Arvados

In the course of looking at #20449, it doesn't seem like workbench is receiving any events from websockets. It seems to be receiving a once-per-minute empty ping, but not any actual events.

I think this explains why most of the time the continuous-reloading behavior described in #20449 doesn't actually happen. (But sometimes it does, which means sometimes websockets works?)

We should either fix it or abandon it entirely and rely on polling.