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Force http/1.1 for websocket #31
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This was referenced Nov 10, 2017
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related to: traefik/traefik#2280
websocket is in http/1.1 (https://github.com/gorilla/websocket/blob/71fa72d4842364bc5f74185f4161e0099ea3624a/client.go#L155)
If the backend server authorized http2, http2 was used for this http/1.1 request, that's why it failed.
https://daniel.haxx.se/blog/2016/06/15/no-websockets-over-http2/