fix(ws): close existing connections #13531
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Close all existing websocket connections to ensure a graceful shutdown.
PR Checklist
Please check if your PR fulfills the following requirements:
PR Type
What kind of change does this PR introduce?
What is the current behavior?
Issue Number: closes #13534
Existing connections are not closed automatically, according to https://github.com/websockets/ws/blob/master/doc/ws.md#serverclosecallback.
Application shutdown hangs when shutdown hooks are enabled and there are existing websocket connections. This is because the server.close callback that is awaited only resolves after all connections are closed. This is the call chain:
What is the new behavior?
All existing websocket connections are closed to ensure a graceful shutdown.
Does this PR introduce a breaking change?
Other information