sub show_form {
  my $c = shift ;
  my $status   = status() ;
  my $message  = get_message() ;
  my $page ;

  my %subst = ( _SERVICE_NAME_ => $service_name,
		_MESSAGE_      => $message,
		_STATUS_       => $status ) ;

  my $th = IO::File->new ;
  die "FATAL: Cannot open template file $template: $!"
    unless $th->open($template,'r') ;
  foreach my $line ($th->getlines) {
    $line =~ s/(_[A-Z_]+_)/$subst{$1}/g ;
    $page .= $line ;
  }
  $th->close ;

  reset_message ;
  my $resp = HTTP::Response->new ;
  $resp->content($page) ;
  $c->send_response($resp) ;
}