# Launch PhantomJs
    $options{ launch_exe } ||= 'phantomjs';
    (my $ghostdir_default= __FILE__) =~ s!\.pm$!!;
    $ghostdir_default= File::Spec->catfile( $ghostdir_default, 'ghostdriver', 'main.js' );
    $options{ launch_ghostdir } ||= $ghostdir_default;
    $options{ launch_arg } ||= [];
    push @{ $options{ launch_arg }}, "--PhantomJS=$options{ port }";
    push @{ $options{ launch_arg }}, "--logLevel=\U$options{ log }";
    my $cmd= "| $options{ launch_exe } $options{ launch_ghostdir } @{ $options{ launch_arg } }";
    #warn $cmd;
    $options{ pid } ||= open my $fh, $cmd
        or die "Couldn't launch [$cmd]: $! / $?";