Hello!

On Wed, May 16, 2018 at 10:08:23AM -0400, vedranf wrote:

> Hey,
>
>
> Maxim Dounin Wrote:
> -------------------------------------------------------
> > Hello!
> >
> > On Mon, May 14, 2018 at 01:22:46PM -0400, vedranf wrote:
> >
> > > There is a problem when nginx is configured to try to follow
> > redirects (301)
> > > from upstream server in order to cache responses being directed to,
> > rather
> > > than the short redirect itself. This worked in 1.12 and earlier
> > releases.
> > > Here is the simplified configuration I use and which used to work:
> > >
> >
> > From the incomplete configuration and debug log snippets you've
> > provided it looks like your problem if that requests previously
> > not cached now successfully extracted from cache.
> >
> > From the snippets you've provided it is not possible to conclude
> > if the previous behaviour was buggy and now fixed (and your
> > previous configuration worked due to a bug), or the new behaviour
> > is incorrect.
> >
> > There are at least some fixes in 1.13.x which might affect your
> > configuration. In particular, this fix in 1.13.6 might be
> > related:
> >
> > *) Bugfix: cache control headers were ignored when caching errors
> > intercepted by error_page.
>
> Right, this seems to be causing it. I was able to replicate it only when 3XX
> redirect had Cache-Control set. Please look at the minimal configuration at:
> https://pastebin.com/tSqH4YJt
> with 1.12 you always get 204 response from 127.0.0.1:8181, with 1.14 first
> response is 204, but the subsequent responses are 500 with invalid URL
> prefix in "" error because in the second attempt request never goes to
> upstream (perhaps it assumes file is supposed to be in cache) and the
> variable is empty.

Ok, thanks you for confirming. So your configuration relied on a
bug which is now fixed. An obvious workaround would be to disable
looking into Cache-Control / Expires headers using the
proxy_ignore_headers directive (http://nginx.org/r/proxy_ignore_headers),
so nginx will cache things only based on proxy_cache_valid.

--
Maxim Dounin
https://xkcd.com/1172/
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