n0099 2b1d250154 nginx: Switch from $host to $http_host for HTTP/3 compatibility. ...

nginx sets the value of the `$http_host` variable to the empty string
when using http/3, as there is technically no `Host:` header sent:
https://github.com/nginx-quic/nginx-quic/issues/3

Users with a browser that support http/3 will send their first request
to nginx with http/2, and get an expected HTTP 200 -- but any
subsequent requests will fail with am HTTP 400, since the browser will
have upgraded to http/3, which has an empty `Host` header, which Zulip
rejects.

Switch to the `$host` variable, which works for all HTTP versions.

Co-authored-by: Alex Vandiver <alexmv@zulip.com>

2023-07-25 18:20:34 -04:00

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