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Fix race condition in WebSocketService #1021
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PR description
WebSocketService was accessing
httpServerfrom a handler that is setup as part of initinghttpServerso if the handler was called quickly it may fail with aNullPointerExceptionbecausehttpServerhasn't actually been assigned yet (or the assignment isn't visible to the other thread). ThehttpServervalue is available as the result passed into the handler anyway so use that instead.