There's a couple of things wrong here. The main one being that you're not actually starting the kernel (admittedly PoCo::Server::HTTPD's docs are lacking a bit in this respect). What you need to do is create a session and then start the kernel:

POE::Session->create(
  inline_states => {
    _start => \&create_httpd,
    _stop  => \&stop_httpd,
  },
  args => [8080],
);
$poe_kernel->run;

sub create_httpd {
  my ($kernel, $heap, $Port) = @_[KERNEL, HEAP, ARG0];
  $kernel->alias_set('httpd_parent');
  my $httpd = POE::Component::Server::HTTP->new
    (
     Port => $Port,
     ContentHandler => { '/' => \&MainHandler },
     Headers => {Server => 'any server' },
     );
  $heap->{httpd} = $httpd;
}

sub stop_httpd {
  my ($kernel, $heap) = @_[KERNEL, HEAP];
  $kernel->call($heap->{httpd}, 'shutdown');
}

sub MainHandler {
    my ($request, $response) = @_;

    $response->code(RC_OK);
    $response->content("Hi, you fetched ". $request->uri);
    return RC_OK;

} # MainHandler
[download]

The other thing wrong is a bug in PoCo::Server::HTTP - it uses the deprecated _signal event, but luckily for you it simply sets it to an empty sub, so you can comment that line out (just grep for _signal in the HTTP.pm file in the distro). (Note: I haven't tested the above code, so it might not work. But it should).

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