perlquestion arc_of_descent <p> Greetings to All, <p> I asked this question in the chatterbox a couple of weeks back, but looks like this task is tougher than I thought. Hence I'm posting it here in the hopes it reaches a wider audience and of course, a solution. <p> I need to get the exact order in which the HTTP request headers were sent by the browser from within my CGI script. I need this to perform browser fingerprinting. <p> All the following don't seem to work <code> # %header will be in random order my $q = CGI->new; my %header = map { lc($_) => $q->http($_) } $q->http; # %ENV is in random order print Dumper \%ENV my $h = HTTP::Headers->new(%ENV); # this returns the headers in the recommended # "Good Practice" order. print Dumper $h->header_field_names; # this doesn't work as well print $h->as_string; </code> <p> You can check the order in which the request headers were sent using Firebug. <p> PHP's getfullheaders() works :( <p> Any help would be great. Perhaps some Apache module can help? I will be releasing code to this fingerprinting module to CPAN. <p> Thanks!