Duplicate content can seriously harm your SEO, and
can even cause your website to be penalized by Google. Even if you remove the
possibility of duplicacy through manual actions, there are certain technical
issues that can lead to duplicate content.
These technical causes involve URL issues (www,
http, https etc are considered different even if they are point towards the
same page), different session Ids stored in the same URL, etc.
Here is how you can avoid duplicate content
through such issues -
301 redirect
Informs search engine which URL is the original
one, and links duplicate versions to it.
Domain
Set a preferred domain to avoid URL issues.
Rel=canonical
Informs the
search engine that the URL in question is the copy of original
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