Websockets - recommended settings question

[Cain]

Hi,

In the nginx documentation (https://www.nginx.com/blog/websocket-nginx), it
is recommended to set the 'Connection' header to 'close' (if there is no
upgrade header) - from my understanding, this disables keep alive from
nginx to the upstream - is there a reason for this?

Additionally, is keep alive the default behaviour when connecting to
upstreams?

Thanks
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