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Few topics confuse and scare webmasters more than site moves. To help you avoid surprises, we've created an in-depth guide on how to handle site moves in a Googlebot-friendly way. So what, exactly, is a site move and how do you go about moving a site correctly?
Basics of site moves
A site move is, broadly, one of two types of content migrations:
Site moves without URL changes. Only the underlying infrastructure serving the website is changed without any visible changes to the URL structure. For example, you might move www.example.com to a different hosting provider while keeping the same URLs and site structure on www.example.com.
Site moves with URL changes. Here, the URLs on the website change in any number of ways:
The protocol: http://www.example.com to [example.com...]
The domain name: example.com to example.net
The URL paths: http://example.com/page.php?id=1 to http://example.com/widget
Google Publishes an Updated Guide To Site Moves [googlewebmastercentral.blogspot.com]
I wonder why Google recommends using a 302 redirect if you're switching from m.site.com to responisive design on site.com.