Official Web Master Blog

Google is the world's largest search engine. It crawls millions of webpages everyday. But one problem it faces is duplicate URLs on a website linking to the same content. like example.com/blog and example.com/index.php?category=blog can point a same page, creating a duplicate content.
It is Important To Optimize Your URL Parameters to avoid duplication. Now Google Webmaster Tools give you a Configure URL Parameters feature, which will help Googlebot take recommended action to Crawl your site.

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