anchor.diff:      {{response_header, string:to_lower(lists:reverse(Var))}, Col+2, Rest};
   parse_accesslog_var([$r,$e,$a,$l,$},$a|Rest], Col, []) ->
       {real_remote_ip, Col+6, Rest};
  +parse_accesslog_var([$r,$e,$a,$l,$},$h|Rest], Col, []) ->
  +    {real_remote_host, Col+6, Rest};
   parse_accesslog_var([C|Rest], Col, Var) ->
       parse_accesslog_var(Rest, Col+1, [C|Var]).
   
  
positive.code:     try
          Ip = yaws_logger_netutils:parse_ip(HostName),
          format_real_ip(Ip, InH, RevPx)
      catch
          _:_ ->
              HostName
  
negative.code:                  {Ip,_,_,OutH,_}=Data, Msg) ->
      Msg1 = case check_cond(Cond, OutH#outh.status) of
                 true  -> [format_host(Ip)|Msg];
                 false -> [$-|Msg]
             end,
      format_accesslog(Rest, ServerName, RevPx, Data, Msg1);
  format_accesslog([{real_remote_host, Cond}|Rest], ServerName, RevPx,
                   {Ip,_,InH,OutH,_}=Data, Msg) ->
      Msg1 = case check_cond(Cond, OutH#outh.status) of
                 true  -> [format_real_host(Ip,InH,RevPx)|Msg];
                 false -> [$-|Msg]
             end,
      format_accesslog(Rest, ServerName, RevPx, Data, Msg1);
  