simpleHTTP flushing problem

Does anyone have experience with  POE::Component::Server::SimpleHTTP?

I need help in understanding how to flush my response immediately upon
calling $_[KERNEL]->call( 'HTTPD', 'DONE', $response );

Here are the two lines in question taken from my "sub GOT_REQ":

                $_[KERNEL]->call( 'HTTPD', 'DONE',
$response );
                $_[KERNEL]->post( 'PROCESS_XML',
'create_xml_response', $nf, $xml_request );

I need the "call" to occur immediately and send a 0 (ok) or 1 (error)
to the client. AND THEN AFTER continue to process the xml request in
another session called PROCESS_XML. However, the 0 or 1 is *not* being
sent out to the client until after the PROCESS_XML session finishes,
which can take more than a minute. Why doesn't call('HTTPD'...) output
right away?

Any help would be greatly appreciated.

sub GOT_REQ {
                # ARG0 = HTTP::Request object, ARG1 = HTTP::Response
object, ARG2 = the DIR that matched
                my( $request, $response, $dirmatch ) = @_[ ARG0 ..
ARG2 ];

                $response->code( 200 );

                my $xml_request =
&retrieve_multipart_content($request, $response);
                my $nf  = &parse_content( $xml_request );

                $response->content( $nf->{ReturnCode} );

                # We are done! For speed, you could use $_[KERNEL]-
>call( ... )
                $_[KERNEL]->call( 'HTTPD', 'DONE',
$response );
                $_[KERNEL]->post( 'PROCESS_XML',
'create_xml_response', $nf, $xml_request );
        }

Gil Vidals