How to send proxy cache status to backend server?

[Makailol Charls]

Hi,

I have been using add_header to send cache status to downstream server or
client like this. This is working fine.
add_header Cache-Status $upstream_cache_status;

Now I tried proxy_set_header to send header to upstream as below.
proxy_set_header Cache-Status $upstream_cache_status;

But this could not send headers to upstream backend server. I think we can
not use "$upstream_*"  variables to send headers to upstream backend.

Would you suggest me some way to send cache-status to backend upstream
server?

Thanks,
Makailol


On Fri, Mar 14, 2014 at 9:11 PM, Maxim Dounin <mdounin at mdounin.ru> wrote:

> Hello!
>
> On Fri, Mar 14, 2014 at 07:35:52PM +0530, Makailol Charls wrote:
>
> > Hello,
> >
> > I have been using proxy cache of Nginx. It provides response header to
> > indicate cache status. Is there some way to forward the cache status (in
> > case of miss, expired or revalidate ) to backend upstream server?
>
> The proxy_set_header directive should work, see
> http://nginx.org/r/proxy_set_header.
>
> --
> Maxim Dounin
> http://nginx.org/
>
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