Lighttpd

The following config fails if either of the two hosts is taken offline - I would expect lighttpd to remove the failed server from the pool? Perhaps we have misread the intention of the round-robin balancer?

$SERVER["socket"] == "0.0.0.0:90" {
        proxy.balance = "round-robin" 
        proxy.server = ("/" =>
                        ( "localhost" =>
                         ( "host" => "192.168.1.10", "port" => 81 ),
                         ( "host" => "192.168.1.11", "port" => 81 )
                        )
                       )

}