Nginx 1.25.1+ Listen … http2” directive is deprecated

[SIP-Online]

Just updated a server which upgraded nginx to 1.25.1
Warnings received on restart.
nginx: [warn] the "listen ... http2" directive is deprecated, use the "http2" directive instead

This will not break anything immediately, but just as a heads-up the old format is

server {
    listen 192.168.1.3:443 ssl http2;

And the new format for nginx >= 1.25.1 is

server {
    listen 192.168.1.3:443 ssl;
    http2 on;

[iliajie]

Hello,

Thanks for the heads up!

Nginx version 1.25.1 isn't available upstream yet. We will consider supporting it in the future though!

[SIP-Online]

Thanks for this quick response ! 👍
I forgot to mention that I use the Sury repository: https://packages.sury.org/nginx/

EDIT :
I just saw that HTTP/3 is also available since this version: https://nginx.org/en/docs/http/ngx_http_v3_module.html
It is simply activated in the same way !

It would kill two birds with one stone to add this support. 😉

[jcameron]

So did Nginx 1.25.1 introduce this change?

[iliajie]

Yes, HTTP/3 was introduced in Nginx 1.25.0.

[SIP-Online]

I confirm, and even active with the new HTTP/2 activation method:
nginx -V

nginx version: nginx/1.26.2
built with OpenSSL 3.0.13 30 Jan 2024
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -ffile-prefix-map=/build/nginx-1.26.2=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -Wdate-time -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -fPIC' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=stderr --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-compat --with-debug --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_v3_module --with-http_dav_module --with-http_slice_module --with-threads --with-http_addition_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_secure_link_module --with-http_sub_module --with-mail_ssl_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-stream_realip_module --with-http_geoip_module=dynamic --with-http_image_filter_module=dynamic --with-http_perl_module=dynamic --with-http_xslt_module=dynamic --with-mail=dynamic --with-stream=dynamic --with-stream_geoip_module=dynamic

[jcameron]

What I was wondering is which version added support for the http2 directive..

[SIP-Online]

This is from version 1.25.1 (paragraph: Deprecation of listen … http2 directive): https://www.f5.com/company/blog/nginx/nginx-plus-r30-released#Important-Changes-in-Behavior-

[willnode]

Hello, just heads up, it's giving warning already in NGINX 1.24, this version is available in Rocky Linux 9 (via stream modules).

https://serverfault.com/a/1131319/583113

One of solution is add http2 on; instead of adding http2 after listen directive. For myself I turned off http2 by default to remediate this warning.

[willnode]

@jcameron it's fairly new https://hg.nginx.org/nginx/rev/08ef02ad5c54 maybe need to detect nginx version?

[jcameron]

Yes, we'd need to add a check for the Nginx version.

I'm a little reluctant to implement this because it would make migration of Nginx configs between systems difficult..