sub get_widget { my ($self, $params) = @_; unless (my_validation_function($params->{product_number})) { REST_error('404', 'Invalid product_number'); } my $widget = $widgets[$params->{product_number}]; if (REST_media_type eq 'text/plain') { return $self->plain_output($widget); } return $self->fancy_output($widget); }