Hi all,

Was just playing around with some of the code in Sean M Burke's Perl and LWP (nice book, BTW) and encountered some unexpected behaviour with one of the examples from chapter three which uses $response->current_age(). Here's the program:

#!/usr/bin/perl
use warnings;
use strict;

use LWP;
my $browser = LWP::UserAgent->new();

my $response = $browser->get('http://www.perl.com/images/tabs/tab-perl
+blk.gif',
                            ':content_cb' => \&hex_dump,
                            ':read_size_hint' => 123,
                            );

print "Waiting a bit...\n";
sleep 10;

my $age = $response->current_age();
print "$age\n";                 # debug
my $days  = int($age/86400);
$age -= $days * 86400;
my $hours = int($age/3600);
$age -= $hours * 3600;
my $mins  = int($age/60);
$age -= $mins    * 60;
my $secs  = $age;
print "The document is $days days, $hours hours, $mins minutes, and $s
+ecs seconds old.\n";

sub hex_dump {
    my ($data, $response) = @_;
    print length($data), " bytes:\n";
    print '  ', unpack('H*', substr($data,0,16,'')),
         "\n" while length $data;
    return;
}

[download]

On my machine (SuSE Linux 8.0, Perl 5.6.1, LWP 5.66), this program outputs "The document is 0 days, 8 hours, 57 minutes, and 28 seconds old."

But according to the HTTP::Response man page, $response->current_age

calculates the "current age" of the response as specified by draft-ietf-http-v11-spec-07 section 13.2.3. The age of a response is the time since it was sent by the origin server. The returned value is a number representing the age in seconds.

I'm puzzled as to why this program does not say the document is 10 seconds old. The only thing I can think of is that the "current age" of the document (about 9 hrs) is roughly the same as the time difference between my location (Austria) and O'Reilly in CA. Could that be the reason, or is it something else entirely?

Thanks in advance, mooseboy

In reply to $response->current_age() behaving unexpectedly by mooseboy

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