Duplicate Content errors - not going away with canonical
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I am getting Duplicate Content Errors reported by Moz on search result pages due to parameters. I went through the document on resolving Duplicate Content errors and implemented the canonical solution to resolve it. The canonical in the header has been in place for a few weeks now and Moz is still showing the pages as Duplicate Content despite the canonical reference. Is this a Moz bug?
http://mathematica-mpr.com/news/?facet={81C018ED-CEB9-477D-AFCC-1E6989A1D6CF}
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The problem is that you are implementing a canonical from all those parametrized pages to http://mathematica-mpr.com/news/, and the content in that page -an empty result list- is not the same as in the original link you provide in your post -which show article results.
Canonical is used to show a preferred URL for a page, when there are two or more URLs which lead to the same content. After implementing the canonical, you have to make sure you are not linking to the "bad" url or it will never disappear from Google's SERP.
As your content is not the same on both pages, and the old URL is still accessible from your site, you are not fullfill the requirements to make those URL disappear.
I think that if you don't want those index to appear on the SERPs as depending on the search options it will lead to very common pages, and it is almost impossible to identify clearly a canonical reference for them, the best option is to add to robots.txt a line which blocks those parameters, and you will end with that problems.
Disallow: /news/?facet=*
This will remove your search results from the index, ending with duplication problems. Please make sure this is what you want, or if you prefer to keep those results although you continue having duplication issues.
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