update: use nginx http2 directive

[tetuaoro]

Hi,

In this PR, I've updated the nginx config to follow nginx's recommendations and remove warnings when running the nginx -t command.

Changes

• removed the http2 directive from the listen instructions for ports 443
• added the http2 on; directive to explicitly enable HTTP/2.

Note

To fully eliminate the warnings, it is essential that all nginx config files follow this same recommendation, including any custom configurations.

Warn log

nginx: [warn] the "listen ... http2" directive is deprecated, use the "http2" directive instead in /etc/nginx/sites-enabled/domain.name:14

[dms00]

lgtm

[JoshData]

The documentation says "This directive appeared in version 1.25.1." and my nginx is 1.18.0.

[tetuaoro]

The documentation says "This directive appeared in version 1.25.1." and my nginx is 1.18.0.

Hi, when you say "my", do you mean MailInABox or your server ?

Yeah my server update nginx all the time.

[JoshData]

My live Mail-in-a-Box. I would expect all Mail-in-a-Box instances to have the same version. And since it's prior to 1.25.1, the http2 directive is not yet available.