trying to add rewrite rules, getting unexpected redirect.

I am adding a rewrite rule in the simplest way I know how, which is something like this:

function my_flush_rewrite_rules(){

	global $wp_rewrite;
	$wp_rewrite->flush_rules();

}

function my_add_rewrite_rule($wp_rewrite){

	$feed_rules = array(
		'.*myRequestedSpecialThing$' => 'index.php?my_parameter=1'
	);
	$wp_rewrite->rules = $feed_rules + $wp_rewrite->rules;

}

function my_add_query_vars($query_vars){

	$query_vars[] = 'my_parameter';
	return $query_vars;

}

function my_template_redirect(){

	global $wp_query;
	if(array_key_exists('my_parameter', $wp_query->query_vars)){
		do_my_special_stuff_here();
		die;
	}
}

add_action('init',						'my_flush_rewrite_rules');
add_action('generate_rewrite_rules',	'my_add_rewrite_rule');
add_filter('query_vars',				'my_add_query_vars');
add_action('template_redirect', 		'my_template_redirect');

but I am getting a redirect (301 Moved Permanently, which is basically just adding a trailing slash) that I do not want. Is this WordPress or something on my server?

Also is there a better or simpler way to work with WordPress rewrites?