custom error handling logs 200 status?

[Nancy Lin]

Hi 

In the mod_perl eagle book, there's a section on writing customer error
handler (pg 173-174).  The example has two scripts.  The first one
GoFish.pm, basically returns a 500 status code and names Carp.pm as the
custom error handler.

I notice that if I take out the line:
            $r-custom_response(SERVER_ERROR, "/Carp");
and put in httpd.conf
        ErrorDocument 500 /Carp 

it'll work too (verified by telnet'ing to port).  However, the access_log
file will log a 500 status for the original code and a 200 status for the
other.  Why is that?

Nancy