How to use request headers in external_acl_type

"Yosi Greenfield" <ygreenfield@xxxxxxxxxxxxxx> · Fri, 25 Jun 2021 15:18:40 -0400

Hello 
all,

I'm trying to use 
request headers in an external acl, and I'm probably doing it incorrectly, and 
it's not working.

Here's my acl 
definiton:

external_acl_type ext_acl_program  %SRC 
%>{Connection} %>{Accept} %>{Custom_header} %>{Host} 
/etc/squid/ext_acl_program.pl

The program 
ext_acl_program.pl simply prints out the input

   chomp ($line);

@fields          = split(' ', 
$line);
   my $ip         
  = $fields[0];
   my $connection   = 
$fields[1];
   my $accept       = 
$fields[2];
   my $custom       = 
$fields[3];
   my $host       
  = $fields[4];

print LOGFILE  "IP: $ip\n Conn: $connection\n Accept: $accept\n Custom: 
$custom\n Host: $host";

The output looks like this:

IP: 
10.200.10.2
Conn: keep-alive
Accept: -
Custom: -
Host: www.wsws.com:443

As you see, 
it has values for %SRC, %>{Connection} and %>{Host}.  It does not 
have values for %>{Accept} and %>{Custom_header}

So the question is, are these %>{} substitutions 
coming from request_headers (as I thought)?

If yes, why does it only have Connection and Host, 
and not Accept or my custom header?

If they are not coming from request headers, where are 
they coming from?

And mostly, how can I pass my custom header into the 
program?

Thanks so much for your 
responses,
Yosi

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