcher.java -2]}]
 :trace
 [[sun.nio.ch.SocketDispatcher writev0 SocketDispatcher.java -2]
  [sun.nio.ch.SocketDispatcher writev SocketDispatcher.java 66]
  [sun.nio.ch.IOUtil write IOUtil.java 227]
  [sun.nio.ch.IOUtil write IOUtil.java 158]
  [sun.nio.ch.SocketChannelImpl write SocketChannelImpl.java 574]
  [java.nio.channels.SocketChannel write SocketChannel.java 660]
  [jdk.internal.net.http.SocketTube writeAvailable SocketTube.java 1244]
  [jdk.internal.net.http.SocketTube$InternalWriteSubscriber tryFlushCurrent SocketTube.java 354]
  [jdk.internal.net.http.SocketTube$InternalWriteSubscriber onNext SocketTube.java 317]
  [jdk.internal.net.http.SocketTube onNext SocketTube.java 135]
  [jdk.internal.net.http.SocketTube onNext SocketTube.java 58]
  [jdk.internal.net.http.common.SubscriberWrapper$DownstreamPusher run1 SubscriberWrapper.java 316]
  [jdk.internal.net.http.common.SubscriberWrapper$DownstreamPusher run SubscriberWrapper.java 259]
  [jdk.internal.net.http.common.SequentialScheduler$LockingRestartableTask run SequentialScheduler.java 182]
  [jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask run SequentialScheduler.java 149]
  [jdk.internal.net.http.common.SequentialScheduler$SchedulableTask run SequentialScheduler.java 207]
  [jdk.internal.net.http.common.SequentialScheduler runOrSchedule SequentialScheduler.java 280]
  [jdk.internal.net.http.common.SequentialScheduler runOrSchedule SequentialScheduler.java 233]
  [jdk.internal.net.http.common.SubscriberWrapper outgoing SubscriberWrapper.java 232]
  [jdk.internal.net.http.common.SubscriberWrapper outgoing SubscriberWrapper.java 198]
  [jdk.internal.net.http.common.SSLFlowDelegate$Writer sendResultBytes SSLFlowDelegate.java 962]
  [jdk.internal.net.http.common.SSLFlowDelegate$Writer processData SSLFlowDelegate.java 845]
  [jdk.internal.net.http.common.SSLFlowDelegate$Writer$WriterDownstreamPusher run SSLFlowDelegate.java 721]
  [jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask run SequentialScheduler.java 149]
  [jdk.internal.net.http.common.SequentialScheduler$SchedulableTask run SequentialScheduler.java 207]
  [jdk.internal.net.http.common.SequentialScheduler runOrSchedule SequentialScheduler.java 280]
  [jdk.internal.net.http.common.SequentialScheduler runOrSchedule SequentialScheduler.java 233]
  [jdk.internal.net.http.common.SSLFlowDelegate$Writer incoming SSLFlowDelegate.java 745]
  [jdk.internal.net.http.common.SubscriberWrapper incomingCaller SubscriberWrapper.java 438]
  [jdk.internal.net.http.common.SubscriberWrapper onNext SubscriberWrapper.java 379]
  [jdk.internal.net.http.common.SubscriberWrapper onNext SubscriberWrapper.java 57]
  [jdk.internal.net.http.common.SSLTube onNext SSLTube.java 662]
  [jdk.internal.net.http.common.SSLTube onNext SSLTube.java 68]
  [jdk.internal.net.http.RawChannelTube write RawChannelTube.java 356]
  [jdk.internal.net.http.websocket.TransportImpl write TransportImpl.java 114]
  [jdk.internal.net.http.websocket.TransportImpl$SendTask tryCompleteWrite TransportImpl.java 607]
  [jdk.internal.net.http.websocket.TransportImpl$SendTask run TransportImpl.java 557]
  [jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask run SequentialScheduler.java 149]
  [jdk.internal.net.http.common.SequentialScheduler$SchedulableTask run SequentialScheduler.java 207]
  [jdk.internal.net.http.common.SequentialScheduler runOrSchedule SequentialScheduler.java 280]
  [jdk.internal.net.http.common.SequentialScheduler runOrSchedule SequentialScheduler.java 233]
  [jdk.internal.net.http.websocket.TransportImpl sendClose TransportImpl.java 271]
  [jdk.internal.net.http.websocket.WebSocketImpl sendClose0 WebSocketImpl.java 345]
  [jdk.internal.net.http.websocket.WebSocketImpl sendClose WebSocketImpl.java 315]
  [hato.websocket$close_BANG_ invokeStatic websocket.clj 153]
  [hato.websocket$close_BANG_ invoke websocket.clj 147]
  [hato.websocket$close_BANG_ invokeStatic websocket.clj 151]
  [hato.websocket$close_BANG_ invoke websocket.clj 147]
... application stack frames...
}