On Saturday 06 February 2016 12:13:52 Jim Ohlstein wrote:
> Hello,
>
> I am running a WordPress multisite install and recently turned off http2
> on the domain in order to use a third party module which evidently
> doesn't play nicely with http2 (echo module). In testing I noticed that
> the site was still being served with http2 enabled according to both
> Chrome and Firefox. I confirmed with curl.
>
> I recompiled nginx without any third party modules:
>
> # nginx -V
> nginx version: nginx/1.9.10
> built with OpenSSL 1.0.2f 28 Jan 2016
> TLS SNI support enabled
> configure arguments: --prefix=/usr/local/etc/nginx --with-cc-opt='-I
> /usr/local/include' --with-ld-opt='-L /usr/local/lib'
> --conf-path=/usr/local/etc/nginx/nginx.conf
> --sbin-path=/usr/local/sbin/nginx --pid-path=/var/run/nginx.pid
> --error-log-path=/var/log/nginx-error.log --user=www --group=www
> --with-file-aio --with-ipv6
> --http-client-body-temp-path=/var/tmp/nginx/client_body_temp
> --http-fastcgi-temp-path=/var/tmp/nginx/fastcgi_temp
> --http-proxy-temp-path=/var/tmp/nginx/proxy_temp
> --http-scgi-temp-path=/var/tmp/nginx/scgi_temp
> --http-uwsgi-temp-path=/var/tmp/nginx/uwsgi_temp
> --http-log-path=/var/log/nginx-access.log --with-http_stub_status_module
> --with-pcre --with-http_v2_module --with-http_ssl_module
>
>
> I then adjusted the config files so as not to reference any third party
> modules and performed a binary "upgrade".
>
> I still see that http2 is in use on both Chrome and Firefox, and also
> via curl.
>
> # curl -I -k https://my.ip4.add.ress/
> HTTP/2.0 302
> server:nginx/1.9.10
> date:Sat, 06 Feb 2016 16:49:44 GMT
> content-type:text/html; charset=UTF-8
>
> # curl -I https:/mydomain.net/
> HTTP/2.0 200
> server:nginx/1.9.10
> date:Sat, 06 Feb 2016 16:50:41 GMT
> content-type:text/html; charset=UTF-8
>
> There are other domains on that IPv4 which use http2. Disabling http2 on
> all of them resulted in the expected behavior in the browsers and in curl:
>
> # curl -I -k https:///my.ip4.add.ress/
> HTTP/1.1 302 Moved Temporarily
> Server: nginx/1.9.10
> Date: Sat, 06 Feb 2016 17:03:39 GMT
> Content-Type: text/html; charset=UTF-8
> Connection: keep-alive
>
> # curl -I https://mydomain.net/
> HTTP/1.1 200 OK
> Server: nginx/1.9.10
> Date: Sat, 06 Feb 2016 17:05:05 GMT
> Content-Type: text/html; charset=UTF-8
> Connection: keep-alive
>
> I don't see any reference to this at
> http://nginx.org/en/docs/http/ngx_http_v2_module.html so I am guessing
> this is unintended.
>
[..]

A quote from the documentation:

| The http2 parameter (1.9.5) configures the port to accept HTTP/2
| connections.

http://nginx.org/en/docs/http/ngx_http_core_module.html#listen

wbr, Valentin V. Bartenev

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