ERROR: "WebSocket is already in CLOSING or CLOSED state" terminal timeout
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Description
I'm running notebooks in a docker container on a Dataproc cluster, and I find that the terminal is timing out after two minutes, regardless of activity. It just becomes unresponsive after two minutes, and if you go into the developer's console it says
```WebSocket is already in CLOSING or CLOSED state.```
Reloading the page resolves this, but then will time out again in another two minutes. I'm running jupyter notebook version 5.7.8 and tornado 4.5.3.
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