define behavior when multiple Connection header values are provided
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A-http
needs-investigation
- Dominant language
- Rust
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Description
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.
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