I just want to know, what difference it will make when I post using LWP and WWW::Mechanize. Below is what I experimented, which triggers this question.

use strict;
use warnings;
use LWP::UserAgent;
use Data::Dumper;
my $url = "http://192.168.1.5/src/Login_validate.php";
my $mech = LWP::UserAgent->new();
my $response=$mech->post($url,[ 'name' => "username", 'passwd' => "pas
+sword"]);
if(!$response->is_success())
{
    print "Failiure\n";
}
print Dumper \$mech->get("http://192.168.1.5/src/allbooks.php");

__DATA__
In allbooks.php I checked 
if(isset($_SESSION['id']) and if not I print "Session expired" error m
+essage.

So when I executed the above code, it prints "Session expired" message
+.
[download]

use strict;
use warnings;
use WWW::Mechanize;
use Data::Dumper;

my $url = "http://192.168.1.5/src/Login_validate.php";
my $mech = WWW::Mechanize->new();
my $response=$mech->post($url,[ 'name' => "username", 'passwd' => "pas
+swd"]);
if(!$response->is_success())
{
   print "Failiure\n";
}
print Dumper \$mech->get("http://192.168.1.5/src/allbooks.php");

__END__
The above code print the html contents, echoed by allbooks.php and I'm
+ not getting the session expired message.
[download]

So can any one please explain why LWP and WWW::Mechanize works differently in my case?