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Serving the same content with and without capital letters (e.g., https://example.com/page/ and http://www.example.com/Page/) In these situations, the proper use of canonical tags is crucial. Furthermore, cross-domain duplicate content issues are also a thing.
Why are duplicate URLs not shown as canonical?
Duplicate, submitted URL not selected as canonical. This is also a case of a canonicalization signal (being submitted in a sitemap) being ignored. There is no explicitly marked canonical URL in this set of duplicate pages and in this case Google believes that another URL besides the one you submitted should be shown in the index.
When to use absolute or relative URLs for Canonical tags?
Canonical tags should be referenced using absolute URLs, rather than relative, to ensure that they are properly interpreted. That means you should be using:
Since Google may treat uppercase and lowercase URLs as two different URLs, you want to first make sure to force lowercase URLs on your server and then use lowercase URLs for your canonical tags. If you switched over to SSL, make sure that you don’t declare any non-SSL (i.e., HTTP) URLs in your canonical tags.
Which is the canonical URL in Google search?
A canonical URL is the URL of the page that Google thinks is most representative from a set of duplicate pages on your site. For example, if you have URLs for the same page (for example: example.com?dress=1234 and example.com/dresses/1234 ), Google chooses one as canonical.
Which is the canonical version of this page?
Here’s what each part of that code means in plain English: link rel=“canonical”: The link in this tag is the master (canonical) version of this page. href=“https://example.com/sample-page/”: The canonical version can be found at this URL.