This is more of a high-level summary of this post:

But, I think it's a very important and often overlooked aspect of specifying canonical pages. That is, simply stripping any query string parameters from the URL, i.e.


<link rel="canonical" href="" />

What you are telling search engines with this tiny but dangerous tag is that all "versions" of the /products page are essentially duplicates of each other. Very bad!

A more appropriate use of canonicals is to "strip" query strings which don't actually affect page content. For instance:

<link rel="canonical" href="" />

This prevents the SE's from assuming that the page with the message query string parameter is actually a different page.


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