Last-Modified HTTP header not just for feeds

[sergey.s.betke@…]

Wordpress write HTTP Last-Modified, ETag headers just for feeds (class-wp.php, send_headers). And support If-Modified HTTP request header just for feeds. Wordpress 3.3 doesn't support HTTP 1.1 Cache-Control header.
The best solution - support HTTP cache-control headers and for html output (full blog). But If-Modified HTTP request header (304 responces) for site support optionally (some not-ajaxed widgets and plugins will show wrong information without page reloading).

WordPress version

Latest WordPress files - 3.3-RC2-19567

patch for full support Last-Modified, ETag, If-Modified HTTP headers

First -- I'm just your average community member, no one important.

I have similar desires to expand this functionality, and I've also had issues with the current application. It's far too brute-force, assuming that the only (and that every) time the site is updated is when a post or a comment is posted, and that the entire site is affected by such a thing. Applying the existing logic to every request would be a serious mistake. I've created another ticket with a more complete discussion of the matter - #22742