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I've recently added a large database to my site but Google is not crawling any of the pages because they all return a 304 header, meaning that Google believes it's already cached the pages and doesn't need to do so again.
Unfortunately it hasn't crawled any of the pages ever and so there's large amounts of material not getting crawled. I am a tech newbie - please could someone explain how I can turn off the 304 code or at least change the "If Modified Since" date to a future time so that Google will be able to crawl the pages. This is urgent as I don't want to have to wait another 3 months for the next deep crawl, thx!