Cache vs expires time

[Maxim Dounin]

Hello!

On Tue, Jan 08, 2019 at 09:55:30AM +0200, Andrei wrote:

> Is there a way to conditionally use proxy_ignore_headers? I'm trying to
> only ignore headers for requests which have $skip_cache = 0 for example

If you want different proxy_ignore_headers settings for 
different requests, you have to use different location{} blocks 
for these requests.  You can do so either by using distinct 
path-based locations, or by conditionally routing some requests to 
a different location (e.g., with the "rewrite" directive).

In the particular case of requests to /abc, consider something 
like this:

    location = /abc {
        proxy_pass ...
        proxy_cache ...
        proxy_ignore_headers Expires Cache-Control;
        proxy_cache_valid 5m;
    }

Note well that it makes little to no sense to only ignore Expires 
and Cache-Control on cached requests, since these headers are only 
used by nginx for caching.  If caching is not used, these headers 
are ignored anyway.  See http://nginx.org/r/proxy_ignore_headers 
for details.

-- 
Maxim Dounin
http://mdounin.ru/