[Request]: nginx $host variable explanation is unclear about HTTP/2,3 behaviour #1431
Description
What would you like the documentation team to work on?
https://nginx.org/en/docs/http/ngx_http_core_module.html#var_host is explained thus:
in this order of precedence: host name from the request line, or host name from the “Host” request header field, or the server name matching a request
Ref: https://github.com/nginx/nginx.org/blob/main/xml/en/docs/http/ngx_http_core_module.xml#L3189
As HTTP/3 does not have a conventional request line or request headers, I am unsure if the HTTP/2 or HTTP/3 :authority field will be used to populate $host.
Additional clarity here would help to avoid people using $http_host in dangerous/unpredictable ways.
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