#hierarchy_stoplist cgi-bin ?	# 此行更改為下行
hierarchy_stoplist
  

#prefer_direct on    # 此行更改為下行
prefer_direct off
  

#prefer_direct off   # 此行更改為下行
prefer_direct on
  

在 squid-2.3.x 的 squid.conf 中：

#  TAG: prefer_direct
#       By default, if the ICP, HTCP, Cache Digest, etc. techniques
#       do not yield a parent cache, Squid gives higher preference
#       to forwarding the request direct to origin servers, rather
#       than selecting a parent cache anyway.
#
#       If you want Squid to give higher precedence to a parent
#       cache, instead of going direct, then turn this option off.
#prefer_direct on
  

#  TAG: prefer_direct
#       Normally Squid tries to use parents for most requests. If you by some
#       reason like it to first try going direct and only use a parent if
#       going direct fails then set this to off.
#
#       By combining nonhierarchical_direct off and prefer_direct on you
#       can set up Squid to use a parent as a backup path if going direct
#       fails.
#
#Default:
# prefer_direct off
  

acl SSL_ports port 443 563
acl Safe_ports port 80 21 443 563 70 210 1025-65535
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports