Cache only one specific query string pattern

[Palvelin Postmaster]

> On 25 Sep 2018, at 16:35, Palvelin Postmaster via nginx <nginx at nginx.org> wrote:
> 
> I use Wordpress’ REST API post feed to embed articles on an external site. My articles are updated fairly seldom, so there’s probably no need to dynamically compile every request response. I’m thinking of using fastcgi cache to cache the feed.
> 
> I’m currently skipping caching for all requests with a $query_string. However, the REST API URL’s also contain a query string and thus don’t currently get cached.
> 
> 	if ($query_string != "") {
> 		set $skip_cache 1;
> 	}
> 
> Is it possible to cache the REST API URL’s but skip cache for all other URL’s containing a $query_string?

In the absense of better suggestions, this seems to work. :)

# Wordpress-specific: URLs with a query string shouldn't be cached except when REST API
if ($request_uri ~ "^/wp-json/wp/v2/posts/.*") {
	set $cache_restapi "CACHE";
}

if ($query_string != "") {
	set $cache_restapi "${cache_restapi}NOT";
}

if ($cache_restapi = "NOT") {
	set $skip_cache 1;
}


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