proxy_cache_background_update after cache expiry

[Jean-Paul Hemelaar]

Hi,

I have a similar issue:
http://mailman.nginx.org/pipermail/nginx/2017-March/053198.html

I noticed (using tcpdump) that all data except the last package is send
immediately.
Can you verify it that's happening in your case as well?

JP

On Wed, Apr 5, 2017 at 1:32 PM, IgorR <nginx-forum at forum.nginx.org> wrote:

> Hello,
>
> I'm trying to configure nginx to use proxy_cache_background_update but it
> seems like after expiry it still waits for the full roundtrip to the
> backend, returning a MISS in X-Cache-Status. What am I MISSing?
>
> I'm using nginx 1.11.12 under ubuntu 14.04 running inside docker, but
> hopefully this is too much detail.
>
> location ~ ^/?(\d+/[^/]+)?/?$
> {
>    expires 20s;
>
>    proxy_cache app_cache;
>    proxy_cache_lock on;
>
>    proxy_cache_bypass $http_upgrade;
>
>    proxy_pass http://172.17.0.2:5000;
>    proxy_http_version 1.1;
>    error_log    /nginxerror.log debug;
>
>    add_header X-Cache-Status $upstream_cache_status;
>
>    proxy_cache_use_stale error timeout updating http_500 http_502 http_503
> http_504;
>    proxy_cache_background_update on;
>
>    break;
> }
>
> NB: This is a duplicate of my so question, I was kindly advised on the
> nginx
> IRC to repost here for better chances, the original question is here:
> http://stackoverflow.com/questions/43223993/nginx-
> proxy-cache-background-update-after-cache-expiry
>
> Posted at Nginx Forum: https://forum.nginx.org/read.
> php?2,273417,273417#msg-273417
>
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>
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