maxjackie maxjackie - 28 days ago 4
Perl Question

How do I use Perl's LWP to log in to a web application?

I would like to write a script to login to a web application and then move to other parts
of the application:

use HTTP::Request::Common qw(POST);
use LWP::UserAgent;
use Data::Dumper;

$ua = LWP::UserAgent->new(keep_alive=>1);

my $req = POST "",
[ user_name => 'username',
user_password => "password",
module => 'Users',
action => 'Authenticate',
return_module => 'Users',
return_action => 'Login',

my $res = $ua->request($req);
print Dumper(\$res);
if ( $res->is_success ) {
print $res->as_string;

When I try this code I am not able to login to the application. The HTTP status code returned is 302 that is found, but with no data.

If I post username/password with all required things then it should return the home page of the application and keep the connection live to move other parts of the application.


You want WWW::Mechanize:

WWW::Mechanize, or Mech for short, is a Perl module for stateful programmatic web browsing, used for automating interaction with websites.

Features include:

  • All HTTP methods
  • High-level hyperlink and HTML form support, without having to parse HTML yourself
  • SSL support
  • Automatic cookies
  • Custom HTTP headers
  • Automatic handling of redirections
  • Proxies
  • HTTP authentication

Mech supports performing a sequence of page fetches including following links and submitting forms. Each fetched page is parsed and its links and forms are extracted. A link or a form can be selected, form fields can be filled and the next page can be fetched. Mech also stores a history of the URLs you've visited, which can be queried and revisited...