must also hide header so its not cached

config/nginx.sample.conf

@@ -167,6 +167,7 @@ server {
       # if Set-Cookie is in the response nothing gets cached
       # this is double bad cause we are not passing last modified in
       proxy_ignore_headers "Set-Cookie";
+      proxy_hide_header "Set-Cookie";
 
       # note x-accel-redirect can not be used with proxy_cache
       proxy_cache one;