Adds the ETag, Last-Modified, Expires and Cache-Control headers to HTTP responses generated by WordPress to facilitate caching.
I think this is a great SEO find, it seems to be the only plugin accurately adding the last-modified header to the pages as detailed in the new webmaster guidelines. Remember, you cannot see the http header unless you use a tool for viewing http headers (just google it). Check out my site in the tool, you'll see the last modified and the etag - http://myfavoritwebdesigns.com
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