  <Perl>
  {
    package MyMasonHandler_mywebsite;

    use vars qw(@ISA);
    push( @ISA, 'HTML::Mason::ApacheHandler' );

    my $ah = HTML::Mason::ApacheHandler->new(
        comp_root => "/home/mywebsite/html",
        data_dir => "/var/cache/mason/mywebsite",
        args_method => 'mod_perl',
    );

    sub handler {
        my ( $r ) = @_;

        # maybe set something here?
        # e.g. $r->param("sitename") = "mywebsite";

        $ah->handle_request( $r );
    }
  }
  </Perl>

  <VirtualHost *:80>
    ServerName mywebsite
    DocumentRoot /home/mywebsite/html
    
    <Files *.mhtml>
       SetHandler perl-script
       PerlHandler MyMasonHandler_mywebsite
    </Files>
  </VirtualHost>