nginx-1.23.0 changes draft

[Maxim Dounin]

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 at 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/