$mech = WWW::Mechanize->new( autocheck  => 1 );
$mech->cookie_jar($cookie_jar);
$mech->default_header( 'User-Agent'      => 'Mozilla/5.0 <snip>' );
$mech->default_header( 'Referer'         => 'https://www.<snip>' );
$mech->default_header( 'Accept'          => 'application/<snip>' );
$mech->default_header( 'Accept-Language' => 'en-US,en;q=0.5' );
$mech->default_header( 'Accept-Encoding' => 'gzip, deflate' );
$mech->default_header( 'Connection'      => 'keep-alive' );
$mech->show_progress(1);