[fix] Allow close code 1014 (#1682)

IANA has assigned 1014 as "Bad Gateway".

Refs: https://www.iana.org/assignments/websocket/websocket.xhtml#close-code-number
Refs: https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent

Ben Falconer authored Luigi Pinca committed

Nothing here #2334.3 passed

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