WebSocket connection close before trying to connect

[paulhaem]

Hey, I am currently investigating following issue: After the sockjs client receives an "o" frame via web socket connection from the server the connection closes with code 1000 ("normal"). Shortly after sockjs initialises XHR-streaming. Tested with Firefox and Chrome. Chrome outputs only "WebSocket is closed before the connection is established.". When refreshing the page it seems like it randomly picks native WebSockets or XHR-streaming - similar to the description of this issue (#353). To me it sounds like a race condition.

[github-actions]

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