proxy_cache skynet; # cache name
proxy_cache_key $skylink_v1$path$arg_format$arg_attachment$arg_start$arg_end$http_range; # unique cache key
proxy_cache_min_uses 3; # cache after 3 uses
proxy_cache_valid 200 206 307 308 48h; # keep 200, 206, 307 and 308 responses valid for up to 2 days
add_header X-Proxy-Cache $upstream_cache_status; # add response header to indicate cache hits and misses

# bypass - this will bypass cache hit on request (status BYPASS)
# but still stores file in cache if cache conditions are met
proxy_cache_bypass $cookie_nocache $arg_nocache;

# no cache - this will ignore cache on request (status MISS)
# and does not store file in cache under no condition
set_if_empty $nocache "0";
proxy_no_cache $nocache;