Incorrect Canonical Links in Blogs

[sadams101]

An SEM Rush report is showing duplicate content issues on my site, and they are from the blogs. For example this page:

https://www.celiac.com/blogs/blog/1432-lynda-meadowss-blog/

and this page:

https://www.celiac.com/blogs/blog/1432-lynda-meadowss-blog/?cat=11

are identical, yet their canonical links are different. This should be the canonical link for both:

https://www.celiac.com/blogs/blog/1432-lynda-meadowss-blog/

There are many such pages which have been indexed, so I'm hoping for a fix that will correct the canonical link in such cases.

[Ryan Ashbrook]

This is kind of a difficult scenario - technically, they are in fact two different pages (and you can see this when you look at the View a category button on the right, above the entry list). The first one is the overall blog, which would show every single entry. The second is viewing a specific category within that blog, which would only show entries in that specific category.

If that user posted another entry within that blog, but in a different category, the issue would resolve itself because the first link would show both entries, whereas the second would continue to show just the one.

So then you have the opposite problem, in this scenario, with the canonical link pointing to the root blog while viewing a category, instead of pointing to the category itself.

[sadams101]

So the programming that creates the canonical link is not stripping off this when you view the article:

• ?cat=11

but of course it should, otherwise there will be duplicate content issues in Google and other SE's.

So you've described the problem, but what is the solution? A blog, just like an article, must have only one canonical link.