$HTTP["host"] == "www.mydomain.com" {
proxy.server = (          
".htm" =>
      ((                 
        "host" => "127.0.0.1",                   
        "port" => 81                   
      )),                
".html" =>
      ((
        "host" => "127.0.0.1",
        "port" => 81
      ))

         )
}