fastcgi - Nginx Variable Cache Time -

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i'm working fastcgi_cache , wanted pass variable fastcgi_cache_valid have variable amount of cache time depending on file. seems not accept variable.

i tried following:

set $cache_time 15s; fastcgi_cache_valid 200 ${cache_time}; fastcgi_cache_valid 200 $cache_time;   set $cache_time "15s"; fastcgi_cache_valid 200 ${cache_time}; fastcgi_cache_valid 200 $cache_time;   set $cache_time 15; fastcgi_cache_valid 200 ${cache_time}s; fastcgi_cache_valid 200 $cache_time;

but receieved following errors:

nginx: [emerg] invalid time value "$cache_time" in /etc/nginx/conf.d/www.com.conf:118  nginx: [emerg] directive "fastcgi_cache_valid" not terminated ";" in /etc/nginx/conf.d/www.com.conf:118


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