#   ad-filtering).  For more information on Perl regular expressions, see
#   the Perl documentation.
# Note that most popup ads will be removed if scripts are removed (see
#   $REMOVE_SCRIPTS above).
# If ad-filtering is your primary motive, consider using one of the many
#   proxies that specialize in that.  The classic is from JunkBusters, at
#   http://www.junkbusters.com .

# Reject images whose URL matches any of these patterns.  This is just a
#   sample list; add more depending on which sites you visit.
@BANNED_IMAGE_URL_PATTERNS= (
    'ad\.doubleclick\.net/ad/',
    '\b[a-z](\d+)?\.doubleclick\.net(:\d*)?/',
    '\.imgis\.com\b',
    '\.adforce\.com\b',
    '\.avenuea\.com\b',
    '\.go\.com(:\d*)?/ad/',
    '\.eimg\.com\b',
    '\bexcite\.netscape\.com(:\d*)?/.*/promo/',
    '/excitenetscapepromos/',
    '\.yimg\.com(:\d*)?.*/promo/',
    '\bus\.yimg\.com/[a-z]/(\w\w)/\1',
    '\bus\.yimg\.com/[a-z]/\d-/',
    '\bpromotions\.yahoo\.com(:\d*)?/promotions/',
    '\bcnn\.com(:\d*)?/ads/',
    'ads\.msn\.com\b',
    '\blinkexchange\.com\b',
    '\badknowledge\.com\b',
    '/SmartBanner/',
    '\bdeja\.com/ads/',
    '\bimage\.pathfinder\.com/sponsors',
    'ads\.tripod\.com',
    'ar\.atwola\.com/image/',
    '\brealcities\.com/ads/',
    '\bnytimes\.com/ad[sx]/',
    '\busatoday\.com/sponsors/',
    '\busatoday\.com/RealMedia/ads/',
    '\bmsads\.net/ads/',
    '\bmediaplex\.com/ads/',
    '\batdmt\.com/[a-z]/',
    '\bview\.atdmt\.com/',
    '\bADSAdClient31\.dll\b',
    ) ;

# If set, replace banned images with 1x1 transparent GIF.  This also replaces
#   all images with the same if $TEXT_ONLY is set.
# Note that setting this makes the response a little slower, since the browser
#   must still retrieve the empty GIF.
$RETURN_EMPTY_GIF= 0 ;



# To use an external program to decide whether or not a user at a given IP
#   address may use this proxy (as opposed to using server configuration), set
#   $USER_IP_ADDRESS_TEST to either the name of a command-line program that
#   performs this test, or a queryable URL that performs this test (e.g. a CGI
#   script).
# For a command-line program:  The program should take a single argument, the
#   IP address of the user.  The output of the program is evaluated as a
#   number, and if the number is non-zero then the IP address of the user is
#   allowed; thus, the output is typically either "1" or "0".  Note that
#   depending on $ENV{PATH}, you may need to enter the path here explicitly.
# For a queryable URL:  Specify the start of the URL here (must begin with
#   "http://"), and the user's IP address will be appended.  For example, the
#   value here may contain a "?", thus putting the IP address in the
#   QUERY_STRING; it could also be in PATH_INFO.  The response body from the
#   URL should be a number like for a command line program, above.
$USER_IP_ADDRESS_TEST= '' ;


# To use an external program to decide whether or not a destination server is
#   allowed (as opposed to using @ALLOWED_SERVERS and @BANNED_SERVERS above),
#   set $DESTINATION_SERVER_TEST to either the name of a command-line program
#   that performs this test, or a queryable URL that performs this test (e.g. a
#   CGI script).
# For a command-line program: The program should take a single argument, the
#   destination server's name or IP address (depending on how the user enters
#   it).  The output of the program is evaluated as a number, and if the number
#   is non-zero then the destination server is allowed; thus, the output is
#   typically either "1" or "0".  Note that depending on $ENV{PATH}, you may
#   need to enter the path here explicitly.
# For a queryable URL: Specify the start of the URL here (must begin with
#   "http://"), and the destination server's name or IP address will be
#   appended.  For example, the value here may contain a "?", thus putting the
#   name or address in the QUERY_STRING; it could also be in PATH_INFO.  The
#   response body from the URL should be a number like for a command line
#   program, above.
$DESTINATION_SERVER_TEST= '' ;



# If either $INSERT_HTML or $INSERT_FILE is set, then that HTML text or the
#   contents of that named file (respectively) will be inserted into any HTML
#   page retrieved through this proxy.  $INSERT_HTML takes precedence over
#   $INSERT_FILE.
# When viewing a page with frames, a new top frame is created and the
#   insertions go there.
# NOTE:  Any HTML you insert should not have relative URLs in it!  The problem
#   is that there is no appropriate base URL to resolve them with.  So only use
#   absolute URLs in your insertion.  (If you use relative URLs anyway, then