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You only need to use vary header if you dynamically change the content for specific devices on the same URL depending on the user agent. You can see this outlined here: Google guide on Dynamic Serving If you use separate URLs for mobile you do not need to use the vary header. You should however tell Google the relationship between two URLs by tagging them ...


I read elsewhere that google chrome browser ignores cache-control sent by the server and uses a value of zero. Citation please? The only reference I found of this is a SO question (June 2012) that states that Chrome will override Cache-Control if the user specifically refreshes the page - which is understandable. This would also be strange since Google ...

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