reverseproxy: Use correct cases for websocket related headers #6621
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Fix https://caddy.community/t/websockets-fail-venus-os-cerbo-gx-victron/25685
Although websocket related headers should be handled case insensitively. Some legacy servers and clients do handle them strictly according to rfc. traefik handles this case too. Popular golang websocket libraries such as gorilla also use the correct case.