Allow to use Vary and state-if-error headers.

For unknown reason, using disk cache does not support vary.
refresh-pattern has to be configured to use state-if-error.

slapos/recipe/squid/template/squid.conf.in

+refresh_pattern .   0 20% 4320 max-stale=604800
+
 # Dissallow cachemgr access
 http_access deny manager
 
 # Squid service configuration
-http_port %(ip)s:%(port)s accel vhost defaultsite=%(ip)s
-acl dest_domain dstdomain %(ip)s
-acl dest_addr dst %(ip)s
-acl dest_port port %(port)s
-http_access allow dest_addr dest_port dest_domain
-# Finally deny all other access to this proxy
-http_access deny all
-
-# Service to cache
+http_port %(ip)s:%(port)s accel defaultsite=%(ip)s
+
 cache_peer %(backend_ip)s parent %(backend_port)s 0 no-query originserver name=backend
-cache_peer_access backend allow dest_addr dest_port
+
+acl our_sites dstdomain %(ip)s
+http_access allow our_sites
+cache_peer_access backend allow our_sites
 cache_peer_access backend deny all
 
-# # Drop squid headers
+# Drop squid headers
 # via off
 # reply_header_access X-Cache-Lookup deny all
 # reply_header_access X-Squid-Error deny all
@@ -25,23 +23,10 @@ header_replace X-Forwarded-For
 follow_x_forwarded_for allow all
 forwarded_for on
 
-# Admin email
-# cache_mgr admin@example.org
-
 # Use 1Go of RAM
 cache_mem 1024 MB
 # But do not keep big object in RAM
 maximum_object_size_in_memory 2048 KB
-# Use the disk cache instead
-cache_dir ufs %(cache_path)s 2048 16 256
-coredump_dir %(cache_path)s
-
-# Everything is cacheable...
-minimum_object_size 0 KB
-# Except big ones!
-maximum_object_size 64096 KB
-
-cache_replacement_policy lru
 
 # Log
 access_log %(access_log_path)s