How to insert Last-Modified HTTP-header in WordPress?

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The site doesn’t send Last-Modified header in its response.

I know I should insert somewhere something like header("Last-Modified: " . the_modified_date()); but where?

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  2. This worked for me on all posts – added into theme functions.php file:

    add_action('template_redirect', 'theme_add_last_modified_header');
function theme_add_last_modified_header($headers) {
    global $post;
    if(isset($post) && isset($post->post_modified)){
        $post_mod_date=date("D, d M Y H:i:s",strtotime($post->post_modified));
        header('Last-Modified: '.$post_mod_date.' GMT');
     }
}