Squid proxy acl

# TAG: reply_body_max_size    (KB)
#    This option specifies the maximum size of a reply body. It
#    can be used to prevent users from downloading very large files,
#    such as MP3's and movies.  The reply size is checked twice.
#    First when we get the reply headers, we check the
#    content-length value. If the content length value exists and
#    is larger than this parameter, the request is denied and the
#    user receives an error message that says "the request or reply
#    is too large." If there is no content-length, and the reply
#    size exceeds this limit, the client's connection is just closed
#    and they will receive a partial reply.
#
#    NOTE: downstream caches probably cannot detect a partial reply
#    if there is no content-length header, so they will cache
#    partial responses and give them out as hits. You should NOT
#    use this option if you have downstream caches.
#
#    If you set this parameter to zero (the default), there will be
#    no limit imposed.
#
#Default:
# reply_body_max_size 0