Greetings to All,

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.

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.

All the following don't seem to work 


# %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;

[download]

You can check the order in which the request headers were sent using Firebug.

PHP's getfullheaders() works :(

Any help would be great. Perhaps some Apache module can help? I will be releasing code to this fingerprinting module to CPAN.

Thanks!

In reply to Get the order of HTTP request headers by arc_of_descent

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