I found that multi-server implementation. It does not only use AnyEvent, it also relies on Coro to make switching between server loops easy when they get blocked. The code was developed under Windows, but the SSL problems alluded to above still apply.

#!perl -w
use strict;
use Coro;
use AnyEvent;
use AnyEvent::TLS;
use Plack::Handler::AnyEvent::HTTPD;

use Dancer ();
use App::Regexplain;
use Data::Dumper;

my %config = (
    'http' => { host => '127.0.0.1', port => 8080, protocol => 'http',
+ proto => 'tcp' },
    'https' => {
        host => '127.0.0.1',
        port => 8443,
        ssl => {
        cert_file => 'C:/Projekte/App-Regexplain/certs/testcert.pem',
        key_file => 'C:/Projekte/App-Regexplain/certs/testkey-nopass.p
+em',
    },
    },
);

=begin other_api

    __PACKAGE__->run(
        port  => [8080, "8443/ssl"],
        ipv   => '*', # IPv6 if available
        SSL_key_file  => '/my/key',
        SSL_cert_file => '/my/cert',
    );
    
=cut

for my $serverkey (sort keys %config) {
    my $config = $config{ $serverkey };
    
    my $runner = Plack::Runner::Multi->new;
    
    $runner->parse_options(
        '--server', 'AnyEvent::HTTPD',
        '-p', $config->{port},
        '-o', $config->{host},
        'bin\\app.pl',
    );
    
    if( $config->{ssl} ) {
        #$config->{ ssl } = AnyEvent::TLS->new(
        #    %{$config->{ ssl }}
        #);
    push @{$runner->{options}}, ssl => $config->{ssl}
    };
    
    my ($loader,$server,$app) = $runner->psgi_app();
    async {
        $loader->preload_app($app);
        $loader->run($server);
    };
};

# Kick off the event loop
AnyEvent->condvar->recv;

package Plack::Runner::Multi;
use strict;
use parent 'Plack::Runner';
use Coro;
use Data::Dumper;

# Paste from Plack::Runner::run except the $loader->run at the end
sub psgi_app {
    my $self = shift;

    #unless (ref $self) {
    #    $self = $self->new;
    #    $self->parse_options(@_);
    #    return $self->run;
    #}

    unless ($self->{options}) {
        $self->parse_options(@_);
    };

    my @args = @{$self->{argv}};

    $self->setup;

    my $app = $self->locate_app(@args);

    $ENV{PLACK_ENV} ||= $self->{env} || 'development';
    if ($ENV{PLACK_ENV} eq 'development') {
        $app = $self->prepare_devel($app);
    }

    if ($self->{access_log}) {
        open my $logfh, ">>", $self->{access_log}
            or die "open($self->{access_log}): $!";
        $logfh->autoflush(1);
        $app = $self->apply_middleware($app, 'AccessLog', logger => su
+b { $logfh->print( @_ ) });
    }

    my $loader = $self->loader;
    #warn "Loading Server with " . Dumper $self->{options};
    my $server = $self->load_server($loader);
    #$loader->preload_app($app);
    
    return ($loader, $server, $app);

    #$loader->run($server);
}

1;
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