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Re: nginx-1.23.0 changes draft

Maxim Dounin
June 21, 2022 12:14PM
Hello!

On Tue, Jun 21, 2022 at 04:19:30PM +0300, Maxim Dounin wrote:

> Hello!
>
> On Tue, Jun 21, 2022 at 03:20:31PM +0400, Sergey Kandaurov wrote:
>
> > > On 21 Jun 2022, at 05:27, Maxim Dounin <mdounin@mdounin.ru> wrote:
> > >
> > > Changes with nginx 1.23.0 21 Jun 2022
> > >
> > > *) Change in internal API: now header lines are represented as linked
> > > lists.
> > >
> > > *) Change: now nginx combines arbitrary header lines with identical
> > > names when sending to FastCGI, SCGI, and uwsgi backends, in the
> > > $r->header_in() method of the ngx_http_perl_module, and during lookup
> > > of the "$http_...", "$sent_http_...", "$sent_trailer_...",
> > > "$upstream_http_...", and "$upstream_trailer_..." variables.
> > >
> > > *) Bugfix: if there were multiple "Vary" header lines in the backend
> > > response, nginx only used the last of them when caching.
> > >
> > > *) Bugfix: if there were multiple "WWW-Authenticate" header lines in the
> > > backend response and errors with code 401 were intercepted or the
> > > "auth_request" directive was used, nginx only sent the first of the
> > > header lines to the client.
> > >
> > > *) Change: the logging level of the "application data after close
> > > notify" SSL errors has been lowered from "crit" to "info".
> > >
> > > *) Bugfix: connections might hang if nginx was build on Linux 2.6.17 or
> > > newer, but was used on systems without EPOLLRDHUP support, notably
> > > with epoll emulation layers; the bug had appeared in 1.17.5.
> > > Thanks to Marcus Ball.
> >
> > Just wonder how such emulation layer is widespread enough to step on
> > the bug and to deserve an entry in changes, comparing to the bugfix for
> > "ignore long locked" alert with two cache managers that's not there.
>
> The "ignore long locked" alert is something caught with artificial
> stress testing and never reported in practice (or at least never
> attributed to the particular race condition). Further, there is
> no real issue, just a race condition which results in an unwanted
> alert. As such, I've skipped it as something minor, mostly
> internal and very unlikely to be seen by users. If you think it
> worth an entry I can add one though.
>
> The EPOLLRDHUP issue is a real one, which results in connection
> hangs. And, as far as I understand, it was observed by Marcus in a
> real world use case on DigitalOcean's App Platform. As such, it
> certainly deserves to be mentioned in CHANGES.
>
> > > *) Bugfix: nginx did not cache the response if the "Expires" response
> > > header line disabled caching, but following "Cache-Control" header
> > > line enabled caching.
> > >
> > >
> > > Изменения в nginx 1.23.0 21.06.2022
> > >
> > > *) Изменение во внутреннем API: теперь строки заголовков представлены
> > > связными списками.
> > >
> > > *) Изменение: теперь nginx объединяет произвольные строки заголовков с
> > > одинаковыми именами при отправке на FastCGI-, SCGI- и uwsgi- бэкенды,
> >
> > a stray space in "uwsgi- "?
>
> Yes, fixed, thnx.

Pushed to:

http://mdounin.ru/hg/nginx
http://mdounin.ru/hg/nginx.org

Release files as build by me:

http://mdounin.ru/temp/nginx-1.23.0.tar.gz
http://mdounin.ru/temp/nginx-1.23.0.tar.gz.asc
http://mdounin.ru/temp/nginx-1.23.0.zip
http://mdounin.ru/temp/nginx-1.23.0.zip.asc

--
Maxim Dounin
http://mdounin.ru/
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Subject Author Views Posted

nginx-1.23.0 changes draft

Maxim Dounin 94 June 20, 2022 09:30PM

Re: nginx-1.23.0 changes draft

Konstantin Pavlov 6 June 21, 2022 06:16AM

Re: nginx-1.23.0 changes draft

Maxim Dounin 5 June 21, 2022 08:58AM

Re: nginx-1.23.0 changes draft

Sergey Kandaurov 9 June 21, 2022 07:22AM

Re: nginx-1.23.0 changes draft

Maxim Dounin 8 June 21, 2022 09:20AM

Re: nginx-1.23.0 changes draft

Maxim Dounin 16 June 21, 2022 12:14PM



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