use strict;
use WWW::Mechanize;
use Storable qw(store retrieve freeze thaw);

# init a mech instance
my $mech = WWW::Mechanize->new();

# on first instance...
if(! -f 'stored_mech.dat') {
    # create, get, freeze, and store
    $mech->get('http://localhost/mech-form.php');
    store([freeze($mech)], 'stored_mech.dat');
    exit;
}
# on subsequent instance...
else {
    # retrieve, thaw, and submit form
    my $stored = retrieve('stored_mech.dat');
    $mech = thaw($stored->[0]);
    $mech->submit_form(form_number=>1);
}

##</code><code>##

use strict;
use WWW::Mechanize;
use YAML qw(DumpFile LoadFile freeze thaw);

# init a mech instance
my $mech = WWW::Mechanize->new();

# on first instance...
if(! -f 'stored_mech.dat') {
    # get, freeze, and store
    $mech->get('http://localhost/mech-form.php');
    DumpFile('stored_mech.dat', [freeze($mech)]);
    exit;
}
# on subsequent instance...
else {
    # retrieve, thaw, and submit form
    my $stored = LoadFile('stored_mech.dat');
    $mech = thaw($stored->[0]);
    $mech->submit_form(form_number=>1);
}

##</code><code>##

Can't locate object method "scheme" via package "URI::http" at /usr/share/perl5/URI.pm line 52.

##</code><code>##

use strict;
use WWW::Mechanize;
use YAML qw(DumpFile LoadFile freeze thaw);

# init a mech instance
my $mech = WWW::Mechanize->new(cookie_jar => {ignore_discard => 0}); # save even browser-lifetime cookies

# on first instance...
if(! -f 'stored_mech.dat') {
    # get, freeze, save cookie jar, and store
    $mech->get('http://localhost/mech-form.php');
    $mech->cookie_jar->save('cookies.dat');
    DumpFile('stored_mech.dat', [freeze($mech)]);
    exit;
}
# on subsequent instance...
else {
    # retrieve, thaw
    my $stored = LoadFile('stored_mech.dat');
    $mech = thaw($stored->[0]);
    # re-get page and reload cookies
    $mech->get('http://localhost/mech-form.php');
    $mech->cookie_jar->clear();
    $mech->cookie_jar->load('cookies.dat');
    # submit form with (presumably) original session
    $mech->submit_form(form_number=>1);
}

##</code><code>##

use strict;
use WWW::Mechanize;
use YAML qw(DumpFile LoadFile freeze thaw);

# init a mech instance
my $mech = WWW::Mechanize->new(cookie_jar => {ignore_discard => 0}); # save even browser-lifetime cookies

# on first instance...
if(! -f 'stored_mech.dat') {
    # get, freeze, save cookie jar, and store
    $mech->get('http://localhost/mech-form.php');
    $mech->cookie_jar->save('cookies.dat');
    printf "Before freeze & save: \%s\n\n", $mech->response()->headers()->as_string();
    printf "Page session id: \%s\n\n", $mech->content();
    DumpFile('stored_mech.dat', [freeze($mech)]);
    exit;
}
# on subsequent instance...
else {
    # retrieve, thaw
    my $stored = LoadFile('stored_mech.dat');
    $mech = thaw($stored->[0]);
    # re-get page and reload cookies
    $mech->get('http://localhost/mech-form.php');
    $mech->cookie_jar->clear();
    $mech->cookie_jar->load('cookies.dat');
    # submit form with (presumably) original session
    $mech->submit_form(form_number=>1);
    printf "After thaw & submit: \%s\n", $mech->response()->headers()->as_string();
    printf "Page session id: \%s\n\n", $mech->content();
}

##</code><code>##

~$ perl ./mech-test.pl
Before freeze & save: Set-Cookie: PHPSESSID=p9ogedv2qf1r5h664la79is1j2; path=/

Page session id: p9ogedv2qf1r5h664la79is1j2 

~$ perl ./mech-test.pl
After thaw & submit: Set-Cookie: PHPSESSID=tq3devkvch2t5fsq6qbp707de4; path=/

Page session id: tq3devkvch2t5fsq6qbp707de4