I want to redirect all links ending in “.html” to 410. I added the following line to .htaccess but it didn’t work:

RewriteRule ^.*.html$ - [R=410,L]

I also added the following code in 404.php for permanently redirecting missing pages to the homepage.

header("HTTP/1.1 301 Moved Permanently");
header("Location: ".get_bloginfo('url'));
exit();

What is the best way to achieve this?