A temporary redirect (302 or 307) tells browsers and Google that a page has moved for now and will come back. When the move is permanent, a 301 or 308 is the right signal.
With a temporary redirect, Google may keep the old address in its index and pass less value to the new one. That slows down a move and can leave the wrong address in the search results.
Snaglist lists every page that answers with 302 or 307, together with the address it redirects to.
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