add proxy_cache_key

templates/vhost.conf.j2

@@ -53,6 +53,8 @@ server {
 		proxy_cache_lock                        on;
 		proxy_cache_use_stale                   error timeout http_500 http_502 http_503 http_504;
 		proxy_cache_background_update           on;
+		# use actual host instead of proxy host for cache key
+		proxy_cache_key 						$scheme$host$uri$is_args$args;
 		# for debugging purposes, add the following header
 		#add_header X-Cache-Status $upstream_cache_status;
 		{% else %}