Estimado Monjees

I am looking for guidance on how to connect to a server via secure websocket (wss) using perl, at as high level as possible, using a module preferably. My browser initiates this connection with this header Sec-WebSocket-Key: which is base64-encoded binary data. My interaction with it would be mostly reading what it periodically sends.

I have looked AnyEvent::WebSocket::Connection and Net::Async::WebSocket::Client but they do not mention wss. Am I wrong?

Whereas Mojo::UserAgent does support wss (it says), and allows for headers to be passed on but alas it fails. I used something like this:

use strict;
use warnings;

use Mojo::UserAgent;

my $URI = 'wss://echo.websocket.org';

my $ua  = Mojo::UserAgent->new;
my $tx = $ua->build_websocket_tx($URI);
$tx->req->headers->user_agent('Mozilla/5.0 (X11; Linux x86_64) AppleWe
+bKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36');

print $tx->req->headers->to_string."\n";

$ua->start(
  $tx => sub {
    my ($ua, $tx) = @_;
    print "Headers: ".$tx->req->headers->to_string."\n";
    print "WebSocket handshake failed!\n" and
        return unless $tx->is_websocket
    ;
    print "Got a handshake\n";
    $tx->on(message => sub {
        my ($ua, $msg) = @_;
        print "WebSocket message: $msg\n";
        $tx->finish;
    });
  }
);
print "waiting ...\n";
[download]

outputs this:

waiting ...
UA: Mojo::UserAgent
TX: Mojo::Transaction::HTTP
WebSocket handshake failed!
[download]

I am using a test site for the target (https://ws-playground.netlify.app/) which works on the browser and I have checked it does not need extra headers/cookies. But above code fails.

10min Edit: this works (nodejs client):

wscat -c wss://echo.websocket.org -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36'

this does not (waits...) :

curl -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36' 'wss://echo.websocket.org'

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