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 "1";

# no cache - this will ignore cache on request (status MISS)
# and does not store file in cache under no condition
set $nocache "1";

# disable cache when nocache is set or skyd cache is enabled
proxy_no_cache $nocache;