I don't remember but my code is in the comment there in the previous link. But the original code might have changed. I modified the _mightNavigate sub, line 1585: https://github.com/Corion/WWW-Mechanize-Chrome/blob/d94c8f43a8c72efc994695e7c075dbc849b2c1e4/lib/WWW/Mechanize/Chrome.pm

Currently there is no way for the ->click method to avoid waiting on a HTTP response (or to recognize a standard way of no HTTP response). I'm planning to add a parameter that lets you basically send the click event and then continue, so you can manually wait for the event you want. But currently this is not conveniently solvable without resorting to ->eval of Javascript.

Actually, there already is an (undocumented) option that you can maybe use to avoid the forced waiting for an HTTP response. The option name is intrapage and it skips all that waiting. Actually determining whether all data has arrived is then up to you:

$mech->click( { intrapage => 1, selector => '#thatButton', single => 1
+ } );
[download]

#!/usr/bin/perl
# hash-bang / she-bang / sh-bang

use strict;
use warnings;
use Log::Log4perl ':easy';
use WWW::Mechanize::Chrome;
use open ':std', ':encoding(UTF-8)';

sub main ()
{
    my $mech;
    my $res;
    my $url;
     my $cookies;

    my $username;
    my $password;
    my $user;
    my $pass;
    my @formlist;

    $user = 'www';
    $pass = 'zzzz';
    $url = "https://www.instagram.com/accounts/login/?source=auth_swit
+cher&hl=en";

    $mech = WWW::Mechanize::Chrome->new(
            launch_exe => 'chromium',
            launch_arg => ["--no-sandbox", "--disable-setuid-sandbox",
+ "--remote-debugging-port=9222", "--headless"],
    );
    $mech->allow( javascript => 1 );

    $mech->get($url);
    if ($mech->success())
    {
        $mech->sleep(1);                                              
+      # waiting for load site
        $mech->form_number(1);

        $mech->value( username => $user );
        $mech->value( password => $pass );

        $mech->eval_in_page(<<'JS');
        var cls = document.getElementsByClassName('_0mzm- sqdOP  L3NKy
+       ');
        Array.prototype.forEach.call(cls, (item) => item.removeAttribu
+te('disabled'));
JS

        $mech->click({intrapage => 1, text => 'Log In', single => 1 })
+;
        $mech->sleep(2);

        print $mech->content;
    }
    else
    {
        print "Not connect to: ".$url."\r\n";
    }
    return 0;
}

main ();
[download]

Now i manually remove disable attribute from button, request send when i click Log in but get me error "The username you entered doesn't belong to an account. Please check your username and try again." when I'm definitely entering the correct data, it looks like he didn't see the login and password completed before sending, this error is probably displayed for an empty login. Anyone have any idea how to log in correctly?

My guess is that you need to simulate typing to get the form to respond properly.