Any known gotchas with sending cookies?

[Daisuke Maki]

I'm really lost with this...

I'm trying to set a session cookie from PerlAccessHandler. I'm basically
doing (simplified code):

  my $cookie_jar = Apache::Cookie->fetch
  my $session_id = $cookie_jar->{ session }->value;

  if( !session_active( $session_id ) ) {
      my $session_obj = create_session_obj(); ## create and store new
session
      my $cookie      = Apache::Cookie->new(
          $r,
          -name    => 'session',
          -value   => $session_obj->id,
          -path    => '/',
          -domain  => 'my.domain.com',
          -expires => '+30m'
      );

      $r->headers_out->add( "Set-Cookie" => $cookie->as_string );
  }
  return DECLINED;

This works fine for the first access. Subsequently, I wipe out the
backend database to see if a new session is correctly created. A new
session is created as expected, but the problem is that the new cookie
does not seem to stick to the browser. I've verified that this doesn't
seem to be a browser issue, as I have problems with all browsers that I
have ( IE5.5, IE6, Mozilla 1.0rc)

Is there any known gotchas for this type of thing? Or am I missing
something?

TIA,
--d