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# kill cache
add_header Last-Modified $date_gmt;
add_header Cache-Control 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
if_modified_since off;
expires off;
etag off;

# don't cache it
proxy_no_cache 1;
# even if cached, don't try to use it
proxy_cache_bypass 1;