subrequest->run() doesn't send HTTP headers

Hello list,


i'm trying to run a subrequest from within
a mod_perl content handler. The subrequest
is build from the request's 'lookup_file()'
method. Unfortunately, when i invoke the
'run()' method of the subrequest, no HTTP
headers are sent (even so the documentation
from 'Writing Apache Modules' claims that 'run()' 
  
                                  "... will do
  everything a response handler is supposed to, 
  including sending the HTTP headers and the 
  document body." 

  "... you must not send the HTTP header and 
  document body yourself ..."

Here's a short test case:

sub handler {
  my $req = shift;

  my $filename = "/tmp/sample.html";


  my $sub = $req->lookup_file($filename);
  $status = $sub->status;
  if($status == 200)
    {
      $ret = $sub->run;
    }
   return ret;
}

Furthermore, if the filename given to 'lookup_uri()'
points to a directory, $sub->status will return '200'
but '$sub->run()' will return '301' (which is o.k. since
the filename should end with a '/' ...).

Any ideas?

  Raf Mattes