Question about proxy_cache_key

[Dewangga Bachrul Alam]

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Hello!

Thanks Francis, yes it's about 'Vary' header should be ignored on
proxy_ignore_headers.

Thanks for the hints.

On 02/16/2017 07:41 PM, Francis Daly wrote:
> On Thu, Feb 16, 2017 at 01:08:35PM +0700, Dewangga Bachrul Alam
> wrote:
> 
> Hi there,
> 
>> proxy_cache_key "$uri$is_args$args";
>> 
>> location / { proxy_ignore_headers Cache-Control Expires
>> Set-Cookie; rewrite (?<capt>.*) $capt?$args&view=$mobile break; 
>> }
> 
>> My question is, the URI 
>> https://subdomain.domain.tld/artikel/berita/a-pen-by-hair
>> accessed from another browser (eg. Safari) and cache status was
>> HIT, then I tried to invoke `PURGE` command from shell using
>> cURL, it was failed and return cache_key not found
> 
> I do not know the "fix"; but I suspect that the *reason* is due to
> the Vary header that is sent in the response.
> 
> If you know that "Vary" is not relevant in your case, then
> possibly temporarily adding it to proxy_ignore_headers will let you
> see whether that is related.
> 
>> The following argument "&view=desktop?" should be follow. Is
>> there any hints to match the proxy_cache_key? So I can purge the
>> cache anywhere and anytime?
> 
> I guess that the "view=desktop" part comes from your rewrite
> directive; it may take more documentation-digging to find the
> actual cache key that is used internally in nginx, so that the
> purge facility can work with it.
> 
> (Or possibly the ngx_cache_purge module could be updated to work 
> transparently with the current nginx cache key behaviour -- I do
> not know whether that is possible.)
> 
> Good luck with it,
> 
> f
> 
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