and to tell browser to reload an object (and/or a page... everything on the site) only if is been modified since last visit time??? htaccess, httpd.conf... have you a ready directive right for my case? Thank You very much

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html5boilerplate.com includes a well commented .htaccess file that has many standard settings you should consider. Among them are reasonable settings for expiring the content.

Here's the documentation on mod_expires.

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