SEO Tip #95: How Should I Configure ‘If Modified Since’ On Database Driven Pages?
Matt Cutts: Great question, very specific, so let’s dive in. So for people who don’t know, suppose you have a static file, you can say “if modified since” in the http header is to say how essentially how old this file is. If it hasn’t been modified since 2007, Google doesn’t have to keep fetching it all the time or we can just check whether it has been updated and
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