actix-web
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define behavior when multiple Connection header values are provided
see dicussion in comments of : https://github.com/actix/actix-web/discussions/2691#discussioncomment-2340435
in particular:
- what happens when receiving
close, upgrade - what happens when receiving
keep-alive, upgrade - other tricky combinations? TODO
References
RFC 6455 The request MUST contain a |Connection| header field whose value MUST include the "Upgrade" token.