‘301 Redirects Rules Change: What You Need to Know for SEO’ – MOZ
Cyrus Shepard says, “Is it time to rewrite the SEO playbooks?
For what seems like forever, SEOs have operated by a set of best practices that dictate how to best handle redirection of URLs. (This is the practice of pointing one URL to another. If you need a quick refresher, here’s a handy guide on HTTP status codes.)
These tried and true old-school rules included:
1. 301 redirects result in around a 15% loss of PageRank. Matt Cutts confirmed this in 2013 when he explained that a 301 loses the exact same amount of PageRank as a link from one page to another.
2. 302s don’t pass PageRank. By definition, 302s are temporary. So it makes sense for search engines to treat them different.
3. HTTPS migrations lose PageRank. This is because they typically involve lots of 301 redirects.
These represent big concerns for anyone who wants to change a URL, deal with an expired product page, or move an entire website”.
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